The 10-meter band was allocated on a worldwide basis by the International Radiotelegraph Conference in Washington, DC, on 4 October 1927. Its frequency allocation was then 28-30 MHz. A 300 kHz segment, from 29.700–30.000 MHz, was removed from the amateur radio allocation in 1947 by the International Radio Conference of Atlantic City.

Frequency Range and Allocation

The International Telecommunication Union recommends allowing amateur radio operations in the frequency range from 28.000–29.700 MHz, subject to member nations' individual regulation of radio. This 1.7 MHz allocation provides substantial bandwidth for various operating modes and activities within the amateur radio service.

Although 10 meters has a worldwide amateur radio allocation, in some countries the use of portions of 10 meters is allocated by the government by license class, by signal mode or signal bandwidth. Beyond these regulations there is also a general voluntary band plan adhered to by amateurs throughout the world.

International Band Plan Overview

The 10 meter band follows established international and regional band plans that organize spectrum usage. Morse code and other narrowband modes are found toward the bottom portion of the band, SSB from 28.300 MHz up, and wideband modes (AM and FM) are found near the upper part of the bottom portion of the band.

The most active part of the 10 meter band is probably 28.300–28.500 MHz. Worldwide, operation in this band segment is almost exclusively SSB. On SSB you'll find most activity between 28.400 and 28.500 MHz, with 28.450 - 28.500 MHz most favoured. With good conditions this spreads from 28.300 to above 28.600 MHz.

License Requirements and Privileges

Operating a 10-meter radio requires a valid amateur radio license, with different license classes having varying privileges on the band. Technicians may also operate on the 80, 40 and 15 meter bands using CW, and on the 10 meter band using CW, voice and digital modes.

American Novice and Technician class licensees were granted CW and SSB segments on the 10 meter band as of 21 March 1987. With the elimination of Morse code testing requirements for U.S. amateurs in February 2007, Technician-class licensees who have not passed a code test may operate with up to 200 Watts PEP using CW and SSB modes in a portion of the 10 meter band.

Unless otherwise noted, the maximum power output is 1500 watts PEP. Novice/Technicians are limited to 200 watts PEP on HF bands.

Band Characteristics and Unique Features

The 10 meter band possesses several unique characteristics that distinguish it from other amateur radio frequencies. 10 metres – 28.000–29.700 MHz – 10.71–10.08 m actual · Best long distance (e.g., across oceans) activity is during solar maximum; during periods of moderate solar activity the best activity is found at low latitudes.

10 meters (28.0-29.7 MHz) offers superb long distance contacts (DX) even on very low power (QRP). An antenna for ten meters is smaller and easier to build than for any other HF ham radio bands. In other words, here is a band on which you are likely to get the "biggest bang for the buck" than on any other HF band ... if you are looking for DX that is.

10 Meter Propagation Characteristics

Understanding propagation is crucial for successful 10 meter operations, as this band exhibits unique behavior dependent on solar activity and ionospheric conditions.

Skip Propagation and Ionospheric Effects

Due to its unique spot in the spectrum, 10 meters can occasionally be challenging to work. At peak times of the solar cycle when many sunspots appear on the Sun's surface, 10 meters can be alive with extremely long-distance signals, refracting from the F2 layer in the ionosphere. Generally speaking, the most effective and efficient propagation of 10-meter radio waves takes place during local daylight hours. During periods of increased sunspot activity, band openings may begin well before sunrise and continue into the night.

When there are more sunspots, the sun puts out radiation that charges particles in the earth's ionosphere. Radio waves bounce off of (refract from) these charged particles, and the denser these clouds of ions, the better the HF propagation. When the ionosphere is denser, higher frequencies will refract off it rather than passing through to outer space.

Solar Cycle Impact on 10 Meters

The actual cycle (black line) significantly exceeded the original forecast (dashed). We are now on the descending slope. Right now is a good time for amateur operators and shortwave broadcasters (and listeners), because the world is just coming off the peak, or solar maximum, of Solar Cycle 25.

This is why every 11 years or so when this activity is higher, 10 meters gets exciting. 10 meters is at a high enough frequency, right near the top of the HF spectrum, that radio waves propagate very efficiently when the sunspot count is high.

For example, from mid-1988 to mid-1992 during Cycle 22, the SSN stayed higher than 100. The 10-meter band was open then almost all day, every day, to some part of the world.

The higher HF bands (10m – 17m) will be most effective for skip propagation during the years near solar maximum, occurring on an 11-year cycle. Some of these higher HF bands may not be open during the lower activity portions of the solar cycle. The higher the band frequency, the greater the dependence on high solar activity for the band to open (for signals to be bent back to earth by the ionosphere).

Sporadic E Propagation

The band offers useful short to medium range groundwave propagation, day or night. Due to Sporadic E propagation during the late spring and most of the summer, regardless of sunspot numbers, afternoon short band openings into small geographic areas of up to 1,500 km (1,000 miles) occur. Sporadic E is caused by areas of intense ionization in the E layer of the ionosphere. The causes of sporadic E are not fully understood, but these "clouds" of ionization can provide short-term propagation from 17 metres all the way up to occasional 2 metre openings.

Other modes of propagation, such as sporadic E, may provide sky-wave propagation on the 6 and 10-meter bands, especially during the summer.

Best Times and Conditions for Operation

Because the propagation on 10 meters can vary drastically throughout the day, propagation beacons are very important to gauge the current conditions of the band. You can still find out if there is any activity elsewhere in the world by... - By monitoring 28.200 MHz for any sign of a beacon. The NCDXF/IARU International Beacon Project has 18 beacons scattered around the world. Each beacon transmits once every three minutes, 24 hours a day. The project's website gives details about the transmission schedule and what is transmitted, at what power.

Cycle descents are not cliffs. Historical cycles show that strong high-band conditions persist well into the declining years — Cycle 23, which peaked in 2001, was producing exceptional 10M and 6M events through 2004 and 2005. The rate of decline matters more than whether you're past peak. Near maximum, the bands were often open before you even sat down. Descending, you need to pay more attention to solar flux numbers, K-index, and propagation tools. The operators who stay active and watch conditions carefully will continue to work DX that occasional operators miss entirely.

Operating Modes on 10 Meters

Being a very wide band in HF terms, many different transmission modes can be found on 10 meters. A 10-meter radio supports several modes of operation, including SSB (Single Side Band), CW (Continuous Wave), AM (Amplitude Modulation), FM (Frequency Modulation), and digital modes such as RTTY (Radio Teletype), PSK31 (Phase Shift Keying), and FT8 (Franke-Taylor design, 8-FSK modulation).

SSB Voice Operations

The most popular mode for a 10-meter radio is Single Sideband (SSB). SSB is a voice mode that allows for clear, high-quality communication over long distances. Unlike AM, which is the other common voice mode used on 10-meter radios, SSB provides more power efficiency and better audio quality.

There are two SSB modes: upper sideband (USB) and lower sideband (LSB). USB is used for transmitting at frequencies above 10 MHz, so it's the mode used for phone calls in the 10-meter band.

Amateur radio operators with Novice or Technician licenses can use the frequency range from 28.3 MHz to 28.5 MHz for Phone (voice) communications. Amateur operators with General, Advanced, or Extra radio licenses can use the entire remainder of the 10-meter band, from 28.3 MHz to 29.7 MHz for Morse Code, Phone, or Image transmission.

CW and Digital Modes

At the bottom of the band, from 28.0 MHz to 28.3 MHz, communication is limited to Continuous Wave, or Morse Code. Continuous Wave requires a very narrow bandwidth at 150 Hz, so this section provides ample space for Morse Code communications.

Digital modes, such as PSK-31, are also allowed in the upper portion of the band, with 28.120 being a popular PSK-31 frequency. In addition to SSB, other modes that are popular on 10-meter radios include FM, CW (Morse code), and digital modes such as PSK31 and FT8. Some popular modes on the 10-meter band include SSB (single sideband), FM (frequency modulation), and various digital modes such as FT8 and PSK31.

FM Repeater Operations

For practical reasons of spectrum use the FCC restricts FM to the 10m and higher bands only [10m, 6m, 2m, 1.25m, 70cm, and shorter wavelength bands]. From 29.000 MHz to 29.700, The FM sub-band is usually channelized into repeater and simplex frequencies. The channels are commonly grouped into repeater inputs, simplex, and repeater output frequencies.

Repeater input frequencies: 29.510, 29.520, 29.530, 29.540, 29.550, 29.560, 29.570, 29.580 and 29.590 MHz. Repeater output frequencies: 29.610, 29.620, 29.630, 29.640, 29.650, 29.660, 29.670, 29.680 and 29.690 MHz. Common practice for 10-meter repeaters is to use a 100 kHz negative offset for repeater operation.

Contest and DX Operations

The 3.5, 7, 14, 21 and 28MHz bands are the bands where contests can be found. The 10 meter band is particularly active during major contests and DX operations when band conditions permit.

When 10 is open, it is pretty easy to work lots of people with almost any antenna. Any radio, even those that are low power, can work people on 10M when the sunspot cycle is cooperating.

10 Meter Antennas and Equipment

10 meter amateur radio antennas are designed specifically for the 28-29.7 MHz frequency range and offer unique advantages: Compact Size - Shorter wavelength allows for smaller, more manageable antennas · Excellent DX Performance - Superior long-distance communication during solar maximum · Versatile Propagation - Works well for both local and skip communication · High Gain Potential - Multi-element beams provide significant gain in compact packages · Easy Installation - Smaller size makes installation more feasible for most hams

Popular 10 Meter Antenna Designs

Several antenna designs work particularly]]>42Sun, 24 May 2026 11:04:03 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/70-centimeter-band-guide-complete-amateur-radio-uhf-frequencies-and-applications-r41/The 70 centimeter band, also commonly known as the 70cm band or 440 MHz band, represents one of amateur radio's most popular and versatile UHF frequency allocations. The 70-centimeter or 440 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio and amateur satellite use. The ITU amateur radio allocation is from 430 to 440 MHz; however, some countries, such as the United States, allocate hams 420 to 450 MHz.

The name "70 centimeter" derives from the approximate wavelength of radio waves in this frequency range. When calculating wavelength using the formula λ = c/f (where c is the speed of light and f is frequency), a frequency of 430 MHz produces a wavelength of approximately 70 centimeters. This physical characteristic directly influences antenna design, propagation characteristics, and practical applications of the band.

Frequency Range and Wavelength Calculations

Understanding the relationship between frequency and wavelength is crucial for 70cm operations. At 430 MHz, the wavelength is 69.8 centimeters, while at 450 MHz it's 66.7 centimeters. These calculations are essential for antenna design, as many amateur antennas are built using quarter-wave (approximately 17.5 cm) or half-wave (approximately 35 cm) elements.

ITU Regions and Band Allocations

In the United States and Trinidad and Tobago, the band ranges from 420 to 450 MHz with some geographical limitations. In Canada and Australia, the band is 430–450 MHz. In the UK and Ireland amateurs are allocated 430–440 MHz. These regional differences reflect local spectrum management policies and sharing arrangements with other radio services.

By international treaty between the US and Canada, operation in the portion of the band from 420 to 430 MHz is prohibited north of Line A, which runs just south of the Canada–US border from Washington state to Maine, and east of Line C, which runs from northeast to southeast Alaska. These restrictions protect radar systems and other government operations.

Primary and Secondary Allocations

Depending on the country the band is shared with other radio services (in United States with government radar systems such as PAVE PAWS). Amateur radio typically operates as a secondary user, meaning amateur stations must not cause harmful interference to primary services and must accept any interference from them.

FCC Regulations and Band Plan for 70cm

Just like the 2 Meter band, Technicians and higher class licensees have privileges across the entire 70 cm band, 420 to 450 MHz. The 70 cm band is BIG…providing 30 MHz of spectrum compared to only 4 MHz on 2 Meters. The FCC rules do not specify any mode restrictions on this band.

US Amateur Allocation (420-450 MHz)

The FCC has allocated 420 MHz to 450 MHz for amateur radio. This 30 MHz allocation represents one of the largest continuous amateur allocations in the radio spectrum, enabling numerous applications and operating modes.

Sub-band Designations and Uses

At the beginning of the band, we have a section dedicated to EME as well as ATV. Now this isn't for use with all terrain vehicles, this ATV is Fast-Scan Amateur TV. In addition to EME and ATV, there is space set aside for weak signal work as well as propagation beacons.

A good chunk of the 70 cm band is set aside for repeaters and simplex. As we saw with 2 meter, once again there are "channels" across this portion of the band. Repeater links will typically have a 12.5 kHz spacing while repeaters themselves and simplex is typically spaced at 25 kHz.

Power Limitations and Restrictions

Most amateur operations on 70cm are limited to 1,500 watts PEP, though practical considerations such as antenna gain restrictions near airports may apply. American radio amateurs may use a maximum of one watt of radiated RF power, on any ham frequency authorized for data emissions, to control RC models.

Coordination Requirements

The use of channels is especially important for repeaters, since they don't easily move around in frequency and are coordinated to minimize interference. Local frequency coordination councils manage repeater assignments to prevent interference between stations.

Radio Propagation Characteristics on 70cm

70-centimeter propagation characteristics lie midway between 2-meter and 33-centimeter (~900 MHz) bands. Above 200 MHz, as frequency increases, building penetration is reduced. Smaller obstacles may also block or reflect the signal. However, higher frequencies also present a lower noise floor, making it easier to overcome both natural and artificial interference, especially prevalent in urban environments.

Line-of-sight Propagation Patterns

The 70cm band primarily relies on line-of-sight propagation, with signals generally following optical paths between transmitter and receiver. A problem found with all UHF and higher frequencies is the prevalence of multipath signals. The reflective properties of the 70-centimeter band allow signals to be reflected by dense and solid material such as cement or rock. This creates a slight time delay between the primary and reflected signals, causing cancellations as direct and reflected signals are combined in the receiving antenna. This can cause receiving stations to experience rapid fluctuations in signal strength, or "picket fencing", when they are in motion.

Tropospheric Propagation Effects

432 MHz (70 Centimeters): This is where tropo gets exciting. Because the wavelength is shorter, 70cm signals are more easily trapped. It is very common for 70cm signals to be much stronger than 2m signals over the same path during a ducting event.

Strongest on UHF bands (432 MHz and above), but noticeable at 144 MHz as well. Can support 70 MHz contacts too, but less common due to the wavelength being more sensitive to terrain and atmospheric scattering. It's possible for a duct to form that only supports signal propagation at UHF, while not effectively passing anything in the VHF bands. Ducted signals from 1400 – 1600 km are fairly common, but it's more common for ducted signals to travel 800 – 1300km.

Urban and Terrain Impact Factors

High mountainous areas and undulating terrain between the transmitter and receiver can form an effective barrier to tropospheric signals. Ideally, a relatively flat land path between the transmitter and receiver is ideal for tropospheric ducting. Sea paths also tend to produce superior results.

Seasonal and Weather Influences

Such weather conditions can occur at any time, but generally the summer and autumn months are the best periods. In certain favourable locations, enhanced tropospheric propagation may enable reception of ultra high frequency (UHF) TV signals up to 1,000 miles (1,600 km) or more. The observable characteristics of such high-pressure systems are usually clear, cloudless days with little or no wind.

Common Applications and Operating Modes

Amateurs usually use the band for FM or digital voice communications through repeaters (useful for emergency communications), as well as narrow band modes (analog and digital) for long-distance communications (called "DX", including Moon bounce).

FM Repeater Operations

Large portions of the band are dedicated to FM operation, consistent with the popularity of the FM mode. There are portions of the band designated for repeater inputs and outputs. The standard repeater offset used on this band is 5 MHz. Plus or minus 5 MHz is a common repeater frequency offset in the 70 cm band in the USA. A split of 1.6 MHz is common elsewhere.

To use a 70 cm repeater, you'll need the frequency, the transmitter offset, and the tone. Frequencies are posted on various club websites as well as repeater directories. The offset will be either -5 MHz, or +5 MHz, depending on where it is located in the band.

Digital Modes (DMR, D-STAR, Fusion)

Looking at the current state of amateur radio, DMR has quickly become the go-to digital voice mode for many operators. The reason is simple – you can get started with DMR for around $100, yet still access advanced features typically found in $1000+ radios. While D-Star kicked off digital ham radio back in the early 2000s and Fusion joined the party in 2013, DMR's low cost has made it the clear favorite among hams getting into digital modes.

What it is: DMR is an open standard protocol used widely in commercial and public safety communication systems, and adapted for amateur radio. How it Works: DMR uses TDMA (Time Division Multiple Access) to allow for two simultaneous conversations on the same frequency, using time slots. It operates on the idea of talk groups that allow for wide groups of people to communicate on a shared channel.

What it is: D-STAR (Digital Smart Technologies for Amateur Radio) is an open-standard digital voice and data protocol developed by Icom. How it Works: D-Star uses a GMSK (Gaussian Minimum Shift Keying) modulation. It allows for digital voice communication, data transfer, and linking of repeaters. It uniquely utilizes a callsign-based routing system.

What it is: Yaesu System Fusion, also known as C4FM, is a proprietary digital voice mode developed by Yaesu. It's often marketed as a user-friendly digital option for new hams.

Packet Radio and APRS

The wide bandwidth available on 70cm makes it suitable for packet radio applications and APRS (Automatic Packet Reporting System) operations. The band supports both traditional 1200 baud packet and higher-speed data modes.

Weak Signal Communication

On the low end of the band, we see segments for some of the more exotic modes, starting with ATV, then Earth-Moon-Earth (EME) operation. EME operators communicate by bouncing their signals off the moon. Weak propagation mode allowing signals to travel 100–500 km. Caused by small-scale irregularities in the troposphere. Common across all these bands, but requires high power and gain (especially above 432 MHz). Used for beyond-line-of-sight links in commercial and military systems.

Emergency Communications Use

The 70cm band serves as an important emergency communications resource due to its wide bandwidth, numerous repeaters, and good building penetration characteristics compared to higher UHF bands. Many emergency services and ARES groups utilize 70cm for backup communications.

70cm Antennas and Equipment Setup

The relatively short wavelength of 70cm signals makes antenna systems compact and manageable while still providing excellent performance characteristics.

Antenna Types and Designs

UHF Yagi antenna is the most popular type of directional antenna in use today. The 9dBi 400-470Mhz Outdoor Yagi Antenna offers 58 degree Vertical and 40 degree Horizontal 3dB Beamwidth. Yagi antennas are particularly popular for 70cm applications due to their high gain and manageable size.

This high performance aluminum alloy dual band Yagi antenna is suitable for almost all Walkie-Talkies/Transceiver with frequency VHF/UHF. High Gain of the antenna can greatly enhance the reception and transmission capabilities for your device.

Mobile and Portable Antennas

Mobile 70cm antennas typically use quarter-wave whips or loaded shorter antennas. Lightweight,High strength,Waterproof,Corrosion resistant;good environmental adaptability. The body of the Yagi Antenna makes it highly resilient to outdoor use. Strong wind resistance,Rated wind velocity 60 m/s.

Base Station Antenna Systems

Base station antennas for 70cm range from simple ground plane antennas to high-gain multi-element Yagi arrays. Yagi, 70cm, 11 element, 5 ft. Boom, End Mount, Wideband 420-450 MHz, 13.4 dBi, 1 kW, N female, Each. Yagi, 70cm, 6 el., 3 ft. Boom., Rear Mt., 420-450 MHz, 11 dBi, 500 W, Gamma, SO-239, 3 lbs., Each.

SWR and Matching Considerations

Each of HYS Yagi antenna was tested and produced by professional analyzer to ensure the SWR less than 1.5. Proper impedance matching is crucial for 70cm antennas due to the higher frequencies involved, with SWR values below 2:1 generally acceptable for most applications.

Popular 70cm Ham Radio Equipment

Handheld Transceiver Recommendations

My opinion is the quality]]>41Sat, 23 May 2026 11:04:19 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/2-meter-band-complete-guide-frequencies-uses-and-equipment-for-amateur-radio-r40/The 2-meter amateur radio band is a portion of the VHF radio spectrum that comprises frequencies stretching from 144 MHz to 148 MHz in International Telecommunication Union region (ITU) Regions 2 (North and South America plus Hawaii) and 3 (Asia and Oceania) and from 144 MHz to 146 MHz in ITU Region 1 (Europe, Africa, and Russia). Frequencies between 30 and 300 MHz are referred to as Very High Frequency (VHF) region and those between 300 MHz and 3 GHz are referred to as Ultra High Frequency (UHF). The allocated bands for amateurs are many megahertz wide, allowing for high-fidelity audio transmission modes (FM) and very fast data transmission modes that are unfeasible for the kilohertz-wide allocations in the HF bands.

Because it is local and reliable, and because the licensing requirements to transmit on the 2-meter band are easy to meet in many parts of the world, this band is one of the most popular non-HF ham bands. The 2-meter band is often the band on which Ham radio operators make their first contacts. Obtaining a Ham operator's license consists of taking a simple test containing 35 questions covering such topics as operating procedures, rules and regulations and some minor electronics theory. There is no requirement to pass a Morse code test to be licensed to operate on the 2-meter amateur radio band.

Frequency Range and Allocation

In particular, the 2m band extends from 144 MHz to 148 MHz. The FCC Rules say that any mode (FM, AM, SSB, CW, etc.) can be used on the band from 144.100 to 148.000 MHz. The FCC has restricted 144.0 to 144.100 MHz to CW operation only. This restriction on the lower portion of the band allows for specialized weak signal operations and Earth-Moon-Earth (EME) communications that require the precision of CW modes.

When you're getting started as a Technician licensee, you have full access to all amateur frequencies above 50 MHz. Perhaps the most common band Tech's use is the 2 Meter band (144 MHz – 148 MHz). This makes the 2-meter band particularly attractive to new amateur radio operators who hold Technician class licenses, as it provides full privileges across the entire band without the frequency restrictions found in the HF bands.

VHF Band Characteristics and Properties

While "line of sight" propagation is a primary factor for range calculation, much of the interest in the bands above HF comes from use of other propagation modes. A signal transmitted on VHF from a hand-held portable will typically travel about 5–10 km (3–6 miles) depending on terrain. With a low power home station and a simple antenna, range would be around 50 km (30 miles). However, with proper equipment and techniques, much greater distances are possible.

With a large antenna system like a long yagi, and higher power (typically 100 watts or more) contacts of around 1 000 km (600 miles) using the Morse code (CW) and single-sideband (SSB) modes are common. The longest terrestrial contact ever reported on 2 metres (146 MHz) was between a station in Italy and a station in South Africa, a distance of 7 784 km (4 837 miles), using trans-equatorial anomalous enhancement (TE) of the ionosphere over the geomagnetic equator. This enhancement is known as TE, or trans-equatorial propagation and (usually) occurs at latitudes 2 500–3 000 km (1500–1900 miles) within either side of the equator.

2 Meter Band Frequency Allocations and Usage

The 2-meter band is divided into several sub-bands to organize different types of amateur radio activities and minimize interference between incompatible modes. Thus, it makes sense to have a band plan that divides the band up into segments for each type of operation. Understanding these allocations is crucial for proper band operation and avoiding interference with other users.

CW and Weak Signal Communications (144.0-144.1 MHz)

144.00-144.05 EME (CW) 144.05-144.10 General CW and weak signals The bottom 100 kHz of the 2-meter band is reserved exclusively for CW operations. At the very bottom of the 2 meter band, 144.000 to 144.100 is the CW portion, which includes Earth-Moon-Earth (EME) operation. EME operators communicate by bouncing their signals off the moon. This segment requires the most sensitive receiving equipment and highest antenna gains due to the extreme path losses involved in moonbounce communications.

SSB and Digital Modes (144.1-144.3 MHz)

144.10-144.20 EME and weak-signal SSB 144.200 National SSB calling frequency 144.200-144.275 General SSB operation 144.275-144.300 Propagation beacons The SSB calling frequency at 144.200 MHz serves as the primary meeting point for voice contacts using single sideband mode. This frequency is essential for weak signal work and long-distance VHF communications, including tropo, meteor scatter, and EME contacts.

Satellite and Experimental Modes (144.3-145.1 MHz)

144.30-144.50 New OSCAR subband 144.50-144.60 Linear translator inputs 144.60-144.90 FM repeater inputs 144.90-145.10 Weak signal and FM simplex This segment accommodates amateur satellite operations and experimental digital modes. The 2 meter band is also used in conjunction with the 70-centimeter band, or the 10-meter band and various microwave bands via orbiting amateur radio satellites. This is known as cross-band repeating.

Repeater Operations (145.1-146.0 MHz)

145.10-145.20 Linear translator outputs 145.20-145.50 FM repeater outputs 145.50-145.80 Miscellaneous and experimental modes 145.80-146.00 OSCAR subband The repeater segments are coordinated to prevent interference between adjacent repeater systems. When using a repeater, you just need to dial in the published repeater frequency and set the transmit offset, usually either + 600 kHz or – 600 kHz for a 2-meter band repeater. In some parts of North America, non-standard repeater offsets may be used, which will be indicated in the repeater directory.

Simplex Frequencies and Common Channels

Across all of North America, the National Simplex Frequency (also referred to as the calling frequency) is 146.52 MHz. 146.40-146.58 Simplex 146.400, 146.415, 146.430, 146.445, 146.460, 146.475, 146.490, 146.505 These simplex frequencies allow direct radio-to-radio communication without the use of repeaters.

In areas that use 15-kHz channels, the adjacent channels are 146.535, 146.550, 146.565 MHz, etc. moving upward. Below the calling frequency are 146.505, 146.490, 146.475 MHz and on. Choosing an appropriate simplex frequency can be a little tricky, since it depends on whether your region uses the 15-kHz or 20-kHz channel spacing. In areas that use 15-kHz channels, the adjacent channels are 146.535, 146.550, 146.565 MHz, etc. Below the calling frequency are 146.505, 146.490, 146.475 MHz and on. In areas that use 20 kHz channels, the frequencies are 146.540, 146.560, 146.580 MHz moving up and 146.500, 146.480, 146.460 MHz moving down.

Propagation Characteristics of 2 Meters

Understanding VHF propagation is essential for maximizing the potential of the 2-meter band. While line-of-sight propagation dominates most VHF communications, several propagation modes can extend communication distances far beyond normal ranges.

Line-of-Sight Propagation Basics

On VHF frequencies such as 2-meters, antenna height greatly influences how far one can talk. Typical reliable repeater range is about 25 miles (40 km). Some repeaters in unusually high locations, such as skyscrapers or mountain tops, can be usable as far out as 75 miles (121 km). Reliable range is very dependent on the height of the repeater antenna and also on the height and surroundings of the handheld or mobile unit attempting to access to the repeater.

Tropospheric Propagation and Ducting

Occasionally, signal bending in the atmosphere's troposphere known as tropospheric ducting can allow 2-meter signals to carry hundreds or even thousands of miles as evidenced by the occasional 2-meter contact between the west coast of the United States and the Hawaiian Islands, the northeast region to the Florida coast and across the Gulf of Mexico. These "Openings" as they are known, are generally first spotted by amateurs operating SSB and CW modes since amateurs using these modes are always alert for ducting or signal enhancement events.

Meteor Scatter Communications

Meteor scatter is an exciting propagation mode that allows amateur radio operators to make long-distance contacts using VHF and UHF frequencies. With the right equipment and software, it is possible to make contacts hundreds or even thousands of miles away. Meteor scatter works by bouncing radio signals off the ionized trails left by meteors. These trails are created when the meteor enters the Earth's atmosphere, and they typically last for less than a second. The ionized trails are created by the meteor's heat, which vaporizes the surrounding atmosphere, leaving behind a trail of ionized particles.

Among the options given (VHF, UHF, HF, and 2 meters), the most appropriate band is the VHF band, specifically the 2-meter band. This band is commonly used for amateur radio communications to exploit the ionized trails of meteors for brief periods of intense signal propagation. Working meteor scatter (MS) on 144 MHz (2 meters) is a fascinating part of VHF amateur radio that uses ionized trails left by meteors in the upper atmosphere to reflect radio signals over distances typically between 500 to 2,300 km.

EME (Earth-Moon-Earth) Operations

Communicating over great distances via VHF continues to fascinate many amateurs. EME (Earth-Moon-Earth) communication, also known as "moonbounce" and meteor scatter are two well known propagation techniques. The concept is simple: use the moon or the ionized trail of a meteor as a passive reflector to go way beyond line of sight. With a total path length of about 500,000 miles, EME is the ultimate DX!

To communicate over the longest distances, hams use moon bounce. VHF signals normally escape the Earth's atmosphere, so using the moon as a target is quite practical. Due to the distance involved and the very high path loss getting a readable signal bounced off the moon involves high power ~1,000 watts and steerable high gain antennas.

Sporadic E Skip and VHF Contests

Another VHF propagation event called, Sporadic E propagation; is a phenomenon involving radio reflections that can provide unexpected long-distance communications on 2 meters. Meteor scatter, sporadic E, and tropospheric ducting are the most common forms of VHF signal enhancement and are described further below. These propagation modes are particularly important during VHF contests when operators actively seek enhanced propagation conditions.

Popular Uses and Applications

The 2-meter band supports a wide variety of amateur radio activities, making it one of the most versatile bands available to amateur operators. Its popularity stems from both its accessibility to new operators and its diverse applications.

Local Repeater Communications

Much of 2-meter FM operation uses a radio repeater, a radio receiver and transmitter that instantly retransmits a received signal on a separate frequency. Repeaters are normally located in high locations such as a tall building or a hill top overlooking expanses of territory. Much of 2-meter FM operations use radio repeaters, which consist of a radio receiver and transmitter that instantly retransmits a received signal on a separate frequency. Repeaters are normally located in high locations such as a tall building or a hilltop overlooking expanses of territory.

Repeater communications form the backbone of local amateur radio activity, providing reliable communication coverage across metropolitan areas and rural regions. Local repeaters often host nets for emergency preparedness, technical discussions, and social interaction among amateur radio operators.

Emergency and Public Service

This popularity, the compact size of needed radios and antennas, and this band's ability to provide easy reliable local communications also means that it is also the most used band for local emergency communications efforts, such as providing communications between Red Cross shelters and local authorities.]]>40Fri, 22 May 2026 11:04:01 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/uhf-band-plan-for-ham-radio-complete-frequency-allocation-guide-r39/The UHF amateur radio allocation extends from 430 to 440 MHz internationally, however, some countries, such as the United States, allocate hams 420 to 450 MHz. Technicians and higher class licensees have privileges across the entire 70 cm band, 420 to 450 MHz. The 70 cm band is BIG…providing 30 MHz of spectrum compared to only 4 MHz on 2 Meters.

The 70-centimeter or 440 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio and amateur satellite use. This band is commonly referred to as the "70 centimeter" band because the wavelength at 440 MHz is approximately 70 centimeters. In the United States, the band extends from 420.0 to 450.0 MHz with geographical and power restrictions that may apply to all bands above 420 MHz.

Primary and Secondary Allocations

The band is shared with other radio services in the United States with government radar systems such as PAVE PAWS. Amateur operators are permitted to use up to 1500 Watts PEP maximum on VHF and higher bands. The FCC rules do not specify any mode restrictions on this band.

International vs US Band Plans

In the United States and Trinidad and Tobago, the band ranges from 420 to 450 MHz with some geographical limitations. In Canada and Australia, the band is 430–450 MHz. In the UK and Ireland amateurs are allocated 430–440 MHz.

By international treaty between the US and Canada, operation in the portion of the band from 420 to 430 MHz is prohibited north of Line A, which runs just south of the Canada–US border from Washington state to Maine, and east of Line C, which runs from northeast to southeast Alaska.

UHF Band Segments and Allocations

420-430 MHz Segment Breakdown

There is a restriction on operating below 430 MHz if you are close to the US border with Canada. This is the so-called Line A Restriction. Most hams will not be operating below 430 MHz unless they are using Amateur Television.

According to the ARRL band plan, the 420-430 MHz segment is primarily designated for Amateur Television (ATV) operations, including ATV repeater or simplex, control links, and experimental activities. This segment provides excellent bandwidth for fast-scan television transmissions.

430-440 MHz Frequency Uses

The 430-440 MHz segment contains several specialized sub-bands that support various weak signal and experimental applications. On the low end of the band, we see segments for some of the more exotic modes, starting with ATV, then Earth-Moon-Earth (EME) operation.

Key allocations in this segment include:

• 430.00-432.00 MHz: ATV simplex operations
• 432.00-432.07 MHz: EME (Earth-Moon-Earth) communications
• 432.07-432.08 MHz: Propagation beacons
• 432.08-432.10 MHz: Weak signal CW operations
• 432.100 MHz: SSB calling frequency
• 432.10-432.125 MHz: Mixed mode and weak signal operations
• 432.125-432.175 MHz: OSCAR satellite inputs
• 432.175-433.00 MHz: Mixed mode and weak signal operations
• 433.00-435.00 MHz: Auxiliary/repeater links
• 435.00-438.00 MHz: Satellite only operations

440-450 MHz Repeater Coordination

There are portions of the band designated for repeater inputs and outputs. The standard repeater offset used on this band is 5 MHz. On the UHF band (440–450 MHz), the standard offset is 5.000 MHz.

Some areas of the country use + 5 MHz offset while others use – 5 MHz. Within any region, the offset will be usually be the same on all repeaters. This means that in some parts of the country, you'll dial in the repeater output frequency in the range of 442 to 445 MHz and select a +5 MHz offset. In other areas, you'll dial in a repeater output frequency in the range of 447 to 450 MHz and select a -5 MHz offset.

Repeater outputs will always be between 440 and 445 MHz and always a plus offset (your radio transmits 445 to 449.975). The UHF offset is 5 MHz. However, regional variations exist, with repeaters on or above 445MHz typically using a - 5MHz offset and those below 445MHz using a + 5MHz offset for the standard offsets.

Weak Signal and Experimental Segments

The UHF band provides excellent opportunities for weak signal communications and experimental work. Narrow-band modes with a maximum bandwidth of 2.7 kHz are always located at the low frequency end of any VHF or UHF allocation. This is where you will find Morse (CW), telephony (SSB) and machine generated mode (MGM) activity such as JT65C and FSK441. In addition to the separate CW sub-band this is the area of the 432MHz band where operators make long-distance (DX) contacts.

FCC Regulations for UHF Operations

Power Limitations and Restrictions

Amateur stations must use the minimum transmitter power necessary to carry out the desired communications. No station may transmit with a transmitter power exceeding 1.5 kW PEP. For UHF operations specifically, technician licensees may use up to 1500 Watts PEP on the VHF and higher bands.

Geographical and power restrictions may apply to all bands above 420 MHz. For information about your area, see FCC 97.303 Frequency sharing requirements.

Bandwidth Requirements

Current FCC regulations specify different bandwidth limitations for various portions of the UHF band. In the 70 centimeter (420–450 MHz) bands, the specified digital codes may be used with a bandwidth not exceeding 100 kilohertz. The NPRM did not seek comment on eliminating the baud rate limit in the VHF or UHF bands allocated for amateur radio service.

Coordination Procedures

While the ARRL band plan sets the guidelines for band use across the US, VHF and UHF band plans are really defined on a statewide or regional basis. This means it is best to find the specific band plan for your region. The answer regarding coordination is going to vary based on local area coordinating council policy.

Local frequency coordination bodies manage repeater assignments and interference prevention. These areas sometimes use their own unique offsets, referred to as an 'odd split'. You could check your local coordinator's site to find out whether they're using a plus or minus offset.

Part 97 Compliance Requirements

It is good amateur practice to follow the band plan established by the Amateur Radio community. The band plan is developed so that spectrum allocated for our use is used most effectively. While band plans are not legally binding, they represent best practices for efficient spectrum utilization and interference prevention.

UHF Repeater Coordination and Planning

Repeater Frequency Pairs

FM operation is "channelized", meaning that specific 70 cm FM frequencies are identified by the band plan. The use of channels is especially important for repeaters, since they don't easily move around in frequency and are coordinated to minimize interference. The idea is to have all stations use frequencies that are spaced just far enough apart to accommodate the signal without interfering with the adjacent channels.

Most new radios default to 25 kHz channel steps, which is correct for Northern California UHF repeaters. However, Southern California UHF repeaters use 20 kHz channel spacing. If you're trying to land on a frequency like 448.060 MHz, you'll need to switch to 5 kHz or 20 kHz steps.

Input and Output Offsets

In most parts of the US, the standard offset is 5 MHz on the 70cm band, and can be either in the positive (+) or negative (-) direction. Your repeater directory will list the offset and direction.

In Colorado, the transmit offset on 440 MHz repeaters is – 5 MHz (that is, the repeater input frequency is 5 MHz below the output frequency.) However, it's +5 MHz below 446, above that it's - 5 MHz. 446.000MHz is the Call channel and is not paired.

Coordination Body Requirements

VHF/UHF band plans are managed regionally, so if you are not in Colorado check with your local repeater coordinating body. These organizations maintain databases of coordinated repeaters and manage interference resolution.

CTCSS tones may be assigned, and their use will be required, on 440, 902, 1240 MHz and above. A change was made in Policy 14.G requiring the mandatory assignment and use of CTCSS tones for repeaters operating on 440, 902, 1240 MHz, and above.

Interference Prevention Strategies

Proper coordination prevents interference between repeater systems and other users. The spacing between channels needs to account for the fact that a typical FM signal occupies a bandwidth that is about 16 kHz wide. This is why standard channel spacing is 25 kHz rather than the 5 kHz tuning steps common on most radios.

CTCSS stands for Continuous Tone Coded Squelch System. It is a sub-audible tone transmitted along with your voice signal that tells the repeater you are an authorized user. Without the correct tone, the repeater will not open up for you.

UHF Propagation Characteristics

Line-of-Sight Communication

70-centimeter propagation characteristics lie midway between 2-meter and 33-centimeter bands. Above 200 MHz, as frequency increases, building penetration is reduced. Smaller obstacles may also block or reflect the signal. However, higher frequencies also present a lower noise floor, making it easier to overcome both natural and artificial interference, especially prevalent in urban environments.

There is a misconception that VHF and up are line of sight only. This is incorrect. Only a modest setup is required to do 150+ miles any time day or night especially on the 144 MHz, 222MHz, and 432MHz bands.

Atmospheric Effects on UHF

Very often, in North Texas, the band will open up with enhanced propagation which allow even greater distances. Several times per year, it is possible to communicate from North Texas to Louisiana, Mississippi, Alabama, Georgia, and Florida. Once in a while, a massive opening occurs where contacts were made up toward all of New England.

Higher frequencies don't benefit from ionospheric effects, and generally don't propagate beyond direct line-of-sight. But in rare circumstances, atmospheric refraction can cause high-frequency radio signals to propagate much farther than normal.

Terrain and Building Impacts

A problem found with all UHF and higher frequencies is the prevalence of multipath signals. The reflective properties of the 70-centimeter band allow signals to be reflected by dense and solid material such as cement or rock. This creates a slight time delay between the primary and reflected signals, causing cancellations as direct and reflected signals are combined in the receiving antenna. This can cause receiving stations to experience rapid fluctuations in signal strength, or "picket fencing", when they are in motion.

Seasonal Propagation Variations

The amateur six metre (50 MHz) band sometimes provides intercontinental communication, while enhanced conditions on the higher bands (particularly during the summer) allows distances of thousands of kilometres to be covered. While 70 centimeters doesn't experience the same dramatic seasonal variations as lower frequencies, enhanced propagation conditions do occur more frequently during summer months.

Equipment and Antenna Considerations

UHF Transceiver Selection

Basic FM mobile or handheld transceivers usually tune the entire 70 cm band from 420 MHz to 450 MHz in 5 kHz steps. 70 centimeters is a popular ham band due to the ready availability of equipment in both new]]>39Thu, 21 May 2026 11:05:15 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/complete-hf-band-plan-guide-for-amateur-radio-operators-r38/The HF band plan serves as the essential roadmap for amateur radio operators navigating high-frequency spectrum from 3 to 30 MHz. The International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions, and the modes and types of allocations within each frequency band is called a bandplan; it may be determined by regulation, but most typically is set by agreements between amateur radio operators.

Understanding band plans is fundamental to effective HF operation. These plans are not just guidelines but are essential for maintaining order and preventing interference on the airwaves. They ensure that all operators, regardless of their license class, can coexist harmoniously and make the most out of the shared resource that is the radio spectrum.

ITU Regions and Global Coordination

Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio. The three ITU regions each have slightly different allocations:

• ITU Region 1: Europe, Africa, and northern Asia
• ITU Region 2: The Americas (North and South America)
• ITU Region 3: South and east Asia and the eastern Pacific

The 80 meter or 3.5 MHz band is a span of radio frequencies allocated for amateur use, from 3.5–4.0 MHz in North and South America (IARU and ITU Region 2); generally 3.5–3.8 MHz in Europe, Africa, and northern Asia (Region 1); and 3.5–3.9 MHz in south and east Asia and the eastern Pacific (Region 3). The upper portion of the band, which is usually used for phone (voice), is sometimes referred to as 75 meters.

Primary vs Secondary Allocations

On shared bands, amateurs may be secondary users and must not cause harmful interference to primary services. The 60-meter band is a notable example — amateur use is restricted to five specific channels with a maximum ERP of 100 W relative to a dipole.

The FCC has granted hams secondary access on USB only to five discrete 2.8-kHz-wide channels on 60 meters. The NTIA says that hams planning to operate on 60 meters "must assure that their signal is transmitted on the channel center frequency."

Complete HF Frequency Allocations by Band

80 Meters (3.5-4.0 MHz) Band Plan

80 Meters (3.5 – 4.0 MHz): This band is popular for local and regional communication, especially at night. It supports voice, CW, and digital modes. Because high absorption in the ionosphere's Sun-activated D layer persists until nightfall, 80 meters is usually only good for local communications during the day, and hardly ever good for communications over intercontinental distances during daylight hours. But it is the most popular band for regional communications networks from the late afternoon through the night time hours.

As is common for many other wide amateur bands, the lower edge of 80 meters is predominantly used for radio telegraphy (called "CW"), with the lower 10 kHz (3.5–3.51 MHz) primarily used for long-distance communications. The band segments typically follow this pattern:

• Data and CW frequency range for the 80m ham band: 3.5 MHz to 3.6 MHz
• Phone or voice frequency range for the 80m ham band: 3.6 MHz to 4 MHz
• Sideband typically used on the 80m ham band: LSB

Special segments within 80 meters include digital allocations: 3.58-3.62 Digital modes, with 3.59 as RTTY DX frequency and 3.62-3.635 for automatically controlled digital stations.

40 Meters (7.0-7.3 MHz) Frequency Segments

The 40-meter or 7-MHz band is an amateur radio frequency band, spanning 7.000-7.300 MHz in ITU Region 2, and 7.000-7.200 MHz in Regions 1 & 3. It is allocated to radio amateurs worldwide on a primary basis; however, only 7.000-7.200 MHz is exclusively allocated to amateur radio worldwide.

This band supports both long distance (DX) and intercontinental communications between late afternoon and a few hours after sunrise, and local-to-medium distance NVIS communication during most daylight hours. With its unique combination of intracontinental and intercontinental communications possibilities, 40-meters is considered a key band in building a winning HF contesting score during any part of the sunspot cycle.

The IARU Region 2 band plan for 40 meters designates specific segments for different modes:

• The band plan designates the continuous wave (CW) subband from 7.000 to 7.045 MHz, with 7.000–7.025 MHz specifically allocated as a DX window to minimize interference during intercontinental contacts. General CW operations, including QRP activities centered at 7.030 MHz, occupy 7.025–7.045 MHz.
• Single-sideband (SSB) voice communications are confined to 7.175–7.300 MHz, with a dedicated DX window from 7.175–7.250 MHz to prioritize distant signal exchanges.

The FCC allows CW and digital mode operation to all operators in the 7.025 – 7.125 MHz band. The ARRL, however, suggests that digital operators restrict their operations to 7.080-7.125 MHz.

20 Meters (14.0-14.35 MHz) DX and Contest Frequencies

The 20 meter band ranges from 14.000 to 14.350 MHz. It's split: 14.000-14.100 MHz for CW and digital (e.g., FT8 at 14.074 MHz), and 14.150-14.350 MHz for SSB voice. General/Extra hams use it for DXing, reaching thousands of miles. 20 Meters (14.0 – 14.35 MHz): Excellent for long-distance contacts during the day. This band supports many digital modes and is known for its reliability across different conditions.

Digital mode frequencies on 20 meters are highly organized:

• 20 meters • 14.074 MHz for typical operating frequencies for weak-signal digital modes
• PSK31 is assigned to the area below the RTTY segment, near 14.070 MHz. For 20m, RTTY/data modes operate within 14.070-14.095 MHz.
• 14.000-14.100 MHz: Primarily used for CW (Morse code) and highly efficient digital modes like FT8. FT8 is particularly popular in 2025 for making weak-signal DX contacts, even when conditions aren't perfect.

14.150-14.350 MHz: This is the heart of SSB (Single Sideband) voice communication, perfect for engaging in conversations with stations worldwide. 14.300 MHz: This specific frequency is often reserved for emergency communication.

15 Meters (21.0-21.45 MHz) Propagation Considerations

15 Meters (21.0 – 21.45 MHz): Active during the day, this band is good for DX (distance) operations. 15 meters – 21–21.45 MHz – Most useful during solar maximum, and generally a daytime band.

The band plan follows the standard HF pattern:

• 21.0-21.2 CW and digital, with 21.060 as QRP CW Calling frequency. 21.070-21.100 Digital modes, 21.090-21.100 Automatically controlled Digital, 21.150 CW beacons. 21.2-21.45 Voice with 21.340 SSTV, 21.385 QRP SSB Calling frequency.

10 Meters (28.0-29.7 MHz) Band Plan and Modes

The 10-meter band is one of the most versatile and exciting bands available to General license holders. It offers a wide range of operating modes and is known for its dramatic propagation changes, making it a favorite for both local and long-distance communications. The 10-meter band is particularly interesting due to its responsiveness to solar activity, which can dramatically affect its propagation characteristics. During solar maximums, this band can support worldwide communication, while during solar minimums, it's more suited to regional communications.

The 10-meter band plan is comprehensive:

• 28.0-28.3 CW and digital, 28.060 QRP CW Calling frequency, 28.070-28.120 Digital, 28.120-28.189 Automatically controlled Digital, 28.19-28.225 CW beacons. 28.3-29 SSB, 28.385 QRP SSB Calling frequency, 28.680 SSTV, 28.885 VHF liaison frequency. 29-29.2 AM, 29.3-29.51 Satellites, 29.51-29.7 FM with 29.52-29.58 Repeater inputs, 29.6 FM Calling frequency, 29.62-29.68 Repeater outputs.

License Class Privileges and Sub-band Restrictions

Technician Class HF Privileges and Limitations

Technicians have full VHF/UHF privileges and limited HF access: 10 meters plus CW on narrow portions of 80, 40, and 15 meters at 200 W PEP. Upgrading to General opens most HF segments; Extra opens the remaining exclusive sub-bands at the bottom of each HF band.

Novice/Technicians are limited to 200 watts PEP on HF bands. The Technician license gives you full access to every amateur frequency above 30 MHz, which covers the VHF and UHF bands where most local activity happens. In practice, that means the popular 2-meter and 70-centimeter bands used for repeater networks, local emergency nets, and satellite contacts. You can also work the 6-meter band, the 1.25-meter band, and frequencies all the way into the microwave range. On the HF bands below 30 MHz, Technician privileges are limited but still useful.

Specific Technician privileges on HF include:

• Technician hams get CW access (14.025-14.150 MHz) on 20 meters. On HF, they're limited to CW on parts of 80, 40, 15, and 20 meter bands (e.g., 14.025-14.150 MHz).
• 3.525-3.600 MHz on 80 meters for Novice/Technician at 200W
• Full privileges on 10 meters

General Class Frequency Access Across HF Bands

The General Class operator license authorizes privileges in all 29 amateur service bands. Mid-level license with access to most HF bands for long-distance communication.

Upgrading to General opens most HF segments; Extra opens the remaining exclusive sub-bands at the bottom of each HF band. General class operators gain access to the voice portions of all HF bands, though with some restrictions on the bottom segments of each band that are reserved for Extra class.

General class restrictions include:

• On the 40m band, Extra Class operators cannot operate SSB below 7.125 MHz. If you operate SSB on 7.120 MHz as a General class operator, you can be cited for doing so.
• Limited access to the bottom 25 kHz of most HF bands

Amateur Extra Class Expanded Privileges

Top-tier license with full privileges across all amateur radio bands. The privileges of an Advanced Class operator license include 275 kHz of additional spectrum in the HF bands. Amateur Extra class operators have access to all amateur frequencies without restriction.

Extra class privileges include:

• Full access to exclusive DX windows at the bottom of HF bands
• Priority access to the most sought-after frequencies
• Maximum flexibility for contest operations

Operating Modes and Frequency Coordination

CW Frequency Segments and Etiquette

FCC Frequency Allocation Basics

The FCC's Table of Frequency Allocations was revised on April 3, 2026, providing the most current guidance for amateur radio operators. The list of frequency ranges is called a band allocation, which may be set by international agreements, and national regulations. The modes and types of allocations within each frequency band is called a bandplan which ensures organized use of the radio spectrum.

The United States Table of Frequency Allocations (United States Table) is subdivided into the Federal Table of Frequency Allocations (Federal Table, column 4 of § 2.106) and the non-Federal Table of Frequency Allocations (non-Federal Table, column 5 of § 2.106). Amateur radio operations fall under the non-Federal table administered by the FCC.

Primary vs Secondary Allocations

Understanding allocation status is crucial for legal operation. Several amateur bands are shared with other radio services. On shared bands, amateurs may be secondary users and must not cause harmful interference to primary services. For example, The FCC has allocated 219-220 MHz to amateur use on a secondary basis. This allocation is only for fixed digital message forwarding systems operated by all licensees except Novices. Amateur operations must not cause interference to, and must accept interference from, primary services in this and adjacent bands.

Band Plan Organization Principles

Amateur radio band plans are essential guides for operators, defining where different modes and activities can be found across the HF, VHF, and UHF spectrum. These plans help ensure efficient use of the bands and minimize interference between various types of amateur radio activity, from voice QSOs to digital modes and satellite operation. Following band plans is a key part of being a considerate operator, allowing hams worldwide to share frequencies effectively.

HF Amateur Radio Bands (3-30 MHz)

160 Meter Band (1.8-2.0 MHz)

The 160 meter band represents the lowest frequency HF allocation for amateur radio. 1.800-2.000 MHz: CW, Phone, Image, RTTY/Data (1.90Mhz thru 2.0Mhz should be treated as a secondary allocation as we are required to avoid interfering with Radio-location Services in that range.) This band is popular for long-distance communication, particularly during nighttime hours when propagation improves.

This band is often taken up as a technical challenge, since long distance (DX) propagation tends to be more difficult due to higher D layer ionospheric absorption. Long-distance propagation tends to occur only at night, and the band can be notoriously noisy particularly in the summer months.

80/75 Meter Band (3.5-4.0 MHz)

The 80/75 meter band offers excellent domestic and regional communication. 3.525-3.600 MHz: CW, RTTY/Data 3.800-4.000 MHz: CW, Phone, Image provides different privileges based on license class. Works best in winter, due to atmospheric noise from hemispheric thunder storms during summer. Only countries in the Americas and few others have access to all of this band; in other parts of the world amateurs are limited to the bottom 300 kHz (or less) (85.65–83.28 m).

60 Meter Band (5.3-5.4 MHz)

The 60 meter band represents a unique channelized allocation. The FCC has granted hams secondary access on USB only to five discrete 2.8-kHz-wide channels. Amateurs can not cause inference to and must accept interference from the Primary Government users. The NTIA says that hams planning to operate on 60 meters "must assure that their signal is transmitted on the channel center frequency." This means that amateurs should set their carrier frequency 1.5 kHz lower than the channel center frequency.

In the WRC-15 Notice, the Commission sought comment on a number of proposals affecting amateur use of this band, including whether to allocate the 5351.5-5366.5 kHz band to the Amateur Radio Service on a secondary basis. Footnote US23 provides the amateur service with a secondary allocation on five discrete channels—each with a maximum bandwidth of 2.8 kilohertz and centered on frequencies 5332, 5348, 5358.5, 5373, and 5405 kHz.

40 Meter Band (7.0-7.3 MHz)

The 40 meter band is one of the most reliable HF bands for both domestic and DX communication. 7.025-7.125 MHz : CW, RTTY/Data. 7.175-7.300 MHz:: CW, Phone, Image. This band provides excellent propagation characteristics day and night, making it popular for both casual operation and contesting.

30 Meter Band (10.1-10.15 MHz)

The 30-meter band is a narrow but highly efficient band for DX communications. It's exclusively allocated for CW and digital modes, making it a favorite for operators interested in these modes. The 30-meter band is known for its excellent long-distance capabilities, particularly for digital and CW communications. Its limited bandwidth and mode restrictions help maintain a low noise level, making it ideal for weak-signal work.

20 Meter Band (14.0-14.35 MHz)

The 20-meter band is one of the most popular bands in amateur radio, especially for long-distance (DX) communications. It offers excellent daytime and evening propagation characteristics and is a favorite for worldwide communication. The 20-meter band is highly versatile, supporting a wide range of activities from casual chatting to contesting and emergency communications. Its global reach makes it a prime band for fostering international friendships and cultural exchange.

For General class operators, 14.025 -14.150 MHz CW, RTTY/Data 14.225 -14.350 MHz: CW, Phone, Image provides access to most of the band's capabilities.

17 Meter Band (18.068-18.168 MHz)

The 17 meter band is one of the WARC (World Administrative Radio Conference) bands. The 3.5, 7, 14, 21 and 28MHz bands are the bands where contests can be found. The 10, 18 and 24MHz bands, also known as the WARC bands, are kept free of contest activity by international agreement, which now also includes the 5MHz band.

15 Meter Band (21.0-21.45 MHz)

The 15 meter band offers excellent DX potential during solar maximum periods. 21.025-21.200 MHz: CW, RTTY/Data 21.275-21.450 MHz: CW, Phone, Image shows the typical segmentation for different modes within this band.

12 Meter Band (24.89-24.99 MHz)

The 12 meter band is another WARC band that remains contest-free, providing excellent opportunities for DX communication during favorable propagation conditions.

10 Meter Band (28.0-29.7 MHz)

The 10 meter band represents the highest frequency HF allocation and offers unique propagation characteristics. During solar maximum, this band can provide exceptional worldwide communication, while during solar minimum it may be limited to local communications or sporadic E propagation.

VHF and UHF Amateur Bands

6 Meter Band (50-54 MHz)

The 6 meter band serves as a bridge between HF and VHF. F2 and TE band openings from other ionospheric reflection/refraction modes, or sky-wave propagation as it is known can also occasionally occur on the low band VHF frequencies of 6 or 4 metres providing unique propagation opportunities.

2 Meter Band (144-148 MHz)

The 2-meter band is one of the most popular and widely used VHF bands in amateur radio, known for its versatility in supporting a range of activities from local chatting to emergency communications. All Amateurs except Novices: 144.0-144.1 MHz: CW Only 144.1-148.0 MHz: CW, Phone, Image, MCW, RTTY/Data defines the basic allocation structure.

1.25 Meter Band (222-225 MHz)

The 1.25-meter band offers Technician licensees a range of frequencies primarily for local and regional communication. This band is known for its use in repeater systems and weak signal work. Novice (Novices are limited to 25 watts PEP output), Technician, General, Advanced, Amateur Extra classes: 222.00-225.00 MHz: CW, Phone, Image, MCW, RTTY/Data

70 Centimeter Band (420-450 MHz)

The 70-centimeter band is a mainstay for many Technician licensees, offering a wide range of communication possibilities from local chatting to satellite operation. This band is extensively used for repeaters, digital modes, and weak signal work.

33 Centimeter Band (902-928 MHz)

The 33-centimeter band, spanning 902 to 928 MHz, is a playground for various modes and activities, including digital communication, repeaters, and experimental uses. This band is particularly popular for its suitability in urban environments due to its propagation characteristics.

License Class Privileges and Sub-band Allocations

Technician Class Frequency Privileges

With a Technician Class license, you will have all ham radio privileges above 30 MHz. These privileges include the very popular 2-meter band. Additionally, Technician licensees now also have additional privileges on certain HF frequencies. Technicians may also operate on the 80, 40 and 15 meter bands using CW, and on the 10 meter band using CW, voice and digital modes.

Technician licensees have limited privileges below 30 MHz. Novice/Technicians are limited to 200 watts PEP on HF bands. This makes the Technician license ideal for VHF/UHF operation while providing limited HF access.

General Class Band Segments

The General class license grants some operating privileges on all Amateur Radio bands and all operating modes. General class operators gain significant additional HF privileges compared to Technicians, including voice privileges on most HF bands.

Extra Class Exclusive Portions

Those with Amateur Extra licenses are granted all privileges on all US amateur bands. License Privileges: All Amateur band privileges. Extra class operators have access to exclusive band segments not available to lower license classes, particularly in the lower portions of most HF bands.

Phone vs CW vs Digital Allocations

Band plans typically organize frequencies by emission type. CW and data ( ≤ 200 Hz bandwidth). CW, RTTY and data ( ≤ 500 Hz bandwidth). CW, RTTY, data, NO SSB ( ≤ 2.7 kHz). These bandwidth restrictions help organize the spectrum and minimize interference between different modes.

Band Plans and Operating Procedures

ARRL Band Plan Recommendations

The ARRL has a "detailed band plan" for US hams showing allocations within each band. Download the band chart to help you know what bands are allocated for Amateur Radio. These recommendations help operators find appropriate frequencies for their intended activities.

DX Windows and Contest Frequencies

The HF bands are by far the most popular bands in the amateur service. Local contacts and world-wide propagation are all possible at almost anytime with careful selection of the right frequency for the time of day, time of year, and current state of the sunspot cycle.

Emergency and ARES Frequencies

Emergency communications often utilize specific frequency segments within amateur bands. Participate in emergency communications. Most emergency communications is local communications and takes place on VHF and UHF frequencies. Understanding these allocations is crucial for emergency preparedness.

Repeater Frequency Coordination

Repeater systems require careful frequency coordination to prevent interference. Most VHF and UHF bands include designated repeater sub-bands with specific input/output frequency relationships.

Microwave and SHF Amateur Allocations

23 Centimeter Band (1240-1300 MHz)

The 23-centimeter band offers a wide array of activities, from traditional voice communication to digital modes,]]>37Tue, 19 May 2026 11:04:14 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/uhf-radio-guide-frequencies-equipment-and-applications-for-ham-radio-operators-r16/For ham radio operators exploring UHF radio communications, understanding the complexities of the 70cm amateur band opens doors to exciting opportunities in repeater work, weak signal communication, satellite operations, and emergency services. This comprehensive guide examines UHF radio fundamentals, equipment selection, and practical applications that will enhance your amateur radio experience on frequencies from 420 to 450 MHz.

Understanding UHF Radio Frequencies and the 70cm Amateur Band

Ultra High Frequency (UHF) radio encompasses the frequency spectrum from 300 MHz to 3 GHz, but for amateur radio operators, the most significant allocation lies within the 70cm band. UHF is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band, where wavelengths range from one meter to one tenth of a meter.

70cm Amateur Band Allocation (420-450 MHz)

The UHF amateur allocation varies by region, with the United States and Trinidad and Tobago allocating 420 to 450 MHz to amateurs, while the ITU amateur radio allocation is from 430 to 440 MHz. This 30 MHz allocation provides substantial spectrum space for various operating modes and applications.

Technicians and higher class licensees have privileges across the entire 70 cm band, 420 to 450 MHz. The 70 cm band is BIG…providing 30 MHz of spectrum compared to only 4 MHz on 2 Meters. This expansive frequency range allows for diverse amateur radio activities including FM repeaters, digital modes, weak signal work, and experimental applications.

FCC Regulations and Band Plans for UHF

The Federal Communications Commission provides specific guidelines for UHF amateur operations. The FCC rules do not specify any mode restrictions on this band, offering operators considerable flexibility in choosing communication methods. However, there is a restriction on operating below 430 MHz if you are close to the US border with Canada, prohibited north of Line A, which runs just south of the Canada–US border.

The ARRL band plan divides the 70cm spectrum into segments optimized for different applications. The ARRL 70 cm amateur band plan supports a wide variety of radio operation. Large portions of the band are dedicated to FM operation, consistent with the popularity of the FM mode. The band plan includes dedicated segments for:

• ATV (Amateur Television) at the low end of the band
• EME (Earth-Moon-Earth) communication
• Weak signal work and propagation beacons
• FM repeater inputs and outputs
• Simplex operations
• Digital modes including DMR, D-STAR, and System Fusion

International UHF Amateur Allocations

International amateur allocations vary significantly by region. In Canada and Australia, the band is 430–450 MHz. In the UK and Ireland amateurs are allocated 430–440 MHz. These variations require careful attention when operating portable or planning international communications.

UHF Radio Propagation Characteristics

UHF radio waves exhibit unique propagation characteristics that distinguish them from lower frequency bands. Understanding these properties enables operators to optimize their station configurations and communication strategies.

Line-of-Sight Propagation Properties

Line-of-sight propagation is the most common propagation mode at VHF and above, and the only possible mode at microwave frequencies and above. On the surface of the Earth, line of sight propagation is limited by the visual horizon to about 40 miles (64 km).

UHF radio waves are blocked by hills and cannot travel beyond the horizon, but can penetrate foliage and buildings for indoor reception. However, VHF and UHF radio signals generally travel around one third further than our strict line of sight calculations suggest they should due to atmospheric refraction effects.

The practical implications of line-of-sight propagation include:

• Antenna height becomes critically important for communication range
• Terrain features significantly impact signal coverage
• Building penetration is possible but with increased attenuation
• Direct path communication is optimal for reliability

Atmospheric Effects on UHF Signals

Atmospheric moisture reduces, or attenuates, the strength of UHF signals over long distances, and the attenuation increases with frequency. This frequency-dependent attenuation becomes more pronounced during periods of high humidity or precipitation.

VHF/UHF enthusiasts generally have their sights set on the troposphere. Under normal or flat conditions most VHF and UHF communications are generally thought to be line of sight. Fortunately, reality is actually a little different thanks to the way VHF and UHF signals can be refracted.

Tropospheric Ducting and Enhancement

Tropospheric conditions can dramatically extend UHF communication ranges under specific atmospheric conditions. When humidity and temperature shift, you sometimes get tropospheric ducting. That's when signals go way farther than usual. It happens more over oceans or during long-lasting high-pressure weather.

Temperature inversions occur frequently along coastal areas bordering large bodies of water. This is the result of the movement of cool, humid air shortly after sunset when the ground air cools more quickly than the upper air layers. The same action may take place in the morning when the rising sun warms the upper layers.

Knife-Edge Diffraction and Terrain Effects

Sharp terrain features can provide limited signal propagation beyond line-of-sight through diffraction. Diffraction occurs when a VHF or UHF wave comes to a sharp edge, a portion of the wave bends around the edge and continues propagation as if a very low power radio was placed at the top of the ridge. It is important that the ridge be relatively sharp.

Research shows significant terrain impact on UHF propagation. The measured results show that the models' prediction errors follow the terrain profile and also that the clutter effects are noticeable along each route with varying degrees of impact. The UHF and VHF bands have average SDEs of 10.5 and 7.5 dB, respectively.

UHF Antennas: Design and Performance

UHF antenna design offers unique advantages due to shorter wavelengths, allowing for practical high-gain antennas and convenient mounting solutions.

Yagi Antennas for UHF Applications

Also called a beam antenna and parasitic array, the Yagi is widely used as a directional antenna on the HF, VHF and UHF bands. It has moderate to high gain of up to 20 dBi, depending on the number of elements used, and a front-to-back ratio of up to 20 dB.

UHF Yagi antennas offer several advantages:

• High gain potential with reasonable boom lengths
• Excellent directivity for weak signal work
• Moderate bandwidth suitable for amateur allocations
• Relatively lightweight construction

An M2 Antennas 440-21ATV Yagi for 70 cm features 21 elements on a 14.5′ boom, 18 dBi gain/23 dB F/B, demonstrating the performance potential of well-designed UHF Yagi arrays.

Vertical Antennas and Ground Plane Requirements

A ground plane antenna for 2m or 70cm is one of the simplest antennas to build and get working, and it can work quite well for repeater or simplex operation. It is easy to build for other bands as well. They are easy to adjust for low SWR, often just by bending the wires up or down, and cover a wide bandwidth.

Ground plane antenna construction for UHF typically involves:

• Quarter-wave vertical element (approximately 16.5 cm at 435 MHz)
• Three or four radial elements for proper impedance matching
• SO-239 connector as the base and mounting point
• Solid wire construction for mechanical stability

The angle of the radials sets the feedpoint impedance, and around 45 degrees is typical in many cases, providing close to 50-ohm impedance matching for most transceivers.

Mobile UHF Antenna Considerations

UHF wavelengths are short enough that efficient transmitting antennas are small enough to mount on handheld and mobile devices, so these frequencies are used for two-way land mobile radio systems, such as walkie-talkies, two-way radios in vehicles.

Mobile UHF antennas benefit from:

• Compact size allowing versatile mounting options
• Reduced impact of vehicle body on radiation pattern
• Practical high-gain mobile antennas
• Multiple antenna systems for different applications

UHF Antenna Modeling and Optimization

Modern antenna modeling software enables precise UHF antenna optimization. The elements diameter of the antenna may vary between 5...10mm and the dipole diameter may vary between 8...14mm without the need of changing anything to the length or spacing. All elements except the dipole are electrically connected to the boom. The ideal SWR can vary a bit if the elements are isolated, raised from the boom or do to construction.

UHF Ham Radio Equipment Reviews and Recommendations

The UHF equipment market offers diverse options from entry-level handhelds to sophisticated base station transceivers, each designed for specific applications and operating styles.

Best UHF Handheld Transceivers

Current handheld transceiver recommendations reflect advances in digital modes, battery technology, and user interface design. The Anytone AT-D878UVII Plus is a versatile handheld that excels in FM, DMR, and APRS functionality. Its large color screen and built-in GPS make it a standout for those looking for advanced features in a single device. Despite its brick-like form factor, it delivers exceptional value for its price.

Top handheld recommendations include:

• Kenwood TH-D75A: The TH-D75A is widely considered the most advanced handheld amateur radio currently available. Because it supports both APRS and D-STAR natively, it is often regarded as one of the most versatile handheld radios available
• Yaesu FT5DR: Yaesu's FT5DR is a feature-packed handheld perfect for hams looking to explore digital modes and APRS functionality. Its rugged design includes waterproofing and a large color touchscreen, making it durable and user-friendly. Supporting the System Fusion (C4FM) digital mode, the FT5DR is easy to set up and operate
• Yaesu FT-65R: The Yaesu FT-65R stands out for its rugged design and reliability, making it a favorite for emergency communications. Its straightforward programming and strong manufacturer support make it a great choice for those prioritizing durability over advanced features

Mobile UHF Radio Comparison

Mobile UHF radios serve as the backbone of many amateur radio operations, providing higher power output and advanced features compared to handhelds. Modern mobile units typically offer 50-75 watts output on UHF, with sophisticated DSP processing and multiple operating modes.

UHF Base Station Equipment

Base station UHF equipment enables serious weak signal work and contesting activities. The Icom IC-9100 Transceiver provides 100W on 2M and 75W on 70cm barefoot. This should be enough power to have some fun on these bands initially, though many operators add external amplifiers for enhanced performance.

Power Amplifiers for 70cm Band

UHF power amplifiers enable weak signal communication and contest-level performance. Antennas capable of handling 1KW+ power are recommended for serious UHF work, though power limitations and thermal considerations become increasingly important at UHF frequencies.

UHF Applications in Amateur Radio

The 70cm band supports numerous amateur radio applications, from local repeater communications to advanced weak signal modes and satellite operations.

Repeater Operations on UHF

The standard repeater offset used on this band is 5 MHz. Some areas of the country use + 5 MHz offset while others use – 5 MHz. Within any region, the offset will be usually be the same on all repeaters. This standardization simplifies repeater programming and coordination.

70 centimeters is a popular ham band due to the ready availability of equipment in both new and used markets, contributing to robust repeater networks across most populated areas.

Weak Signal Communication Modes

UHF weak signal work encompasses traditional modes like CW and SSB, as well as modern digital weak signal modes. There is space set aside for weak signal work as well as propagation beacons in the lower portion of the 70cm band.

Popular weak signal activities include:

]]>16Thu, 02 Apr 2026 11:04:04 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/vhf-radio-complete-guide-to-very-high-frequency-amateur-radio-r15/What is VHF Radio and Why Ham Operators Love It

Very High Frequency (VHF) radio represents one of the most accessible and versatile segments of the amateur radio spectrum, making it an ideal entry point for new hams while offering sophisticated capabilities that keep experienced operators engaged. Frequencies between 30 and 300 MHz are referred to as Very High Frequency (VHF) region, providing amateur radio operators with a unique blend of local and long-distance communication opportunities.

The popularity of VHF radio among ham operators stems from its practical advantages and diverse applications. The 2-meter band is one of the most popular and widely used VHF bands in amateur radio, known for its versatility in supporting a range of activities from local chatting to emergency communications. This accessibility makes VHF an excellent choice for both newcomers learning the ropes and seasoned operators who need reliable local communication.

VHF Frequency Spectrum and Amateur Allocations

The VHF amateur radio spectrum encompasses several important bands, each with distinct characteristics and applications. Of the bands available, 6 Metres and 2 Metres are possibly the most widely used and popular of the VHF ham radio allocations. The primary VHF amateur bands include:

• 6 meters (50-54 MHz): The 6-meter band, often referred to as the "Magic Band," offers a unique blend of local and long-distance communication possibilities. Technician licensees have full privileges on this band, which can experience sporadic E propagation, opening up paths for intercontinental communication
• 2 meters (144-148 MHz): Most popular VHF band. Lots of repeaters. Great for local communication and emergency nets
• 1.25 meters (222-225 MHz): The 1.25-meter band offers Technician licensees a range of frequencies primarily for local and regional communication

Line-of-Sight Propagation Characteristics

Understanding VHF propagation is crucial for effective operation. While "line of sight" propagation is a primary factor for range calculation, much of the interest in the bands above HF comes from use of other propagation modes. A signal transmitted on VHF from a hand-held portable will typically travel about 5–10 km (3–6 miles) depending on terrain. With a low power home station and a simple antenna, range would be around 50 km (30 miles).

However, VHF offers more than just line-of-sight communication. With a large antenna system like a long yagi, and higher power (typically 100 watts or more) contacts of around 1 000 km (600 miles) using the Morse code (CW) and single-sideband (SSB) modes are common. This capability makes VHF attractive for both casual local contacts and serious DXing efforts.

Essential VHF Radio Equipment for Ham Operators

Selecting the right VHF equipment is crucial for maximizing your amateur radio experience. The market offers an extensive range of options, from budget-friendly handheld transceivers to sophisticated base station setups. Understanding the differences between these options will help you make informed decisions based on your specific needs and operating style.

Best VHF Transceivers: Handheld vs Mobile vs Base

VHF transceivers come in three primary form factors, each suited to different applications and operating environments.

Handheld Transceivers remain the most popular choice for new operators. The Wouxun KG-UV9P and D Plus are dual-band (VHF/UHF) handheld transceivers that combine robust performance with a sleek, professional appearance. The two radios are virtually the same, with the P being a higher power version of the D Plus. For those seeking advanced features, The Baofeng DM-1701 is a dual-band (VHF/UHF) handheld transceiver that supports both analog and digital (DMR Tier II) modes. It's a popular choice among amateur radio enthusiasts for its affordability and feature set.

Mobile Transceivers offer higher power output and improved features for vehicle installation. The QYT KT-8900R mobile radio is a 25W tri-band mobile transceiver with dual watch and dual standby. This radio is designed for new ham users and has many features such as programmable memory, scan function, built-in voice synthesizer and more. These units typically provide 25-50 watts of output power, significantly extending communication range compared to handhelds.

Base Station Transceivers represent the pinnacle of VHF performance. IC-9700 is a tri-band transceiver producing 100W on 2m, 75W on 70cm, and 10W on 23cm, meaning you have a powerful radio even on local repeaters. You have unlimited band management settings to choose from when using the IC-9700. You can adjust the RF power, TX delay, and TX power limit to transmit.

Power Output Considerations for VHF

Power output requirements vary significantly based on your intended applications. Standard HF transceivers output 100 watts, which provides reliable communication under most conditions. QRP radios operate at 5-20 watts, requiring better antennas and more operating skill but offering portability and battery efficiency. New hams typically start with 100-watt radios for the best chance of successful contacts.

For VHF applications, consider these power levels:

• Handheld (1-10W): Ideal for local repeater access and short-range simplex
• Mobile (25-50W): Excellent balance of power and efficiency for vehicle operation
• Base (50-100W+): Maximum performance for weak signal work and DXing

Dual-Band and Tri-Band Radio Options

Multi-band radios offer exceptional versatility for VHF/UHF operation. Frequency: TX: 28-29.7/50-54/144-148/420-450MHz, RX: 26-33/47-54/108-180/320-512/750-950MHz (P.S. AM mode selectable on VHF receive frequencies for Air Band reception), Output Power VHF: 50/20/10/5W UHF: 35/20/10/5W.

Popular multi-band options include:

• Dual-band (2m/70cm): Most common configuration covering the popular VHF and UHF amateur bands
• Tri-band (6m/2m/70cm): Adds 6-meter capability for enhanced propagation opportunities
• Multi-band: Some radios include additional bands like 1.25m or even HF coverage

VHF Antennas: Maximizing Your Signal

The antenna system is arguably the most critical component of any VHF station. Unlike HF antennas that can be physically large and complex, VHF antennas are more manageable while still offering significant performance improvements. The right antenna choice can mean the difference between weak local contacts and strong long-distance communications.

Yagi Antennas for VHF DX and Weak Signal Work

Yagi antennas represent the gold standard for directional VHF communication. At its core, a VHF Yagi is a highly efficient directional antenna designed to concentrate radio frequency (RF) energy in a single direction. Based on fundamental antenna theory developed by Hidetsugu Yagi and Shintaro Uda, its design is an elegant interplay of parasitic elements. The structure consists of a single driven element (typically a dipole or folded dipole, which is connected to the feedline), a slightly longer reflector element behind it, and one or more shorter director elements in front. The reflector bounces RF energy forward, while the directors progressively focus it into a tight, forward-looking beam. This clever arrangement is what gives the Yagi its signature gain and directionality, transforming an omnidirectional signal into a focused stream of energy.

Yagi antenna performance is characterized by several key metrics:

• Gain: Measured in dBi (decibels relative to an isotropic radiator) or dBd (decibels relative to a dipole), gain quantifies the antenna's ability to concentrate power in its favored direction
• Beamwidth: This is the angular width of the antenna's main lobe, measured in degrees at the half-power (-3 dB) points. A narrow beamwidth indicates highly focused energy but requires more precise aiming with a rotator. A wider beamwidth is more forgiving but offers less gain
• Front-to-back ratio: Measures the antenna's ability to reject signals from the rear

Common Yagi Configurations

VHF Yagi antennas come in various configurations to suit different applications:

2-element Yagi: A driven element and a reflector. Simple, modest gain. 3-element Yagi: Adds a director for better performance. Multi-element Yagi: More directors for serious gain and sharp focus.

For amateur radio applications, Yagis are favorites on HF, VHF, and UHF bands for DXing, contests, and satellites. Great for rural areas with weak signals. Directional focus improves clarity. Additionally, with circular polarization and tracking rotators, Yagis are perfect for working LEO satellites.

Vertical Antennas for Local Repeater Access

Vertical antennas excel for local and mobile VHF communication. Their omnidirectional pattern makes them ideal for accessing repeaters from any direction without the need for antenna rotation. Popular vertical antenna types include:

• Ground plane antennas: Simple and effective, consisting of a vertical radiator with horizontal ground radials
• Colinear arrays: Multiple vertical elements stacked to increase gain while maintaining omnidirectional coverage
• Mobile whips: Quarter-wave or longer antennas designed for vehicle mounting

J-Pole and Slim Jim Antenna Designs

J-pole and Slim Jim antennas offer excellent performance for VHF applications while being relatively simple to construct. These end-fed antennas provide:

• Low-angle radiation patterns ideal for local communication
• No ground plane requirements
• Broadband operation across VHF amateur bands
• Cost-effective construction using common materials

The J-pole design uses a quarter-wave radiator fed through a half-wave matching section, while the Slim Jim extends this concept with additional elements for improved performance and bandwidth.

Antenna Placement and Height Considerations

Antenna height significantly impacts VHF performance. The higher, the better—especially for VHF/UHF. Elevation reduces obstructions and improves line-of-sight paths. For VHF operation, consider these guidelines:

• Height above ground: Each additional 10 feet of height can extend your communication range
• Clear line of sight: Remove or minimize obstructions in your primary communication directions
• Ground effects: Height above electrical ground affects radiation patterns and impedance
• Safety considerations: Follow local building codes and safe installation practices

Pointing matters. A small misalignment can lead to big signal losses. Many hams use rotators for precise aiming. This precision becomes critical when working weak signals or distant stations.

VHF Propagation Modes and Opportunities

While VHF is primarily known for line-of-sight communication, numerous propagation modes offer exciting opportunities for long-distance contacts. Understanding these propagation mechanisms opens up new possibilities for VHF operators and explains why many consider VHF the most exciting segment of amateur radio.

Tropospheric Propagation and Band Openings

Tropospheric propagation extends VHF communication well beyond normal line-of-sight limits. Band openings are sometimes caused by a weather phenomenon known as a tropospheric "inversion", where a stagnant high pressure area causes alternating stratified layers of warm and cold air generally trapping the colder air beneath. This may make for smoggy or foggy days, but it also causes VHF and UHF radio transmissions to travel or duct along the boundaries of these warm/cold atmospheric layers. Radio signals have been known to travel hundreds, even thousands of kilometres (miles) due to these unique weather conditions.

These conditions can produce remarkable results. For example: The longest distance reported contact due to tropospheric refraction on 2 metres is 4 754 km (2 954 miles) between Hawaii and a ship south of Mexico. Such extreme distances demonstrate the potential of VHF when atmospheric conditions align favorably.

Tropospheric enhancements occur most frequently:

• During high-pressure weather systems
• In late summer and early fall
• Along coastal areas where temperature inversions are common
• During temperature inversion conditions

Meteor Scatter Communication Techniques

Meteor scatter communication utilizes the ionized trails left by meteors entering Earth's atmosphere. These brief ionization events can reflect VHF signals across distances of 500-]]>15Wed, 01 Apr 2026 11:04:06 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/complete-guide-to-ham-radio-bands-frequencies-privileges-and-propagation-r8/Understanding the complete spectrum of amateur radio frequencies is essential for every ham radio operator, whether you're just getting your Technician license or working toward Amateur Extra class privileges. The amateur radio bands represent one of the most fascinating aspects of our hobby, offering everything from local neighborhood communications to worldwide DX contacts that span continents and oceans.

This comprehensive guide explores every aspect of ham radio bands, from the technical details of frequency allocation to the practical realities of propagation and operating procedures. We'll examine how each band behaves differently throughout the solar cycle, understand the privileges granted to each license class, and discover the best practices for maximizing your on-air experience.

Understanding Amateur Radio Band Allocation

The foundation of amateur radio operation rests on a complex system of frequency allocation that spans international agreements, federal regulations, and volunteer coordination. Understanding this system is crucial for every ham radio operator who wants to operate legally and effectively.

FCC Frequency Allocation for Amateur Radio

The International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions globally, while individual amateur stations are free to use any frequency within authorized frequency ranges. In the United States, the Amateur Radio Service is regulated by the Federal Communications Commission (FCC) under Part 97 of the radio regulations.

The General Class operator license authorizes privileges in all 29 amateur service bands, though the specific portions of those bands available depend on your license class. As of February 13, FCC-licensed amateur operators holding General Class or higher licenses may operate on a secondary basis anywhere between 5351.5 and 5366.5 kHz, subject to a maximum bandwidth of 2.8 kHz and maximum transmit power of 9.15 watts ERP on the new 60-meter allocation.

ITU Regions and International Band Plans

Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio, with international agreements assigning amateur radio bands which differ by region. ITU Region 2 consists of the Americas, including Greenland, which determines the band plans we use in the United States.

The three ITU regions each have slightly different amateur allocations, reflecting the varying needs and interference environments in different parts of the world. This regional approach allows for more efficient spectrum use while maintaining global coordination for amateur radio activities.

Primary vs Secondary Allocations

Understanding the difference between primary and secondary allocations is crucial for responsible amateur radio operation. The FCC has granted hams secondary access on USB only to five discrete 2.8-kHz-wide channels, where amateurs cannot cause inference to and must accept interference from the Primary Government users.

Amateurs are cautioned that this allocation is strictly on a secondary basis, and amateurs must avoid interfering with non-amateur stations using this spectrum. This obligation includes the responsibility to monitor for such stations using appropriate receiver bandwidths. The FCC emphasized that "allowing amateur operations in this band while fully protecting incumbent primary Federal operations is our priority, and even intermittent interference in this band could jeopardize important Federal operations."

HF Bands (3-30 MHz) - The Heart of Ham Radio

The HF bands form the backbone of amateur radio's long-distance communication capabilities. These frequencies leverage ionospheric propagation to enable contacts around the globe, making them the preferred choice for DXers, contesters, and emergency communicators.

80/75 Meters (3.5-4.0 MHz) Characteristics

The 80-meter band features ground wave and night sky wave propagation, making it excellent for regional and continental contacts at night, though it requires large antennas. Often called the 'Top Band', this band is very noisy in summer but provides excellent DX in winter nights.

The 80-meter band is particularly challenging for new hams due to its nighttime-only DX characteristics and high atmospheric noise levels during summer months. However, experienced operators prize this band for its reliable regional coverage and exceptional winter DX capabilities when conditions align properly.

40 Meters (7.0-7.3 MHz) Worldwide Communication

The 40-meter band uses primarily night sky wave propagation and is reliable for regional (500-1000 mi) contacts, while also providing good NVIS during the day. If you could only choose one low HF band for reliability, 40 meters would be hard to beat. It's a hybrid band that behaves like both day and night bands, with daytime range up to approximately 3000 km and nighttime providing even longer distances, with F2 propagation often available 24/7 except during deep solar minimum.

20 Meters (14.0-14.35 MHz) DX Propagation

The 20-meter band is one of the most popular bands in amateur radio, especially for long-distance (DX) communications. It offers excellent daytime and evening propagation characteristics and is a favorite for worldwide communication. The 20-meter band is highly versatile, supporting a wide range of activities from casual chatting to contesting and emergency communications. Its global reach makes it a prime band for fostering international friendships and cultural exchange.

The 20-meter band serves as the primary DX band, even during solar minimum, with consistent worldwide F2 skip for several hours daily. During solar maximum, it may remain open all night, features lower atmospheric noise, and provides reliable worldwide performance year-round, though it's often crowded due to popularity.

15 Meters (21.0-21.45 MHz) and Solar Cycle Impact

Higher bands (10m, 12m, 15m, 17m, 20m) are more productive during solar cycle peaks with high solar flux, while lower bands (80m, 160m) work well regardless of solar activity. The higher HF bands of 17-, 15-, 12-, and 10-meters are opening regularly for long-distance communications activity as we progress through Solar Cycle 25.

The lower frequency HF bands, 20-meter band (14 MHz) and lower, are usually effectively redirected toward the earth by the ionosphere. However, the higher frequency HF bands, such as 15-meters (21 MHz), 12-meters (24 MHz), and 10-meters (28 MHz), will be bent sufficiently to return to earth only during periods when ion density in the ionosphere is relatively great. When this happens these bands are said to "open" for long-distance communications use.

10 Meters (28.0-29.7 MHz) Sporadic E Propagation

The 10-meter band represents the highest frequency amateur allocation in the HF spectrum, making it highly dependent on solar activity for conventional F-layer propagation. However, it also benefits from sporadic E propagation, which can provide exciting short-skip contacts even during solar minimum periods.

The unpredictability of sporadic E can be both a challenge and an exciting opportunity for operators. Those with well-equipped stations and the ability to act quickly when openings occur can experience thrilling DX on bands that are usually limited to local contacts. Even modest stations can sometimes take advantage of these events, especially during the peak months, making sporadic E one of the most interesting propagation modes for VHF enthusiasts.

VHF/UHF Bands - Line of Sight Communications

While HF bands capture much of the attention for long-distance work, the VHF and UHF bands offer their own unique capabilities and challenges. These frequencies excel at local and regional communications while occasionally providing surprising long-distance opportunities through various propagation modes.

6 Meters (50-54 MHz) Magic Band Phenomena

The 6-meter band from 50-54 MHz sometimes allows extended range because of band conditions — it's possible that you can talk to other hams several states away on this "magic band." Most times, the band is relatively quiet. Sporadic E provides occasional, short-lived propagation mode allowing long-distance communication on the 6-meter band.

The 6-meter band holds special appeal for many amateur radio operators because it combines the propagation characteristics of both HF and VHF. During periods of enhanced solar activity, it can exhibit F-layer skip similar to HF bands, while sporadic E can provide continental-distance contacts at unexpected times.

2 Meters (144-148 MHz) Repeater Operations

The 2-meter band is one of the most popular and widely used VHF bands in amateur radio, known for its versatility in supporting a range of activities from local chatting to emergency communications. The 2-meter band at 144-148 MHz and the 70-centimeter band from 420-450 MHz offer direct base and mobile operations in your general vicinity, as well as wider areas through repeaters that "repeat" your signal to other hams. Many hams have dual-band radios that allow operation on both bands.

The privileges of a Technician Class operator license include operating an amateur station that may transmit on channels in any of 17 frequency bands above 50 MHz with up to 1,500 watts of power, making 2 meters accessible to all license classes with full privileges.

70 cm (420-450 MHz) Amateur Television

The 70-centimeter band is a mainstay for many Technician licensees, offering a wide range of communication possibilities from local chatting to satellite operation. This band is popular for amateur television (ATV), experimenting with high-speed digital modes, and microwave ham activity.

UHF bands feature line-of-sight propagation similar to VHF, with UHF signals traveling straight and limited by the horizon. However, UHF signals can penetrate buildings and urban environments more effectively than VHF, and can also benefit from tropospheric ducting for extended range.

Microwave Bands and EME Communication

The 33-centimeter band, spanning 902 to 928 MHz, is a playground for various modes and activities, including digital communication, repeaters, and experimental uses. This band is particularly popular for its suitability in urban environments due to its propagation characteristics. The 23-centimeter band offers a wide array of activities, from traditional voice communication to digital modes, satellite operation, and even amateur television. It's a band that appeals to a broad spectrum of amateur radio enthusiasts due to its versatility.

The microwave bands represent the frontier of amateur radio technology, offering opportunities for moonbounce (EME) communication, high-speed data transmission, and cutting-edge antenna experimentation. These frequencies require specialized equipment but reward operators with unique propagation characteristics and technical challenges.

License Class Privileges by Band

Understanding the privileges granted to each license class is essential for legal operation and planning your amateur radio activities. The three current license classes each offer different levels of access to the amateur radio spectrum.

Technician Class Frequency Privileges

The entry-level license, known as Technician Class, is awarded after an applicant successfully completes a 35-question multiple choice written examination. The license grants full operating privileges on all amateur bands above 30 MHz and limited privileges in portions of the high frequency (HF) bands.

Because it was originally meant to encourage experimentation, Technician Class licensees have full privileges in the amateur radio bands above 50 MHz. You can operate any mode at power levels up to 1,500 W! Technician licensees now also have additional privileges on certain HF frequencies. Technicians may also operate on the 80, 40 and 15 meter bands using CW, and on the 10 meter band using CW, voice and digital modes.

General Class Upgrade Benefits

The General Class license is for those who want to do more in amateur radio. General Class licensees can do all of the things that Technicians can, but they are given more HF privileges, most notably, can operate digital modes and SSB phone on the HF bands below 28 MHz. Generals can also operate at full output power of 1500 W, on most of the HF bands.

General Class requires passage of the Technician test, as well as a 35-question multiple-choice General exam. General class licensees are granted privileges on portions of all amateur bands, and have access to over 83% of all amateur HF bands.

The biggest incentive for upgrading from Tech to General is the increased HF privileges. Generals can transmit on two new longwave bands that are below the AM broadcast band, as well as 10 HF bands that allow worldwide communications in a variety of modes. Many hams who go for the General class license do so because they want those HF privileges. If you are interested in providing emergency communications, having access to most HF bands almost is a necessity so that you can pass or receive traffic depending on the propagation at various times on each band. General class licensees have access to all amateur bands, just not every amateur HF frequency.

Amateur Extra Class Full Privileges

Amateur Extra represents the highest license class, providing full operating privileges on all amateur bands and modes, with access to exclusive Extra-only frequency segments including prime DX frequencies. The Amateur Extra class license conveys all available US Amateur Radio operating privileges on all bands and all modes. Earning the license is more difficult; it requires passing]]>8Tue, 31 Mar 2026 06:02:48 +0000https://www.hamradiobase.com/articles.html/11_frequencies-bands/ham-radio-frequencies-complete-guide-to-amateur-radio-bands-and-allocations-r7/Welcome to the most comprehensive guide to ham radio frequencies and amateur radio frequency allocations available on the web. Whether you're a newly licensed Technician or an experienced Extra class operator, understanding the complex world of amateur radio bands is essential for effective communication and regulatory compliance. This complete reference covers everything from basic frequency concepts to advanced propagation characteristics across all amateur radio bands.

Ham radio frequencies form the foundation of amateur radio communication, spanning from the low frequency (LF) bands at 135 kHz all the way up to microwave frequencies above 300 GHz. At all times, transmitter power must be the minimum necessary to carry out the desired communications. Unless otherwise noted, the maximum power output is 1500 watts PEP. Understanding these frequency allocations and band plans is crucial for legal operation and effective communication in the amateur radio service.

Understanding Amateur Radio Frequency Bands

What are ham radio frequencies

Ham radio frequencies are specific portions of the radio spectrum allocated by the Federal Communications Commission (FCC) for use by licensed amateur radio operators. Amateur radio frequency allocation is done by national telecommunication authorities. Globally, the International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions. Individual amateur stations are free to use any frequency within authorized frequency ranges; authorized bands may vary by the class of the station license.

These amateur radio frequency allocations differ significantly from commercial broadcasting frequencies. While commercial stations are assigned specific channels, amateur operators have the flexibility to use any frequency within their allocated bands, subject to license class restrictions and band plan guidelines. This flexibility enables diverse communication modes including voice (phone), continuous wave (CW), digital modes, and image transmission.

Radio amateurs use a variety of transmission modes, including Morse code, radioteletype, data, and voice. Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio. The amateur service encompasses both terrestrial and satellite communications, with separate frequency allocations for each type of operation.

FCC frequency allocations for amateur radio

The FCC administers amateur radio frequency allocations in the United States through Part 97 of the Code of Federal Regulations. The Federal Table is administered by NTIA and the non-Federal Table is administered by the Federal Communications Commission (FCC). These allocations are regularly updated to reflect changes from World Radiocommunication Conferences (WRC) and domestic policy decisions.

Recent changes to amateur frequency allocations have been significant. This final rule is effective February 13, 2026. Most notably, The new 60-meter frequencies approved by the FCC in December will become available to amateurs as of February 13, 2026, along with new power restrictions on those frequencies. As of February 13, FCC-licensed amateur operators holding General Class or higher licenses may operate on a secondary basis anywhere between 5351.5 and 5366.5 kHz, subject to a maximum bandwidth of 2.8 kHz and maximum transmit power of 9.15 watts ERP (effective radiated power).

The FCC frequency allocation process involves coordination with other spectrum users, particularly government agencies. In the United States, radio spectrum may be allocated to either Federal or non-Federal use exclusively, or for shared use. In the case of shared use, the type of service(s) permitted need not be the same (e.g., Federal FIXED, non-Federal MOBILE).

Primary vs secondary frequency allocations

Understanding primary versus secondary frequency allocations is crucial for amateur radio operators. Primary allocations give the service priority protection from interference, while secondary allocations must not cause harmful interference to primary services and must accept any interference from them.

Most amateur radio bands operate on a primary basis, meaning amateur operators have equal rights with other primary services. However, some amateur allocations are secondary. Amateur operations must not cause interference to, and must accept interference from, primary services in this and adjacent bands. For example, the 219-220 MHz allocation is secondary, and Amateur stations are limited to 50 W PEP output and 100 kHz bandwidth. Automated Maritime Telecommunications Systems (AMTS) stations are the primary occupants in this band. Amateur stations within 398 miles of an AMTS station must notify the station in writing at least 30 days prior to beginning operations. Amateur stations within 50 miles of an AMTS station must get permission in writing from the AMTS station before beginning operations.

Band plan basics and organization

The list of frequency ranges is called a band allocation, which may be set by international agreements, and national regulations. The modes and types of allocations within each frequency band is called a bandplan; it may be determined by regulation, but most typically is set by agreements between amateur radio operators.

Central to its practice are the band plans, which are essential for orderly and efficient use of radio frequency spectrum. These plans vary depending on the license level of the operator, with each level granting access to different frequency bands. Understanding these band plans is crucial for all amateur radio enthusiasts, as it ensures compliance with regulations and promotes effective communication.

Band plans serve multiple purposes: they organize different operating modes within each band, designate calling frequencies, establish contest and DX windows, allocate emergency frequencies, and coordinate repeater operations. Amateur radio band plans are essential guides for operators, defining where different modes and activities can be found across the HF, VHF, and UHF spectrum. Amateur radio band plans are essential guides for operators, defining where different modes and activities can be found across the HF, VHF, and UHF spectrum. These plans help ensure efficient use of the bands and minimize interference between various types of amateur radio activity, from voice QSOs to digital modes and satellite operation. Following band plans is a key part of being a considerate operator, allowing hams worldwide to share frequencies effectively.

HF Amateur Radio Bands (3-30 MHz)

The HF amateur radio bands represent the heart of long-distance communication in amateur radio. 3 MHz to 30 MHz - Long-distance communication through sky wave propagation. The traditional shortwave amateur radio bands for worldwide (DX) contacts. These bands utilize ionospheric propagation to enable communication over thousands of miles with relatively modest power levels.

160 meter band (1.8-2.0 MHz)

160 metres – 1 800–2 000 kHz (1.800–2.000 MHz) Just above the commercial AM broadcast band. Allocations in this band vary widely from country to country; it was formerly shared with the largely defunct Loran-A radionavigation system. This band is often taken up as a technical challenge, since long distance (DX) propagation tends to be more difficult due to higher D layer ionospheric absorption. Long-distance propagation tends to occur only at night, and the band can be notoriously noisy particularly in the summer months.

Notes: Often called the 'Top Band'. Very noisy in summer. Excellent DX in winter nights. The 160-meter band requires large antennas due to the long wavelength, making it challenging for operators with limited space. Propagation: Ground wave and night sky wave. Excellent for regional and continental contacts at night. Requires large antennas.

80/75 meter band (3.5-4.0 MHz)

The 80/75 meter band offers reliable regional and continental communication, particularly during nighttime hours. Works best in winter, due to atmospheric noise from hemispheric thunder storms during summer. Only countries in the Americas and few others have access to all of this band; in other parts of the world amateurs are limited to the bottom 300 kHz (or less) (85.65–83.28 m). In the US and Canada the portion of the band from 3.600–4.000 MHz, regulation permits use of single-sideband voice as well as AM voice; this sub-band is often referred to as "the 75 metre band", in part to distinguish it from the internationally available frequencies below it.

Propagation: Primarily night sky wave. Reliable for regional (500-1000 mi) contacts. Good for NVIS during day. The band is divided into different segments for CW, phone, and digital operations, with specific allocations varying by license class.

60 meter band (5.3-5.4 MHz)

The 60-meter band represents one of the newest additions to the amateur radio spectrum, with significant recent changes. A relatively new allocation and originally only available in a small number of countries such as the United States, United Kingdom, Ireland, Norway, Denmark, and Iceland, but now continuing to expand. In most (but not all) countries, the allocation is broken into channels and may require a special licensing request.

Recent FCC rule changes have expanded 60-meter access. Here's the confusing part: The existing 60-meter channels centered on 5332, 5348, 5373, and 5405 kHz remain as secondary amateur allocations with maximum power of 100 watts ERP. However, the old channel at 5358.5 kHz is eliminated as it is now part of the new 5351.5-5366.5 kHz subband and subject to the lower power limit. For all 60-meter transmissions, emission bandwidth is limited to 2.8 kHz or less and amateurs must not cause harmful interference to, and must accept interference from, stations authorized by the United States (NTIA and FCC) and other nations in the fixed service; and all other nations in the mobile service (except aeronautical mobile).

40 meter band (7.0-7.3 MHz)

The 40-meter band provides excellent regional and continental coverage with reliable propagation characteristics. It's particularly effective for nighttime communication across North America and between continents during favorable conditions. The band supports all emission types and is popular for both ragchewing and DXing.

ITU region differences affect 40-meter operations. Novice and Technician licensees outside ITU Region 2 may use CW only between 7.025 and 7.075 MHz and between 7.100 and 7.125 MHz. 7.200 to 7.300 MHz is not available outside ITU Region 2. These variations require careful attention when operating mobile or portable in different regions.

30 meter band (10.1-10.15 MHz)

The 30-meter band is a narrow but highly efficient band for DX communications. It's exclusively allocated for CW and digital modes, making it a favorite for operators interested in these modes. The 30-meter band is known for its excellent long-distance capabilities, particularly for digital and CW communications. Its limited bandwidth and mode restrictions help maintain a low noise level, making it ideal for weak-signal work.

20 meter band (14.0-14.35 MHz)

The 20-meter band is one of the most popular bands in amateur radio, especially for long-distance (DX) communications. It offers excellent daytime and evening propagation characteristics and is a favorite for worldwide communication. The 20-meter band is highly versatile, supporting a wide range of activities from casual chatting to contesting and emergency communications. Its global reach makes it a prime band for fostering international friendships and cultural exchange.

The 20-meter band often provides reliable daytime propagation paths around the world, making it ideal for international communication during business hours. During periods of high solar activity, the band remains open well into the evening hours, extending communication opportunities.

17 meter band (18.068-18.168 MHz)

The 17-meter band fills the gap between 20 and 15 meters, often providing communication opportunities when the higher bands are closed and the lower bands are too noisy or crowded. This WARC band (World Administrative Radio Conference) is not available for contest operation, making it ideal for casual QSOs and ragchewing.

15 meter band (21.0-21.45 MHz)

The 15-meter band responds dramatically to solar cycle variations. During solar maximum periods, it provides exceptional worldwide propagation with modest power levels. The 12-meter band, while narrower than many other HF bands, is known for its excellent long-distance capabilities during periods of high solar activity. It's a band that can offer surprising DX contacts. General license holders can enjoy the 12-meter band's unique propagation characteristics, which can lead to unexpected and exciting communication opportunities, especially during solar peaks.

12 meter band (24.89-24.99 MHz)

The 12-meter band, another WARC band, offers unique propagation characteristics that can surprise operators. During periods of enhanced solar activity, it can provide excellent long-haul communication paths. Like other WARC bands, it's excluded from contest operation, preserving it for casual communication.

10 meter band (28.0-29.7 MHz)

The 10-meter band is one of the most versatile and exciting bands available to General license holders. It offers a wide range of operating modes and is known for its dramatic propagation changes, making it a favorite for both local and long-distance communications. The 10-meter band is particularly interesting due to its responsiveness to solar activity, which can dramatically affect its propagation characteristics. During solar maximums, this band can support worldwide communication, while during solar minimums, it's more suited to regional communications.

This is the highest of the HF bands - or is it the lowest of the VHF bands? It has properties of both that make it unique: During band openings, it seems as though one may communicate almost anywhere in the world with even the lowest transmitter power. When the band is closed, however, it is strictly a "local" band.

VHF and UHF Amateur Bands

Frequencies between 30 and 300 MHz are referred to as Very High Frequency (VHF) region and those between 300 MHz and 3 GHz are referred to as Ultra High Frequency (UHF). Frequencies between 30 and 300 MHz are referred to as Very High Frequency (VHF) region and those between 300 MHz and]]>7Tue, 31 Mar 2026 05:58:36 +0000