G1C: Power and Emission Standards – Ham Radio General License Study Guide

G1C covers the FCC rules that govern how much power amateur stations may transmit and how that power is measured, along with special requirements for 60-meter operation and the rules for using new digital protocols.

The exam draws from topics including the specific power limits for the 30-meter, 12-meter, 10-meter, and 160-meter bands, the maximum bandwidth for USB emissions on 60 meters, the record-keeping requirement for non-dipole antennas on 60 meters, what must be done before using a new digital protocol on the air, and how the FCC specifies the measurement of maximum power.

How the FCC Measures Power

The FCC regulates amateur station power using a specific measurement: peak envelope power (PEP) output from the transmitter. This is neither RMS output, input power to the transmitter, nor power delivered to the antenna — it is the peak envelope power measured at the transmitter's output port. PEP reflects the highest power level reached during a modulation cycle, making it the appropriate measurement for voice and other envelope-modulated modes where instantaneous power varies continuously.

Understanding the measurement basis matters when evaluating whether a station is within its power limit. An operator cannot point to average power or input power to justify a higher PEP output. The PEP output from the transmitter is the controlling figure.

Power Limits by Band

Maximum transmitter power varies significantly across the HF bands. Most bands permit 1500 watts PEP output, but several have lower limits:

The 30-meter band stands out as the special case: while most HF bands allow up to 1500 watts PEP, 30 meters is capped at 200 watts PEP. This is a consequence of the 30-meter band's secondary allocation status — amateurs share the band with fixed service stations and must operate with reduced power. The 12-meter and 10-meter bands allow the full 1500 watts PEP for General class operators. The 160-meter band also permits 1500 watts PEP.

60-Meter Special Requirements

The 60-meter band (near 5 MHz) is allocated to amateurs as a secondary service on five specific channels, and it carries special operating requirements that do not apply to other HF bands:

Bandwidth limit: Amateur stations transmitting on USB frequencies in the 60-meter band are limited to a maximum bandwidth of 2.8 kHz. This narrow bandwidth requirement reflects the channel-based nature of the 60-meter allocation and the need to coexist with primary service users.

Antenna gain record-keeping: If you are using an antenna other than a dipole on the 60-meter band, you must keep a record of the gain of that antenna. This requirement exists because the 60-meter allocation sets power limits in terms of effective radiated power relative to a dipole. Using a higher-gain antenna effectively increases ERP, so the FCC requires a gain record to allow compliance verification. No such requirement applies if the antenna is a dipole, since a dipole is the reference antenna itself.

New Digital Protocols

Amateur operators who want to use a new digital protocol that has not previously been used on the air must publicly document the technical characteristics of that protocol before transmitting. This requirement ensures that the protocol is not obscuring message content in a way that would violate the prohibition on messages intended to be unintelligible to other amateurs. Public documentation — posting the protocol's specifications so that other operators can understand how it works — satisfies this requirement.

What is not required before using a new digital protocol: type certification of equipment to FCC standards, obtaining an experimental license from the FCC, or submitting a formal rulemaking petition. The rule is straightforward — document the protocol publicly, then use it.

G1C Practice Questions