G2A: Phone Operating Procedures – Ham Radio General License Study Guide

G2A covers the conventions and procedures General class operators use for voice communication on HF. SSB is the dominant mode on HF phone, and understanding which sideband is used on which bands — along with how SSB works, how to configure a transceiver, and how to behave on the air — is the foundation of HF operating.

The exam draws from topics including the standard sideband for voice operation on various HF bands and on VHF/UHF, the characteristics and advantages of SSB, how ALC is set on an SSB transceiver, how VOX operation differs from PTT, the correct way to break into a phone contact, why lower sideband is used on 160/75/40 meters, and who should respond to a CQ DX call from a station in the contiguous 48 states.

SSB Sideband Conventions by Band

Amateur operators use different sidebands depending on the band. These conventions are not FCC regulations — they are commonly accepted amateur practice that has become standardized worldwide. Knowing them is essential for making contacts, since an operator on the wrong sideband will produce garbled audio to stations using the correct sideband.

The reason for using lower sideband on 160, 75, and 40 meters is simply that it is commonly accepted amateur practice — not a technical superiority of LSB at low frequencies, and not an FCC requirement. Historical convention established LSB on the lower HF bands, and operators have maintained that convention ever since.

How SSB Works

Single sideband is a form of amplitude modulation in which the carrier and one sideband are suppressed before transmission. Only one sideband is actually transmitted. This is the defining characteristic of SSB: both the carrier and the opposite sideband are removed. Compare this to standard AM, which transmits the carrier and both sidebands — SSB eliminates two-thirds of the signal components, concentrating all transmitter power into the single sideband that carries the voice information.

The practical benefits of SSB compared to other analog voice modes on HF are less bandwidth used and greater power efficiency. A typical SSB signal occupies about 2.4 kHz, compared to 6 kHz for AM. And since power is not wasted on the carrier or the second sideband, the full transmitter output goes into the voice-carrying sideband. SSB is the most commonly used voice mode on HF amateur bands because of these advantages.

Transceiver Setup: ALC and VOX

Automatic Level Control (ALC) prevents overmodulation and excessive transmitter output power by sensing the signal level and reducing gain when it rises too high. On an SSB transceiver, ALC is set by adjusting the transmit audio level or the microphone gain. Speaking too loudly or setting the mic gain too high causes the ALC to compress the signal heavily, producing audio distortion and excessive bandwidth. The ALC meter on the transceiver shows the current ALC action — the goal is to allow ALC to operate only slightly during normal speech peaks, not continuously.

VOX (voice-operated transmission) automatically switches the transceiver from receive to transmit when the microphone picks up audio above a threshold. The primary advantage of VOX compared to PTT (push-to-talk) is that it allows hands-free operation — the operator does not need to hold a switch or press a button while talking. This is especially useful during logging, typing, or other tasks that occupy both hands.

On-Air Procedures

When you want to join a conversation already in progress, the correct method is to say your call sign once during a pause in the conversation. You do not say "Breaker Breaker," send "CQ," or repeat your call sign multiple times. One brief transmission with your call sign identifies you and signals your intent to join. The stations in the QSO can then acknowledge you and invite you into the conversation.

DX Operating Etiquette

When a station in the contiguous 48 states transmits "CQ DX," it is specifically calling for stations outside the lower 48 states — DX stations. Any station outside the lower 48 states should respond: this includes Alaska, Hawaii, US territories, and of course foreign stations. Stations within the contiguous 48 states should not respond to a CQ DX call from another station in the same area, as the calling station is explicitly not looking for local contacts.

G2A Practice Questions