What Is SSB and Why Does Ham Radio Use It?

Single Sideband (SSB) is the standard voice operating mode on HF amateur radio bands. Unlike AM broadcasting, which transmits a carrier wave and two sidebands, SSB suppresses the carrier and one sideband — making it roughly three times more power-efficient and half the bandwidth. For long-distance HF communication, this efficiency is crucial.

There are two variants: Upper Sideband (USB), used on 20m, 17m, 15m, 12m, and 10m; and Lower Sideband (LSB), used on 80m, 60m, and 40m. This is a convention, not a rule, but virtually everyone follows it.

Setting Up for SSB

Before you key up, make sure your station is properly configured:

  • Microphone gain: Set it so your audio meter peaks around 50–60% on voice peaks. Overdriving the mic creates splatter that interferes with nearby stations.
  • Compression: Speech compression can help readability on weak signals, but too much creates distortion. Start with it off.
  • Sideband selection: Match the convention for the band you're on (USB or LSB).
  • Frequency: Listen for a clear frequency before transmitting. Always ask "Is this frequency in use?" before calling CQ.

The Phonetic Alphabet

When exchanging call signs and information under poor conditions, use the ITU phonetic alphabet to spell letters clearly:

  • A – Alpha, B – Bravo, C – Charlie, D – Delta, E – Echo
  • F – Foxtrot, G – Golf, H – Hotel, I – India, J – Juliet
  • K – Kilo, L – Lima, M – Mike, N – November, O – Oscar
  • P – Papa, Q – Quebec, R – Romeo, S – Sierra, T – Tango
  • U – Uniform, V – Victor, W – Whiskey, X – X-ray, Y – Yankee, Z – Zulu

Making a CQ Call

A "CQ" call is an open invitation for any station to reply. A standard CQ sounds like this:

"CQ CQ CQ, this is Whiskey One Alpha Bravo, Whiskey One Alpha Bravo, calling CQ and standing by."

Keep CQ calls short (two to three repetitions of CQ, your call sign once or twice), then listen. If no reply after 30 seconds, try again or move to a different frequency.

Responding to a CQ

When you hear a station calling CQ, respond with your call sign only:

"Whiskey One Alpha Bravo, this is Kilo Four X-ray Yankee Zulu."

Don't give a lengthy introduction on the first call — just your call sign clearly. Let the other station acknowledge you and begin the exchange.

A Typical SSB QSO Exchange

  1. Exchange signal reports using the RS system (Readability 1–5, Strength 1–9). "59" means perfect copy at strong signal strength.
  2. Give your name and location (QTH).
  3. Mention your antenna and rig if the contact asks or if it's relevant.
  4. Wrap up with "73" (best regards) and confirm the other station's call sign.

On-Air Etiquette

  • Don't tune up on a busy frequency. Use a dummy load or find a clear spot first.
  • Give way to DX stations. If a rare DX entity is on frequency, keep your transmissions short and relevant.
  • Identify every 10 minutes and at the end of each transmission as required by FCC rules.
  • Don't double — if two stations call simultaneously, let one finish before transmitting again.

Practice Makes Permanent

The best way to improve your SSB operating is simply to get on the air regularly. Consider joining a local club net or a regional HF net — these scheduled on-air meetings provide a friendly, structured environment for new operators to practice. Most experienced hams are patient and welcoming to newcomers.