Why Signal Quality Matters

In amateur radio, a strong signal is only half the equation. Audio clarity, proper RF output, and clean operating practices determine whether contacts are enjoyable — or a struggle. Whether you're working DX, joining a net, or contesting, these tips will help you put the best signal possible on the air.

Antenna First: The Biggest Impact

1. Optimize Your Antenna Before Everything Else

No amount of radio equipment upgrades will compensate for a poor antenna. An antenna that's too short, improperly fed, or mounted in a bad location will consistently underperform. Focus here first:

  • Raise your antenna as high as practically possible
  • Ensure your feedline is properly matched (check SWR with an antenna analyzer)
  • Move antennas away from metal structures, gutters, and power lines
  • Consider a simple wire dipole — it's hard to beat the performance-to-cost ratio

2. Use Quality Feedline

Cheap, lossy coaxial cable can eat your signal before it ever reaches the antenna. For HF, LMR-400 or equivalent low-loss coax is worth the investment, especially on runs longer than 50 feet. Check connectors for corrosion — a bad PL-259 can cause more loss than a long coax run.

Transmitter and Audio

3. Set Your Transmit Audio Correctly

Over-driven audio is one of the most common problems on SSB. If your microphone gain is too high, you'll generate splatter — distortion that bleeds into adjacent frequencies and makes you sound bad. Set your microphone gain so your ALC meter barely moves on voice peaks, not pegged at maximum.

4. Use a Good Microphone

The stock desk microphone included with many transceivers is adequate, but a quality aftermarket mic designed for ham radio (such as offerings from Heil Sound) can produce noticeably clearer audio. This especially matters for SSB and AM operation.

5. Position the Microphone Correctly

Talk across the microphone, not directly into it, to reduce plosive sounds (the "pop" from P and B sounds). Keep a consistent distance of a few inches. Avoid cupping a handheld mic — it creates a boomy, unclear sound.

RF and Power

6. Keep Your SWR Low

High SWR (above 2:1) causes your radio to reduce output power automatically and can stress your finals over time. Use an antenna tuner to present a better impedance match to the transceiver, but remember — a tuner fixes the mismatch at the radio, not at the antenna. A well-designed, resonant antenna is always the goal.

7. Run Only the Power You Need

More power is not always better. Running 100 watts when 25 will reach the other station wastes energy and increases your chances of creating interference. This is especially true on VHF/UHF repeater systems — a 5-watt HT is plenty for most repeater contacts.

Operating Practices

8. Listen Before Transmitting

The oldest rule in radio: listen first. Check that a frequency is clear before calling CQ or responding to a signal. On HF, check both above and below your intended frequency — nearby activity can interfere even if it sounds clear to you.

9. Speak Clearly and at a Moderate Pace

Especially in poor band conditions, slow down. Many operators rush through call signs and exchanges. A deliberate, clear delivery means fewer repeats and a more efficient QSO. Use the phonetic alphabet (Alpha, Bravo, Charlie…) when giving your call sign or other critical information.

10. Reduce RF Noise in Your Shack

Switching power supplies, LED lights, and computer equipment can all generate RF noise that degrades your receive capability and sometimes your transmitted signal. Use ferrite chokes on power supply leads and USB cables, and consider a dedicated linear power supply for your transceiver.

A Note on Signal Reports

The RST system (Readability, Strength, Tone) is the standard for signal reports. On phone, you'll give RS reports (e.g., "59" for perfectly readable and very strong). Be honest with your reports — a genuine "56" is more useful to the other operator than a courtesy "59."