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Listening to various operators at different times, I've sometimes noticed, especially during contests, that some operators are easier to understand than others, and it doesn't all seem to be due to their speech patterns. The audio doesn't sound good but it's easy to understand.

At other times I've listened to two operators ragchew for longer periods of time, and while the audio is understandable, it is easier to listen to.

It seems to me that operators have a lot of control over how they sound over the air.

What makes these two sounds so different?

How do I adjust my transmitter to make these two sounds - one focused on intelligibility, and one focused on good/comfortable listening?

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3 Answers

Microphone technique has a good bit to do with clarity.

  • Talk across the mic, not directly into it, unless it is a noise canceling type designed to be used that way.

  • Speak no more than 2" away from the mic, even if it is a desk mic or a boom mounted type; many people make the mistake of thinking that just because they have a desk or boom mounted mic that they can sit back at arm's length (or more) and just turn up the gain on the transmitter. (No one wants to hear a lot of background noise unless necessary.)

  • Speak clearly and consistently (take a lesson from the professional radio announcers [not necessarily the DJs]); keep an even and level tone.

  • If your transmitter or transceiver has an "ALC" function as part of its metering system, watch that function while you are transmitting; keep your voice peaks within the ALC range on the meter, especially if using a compressor (about half scale or less is plenty).

  • Some of the newer rigs have equalizers built in; get with a friend who knows your natural voice to listen to you while you make adjustments to get the best sound.

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Eric Scace, K3NA wrote a two part article for the NCJ a few years back on all the adjustments you can make to your audio chain to improve it's quality.

While the article focuses on audio quality for contesting, I think most of the points are relevant "regular" phone contacts. He has 6 main areas that he addresses:

  • Operator training — Things like posture, speaking volume, how to speak into a microphone, etc.
  • Controls affecting the recording of audio signals — focuses on making your contesting macros sound as much like your normal phone as possible to make copying your messages smooth and easy.
  • Controls affecting the playback of message to the radio’s audio input jack — more on the above
  • Controls used for live speech routed through the soundcard.
  • Transmitter mic and speech processor level, and any other internal audio bandwidth, threshold, or equalizer settings.
  • Transmitter power output — making sure you don't ruin your hard work by using too much power and distorting the signal.

There's a full copy on his web site: http://www.k3na.org/articles/Transmit%20audio%20adjustment.pdf. Definitely a useful read.

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While this may in theory answer the question, it is better to summarize the main points within the answer itself so that the answer will still be valid if the linked article ever becomes unavailable for any reason. It also means that people don't need to go through a 15 pages long article to find the answer to the question. It might make a great reference, but it should not be the only part to your answer. –  Michael Kjörling Dec 12 '13 at 8:23
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I've found that precise enunciation works better for the former, whereas controlled modulation (consistent volume and slurring over twixt-word gaps) works better for the latter. Neither is is a function of the transmitter.

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I've noticed this two, but it doesn't all seem to be due to their speech patterns. –  Adam Davis Dec 11 '13 at 20:52
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