Mathew Quaife wrote:
>The one user is going to bring his radio by and see just what it is doing
>audio wise, it might be set to high to begin with, and with him having a
>loud voice, might be just over doing it all.
>
While you *may* find the users radio to be "too wide" (too much
deviation), it has been my observation that users that sound too loud
are due to them using radios that have too much Microphone Gain (gain
before the clipper/filter, and deviation control). Also, don't be
surprised that you can't find a control to fix the problem, many of the
newer radios don't have one. My Kenwood 742A has been modified inside
the microphone with the addition of a pot in the audio line. When using
this approach you must be cautious of the place that you install to
control as you can affect the DTMF tone level. In my case, there was no
good place to install the pot near the mic element because of the bias
voltage on the element. While I could have decoupled the audio and
steered the bias around the pot, there physically wasn't enough room in
the mic to do that easily. I opted to simply place the added pot in the
audio line after the DTMF was mixed in. Since the DTMF encoder has a
control to set its level, and its output is fairly hot, I was able to
turn down the mic element and reset the level of the DTMF encoder to the
desired amount(s).
Hope this helps...
Kevin Custer
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