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Best answer I have found for soft spoken
folks is the little mic preamp board used in some of the old GE Phoenix and MVS
radios. Little single stage amp that operated from bias on the mic line. I usually set the deviation limit for
voice at 4.0 Khz. And allow a little for tone/dcg. NEVER EVER USE THE TRANSMITTER DEVIATION
CONTROL TO MAKE UP FOR LACKING MIC GAIN. A soft spoken person may need a mic
preamp, or a more sensitive microphone. Beware of excessive mic gain competing
with ctcss and causing drop or talk down. A small swamping resistor might be
in order. Wish Helper still made the modulation density meter… SOP is to set a tone gen at around 50 mv
or enough to fully modulate the transmitter, and then set the deviation limit
to around +/- 4.0 Khz @ 1000 Hz. Tone. Using the IDC to boost mic gain will
lead to overmodulation and clipping out of the pass band of the receiver, not
to mention the joy you will bring to your adjacent channel neighbors. 2 cents and 30 years, Steve |
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