Mike said:
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"The ALC lamp is simply not an acceptable substitute for microphone preamp
metering. Checking the signal quality at levels where the lamp is on
considerably more than just on voice peaks indicates no increase in IMD at
these higher microphone gain levels and much higher RMS output."
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Mike, your observation on the ALC light, when using Speech Processing, is
identical to my experience. I didn't mention that when I did the Speech
Processing
testing, but while the ALC light may be useful for initial setting the
microphone gain,
it is not useful when the speech processing is engaged. Lots of remote testing
has confirmed that the signal and speech quality is very good with the
speech processing at 7, 8 and 9. Their is no speech distortion or signal
splatter even though the ALC light is on significantly with the Speech
Processing on.
http://lists.contesting.com/archives//html/TenTec/2009-02/msg00075.html
73, Merle - W0EWM
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