Here is a simple mod for improved audio on the Omni C. I have not
tested it on other Omni series such as A, B, D etc. but most likely it
would have the same effect. It gives a boost to voice frequencies and
a slight peak around 600-700hz for cw. All signals seem to be much
easier to copy with the now brilliant sounding audio.
Parts needed.........1ea. 1 meg resistor
Remove bottom cover of rig.
Locate the audio-sidetone board. This is the one with the sidetone
pots.
There is no need to remove the board. Solder the resistor between pin
2 of IC-1 (LM-380) and AF-Output.
Instead of soldering directly to pin 2 of IC-1, you may want to solder
to R8's (10K) lead which connects to pin 2 and the other end to C11's
negative lead. I suggest sliding some insulation over the 1 meg
resistor's leads to prevent shorting.
Replace the bottom cover and enjoy.
73
Steve N4LQ
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