Omni Series C Audio Mod

From the Ten-Tec Reflector September 19, 1999

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

  1. Remove bottom cover of rig.
  2. Locate the audio-sidetone board. This is the one with the sidetone pots. There is no need to remove the board.
  3. 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.
  4. I suggest sliding some insulation over the 1 meg resistor's leads to prevent shorting.
  5. Replace the bottom cover and enjoy.

73 Steve N4LQ

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