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
- 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