jcharley@bellsouth.net wrote:
> Has anyone tried Steve's Audio Mod for the Omni C? What do you think?
> I did his AGC Mod for the Omni C and it works great.
> I sometimes have to have the RF and AF gain at full Clockwise position to
> hear adequately. The unit has been back to factory for PTO rebuild,
> alignment and check out. So all should be okay, otherwise.
> Your thoughts.
> 73/Crit/K4BXN
>
> *** QUOTE from 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
>
> *** End Quote ***
>
>
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>
I tried it on an Omni A, worked great. But on the Omni C I noticed some
whine from the digital display. YMMV
Ed W3NR
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