George Allgood wrote:
> Recently, I found a Century 21 and let it "follow me home".
> Rebuilt the PTO and cleaned her up a bit and now, she's working like a charm.
> I'd like to change the frequency of the sidetone. The sidetone is plenty
> loud enough,
> but the pitch is a bit low. The tone is generated from an IC on the pre-amp
> board.
> Has anyone done this?
>
> Thanks
>
> George, W4GFA
R1 controls the sidetone frequency. It will be either a 68k or a 47k. I
put a variable pot in temporarily to determine what I wanted. Measured
the pot and used a fixed value.
Ed W3NR
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