[AMRadio] re: Apache audio not good

[Gary Schafer]

With a feedback circuit it is best to limit the frequency response at the high
and low end of the feedback loop. This limits the amount of phase shift in the
feedback circuit that can cause oscillation.

73
Gary  K4FMX


AA8TV at aol.com wrote:

> Hi Russ,
>
> One trick I used on the negative feedback circuit for my DX-100 was to do the
> voltage dividing first, and then de-couple the dc with a cap. This way the
> cap is a 50 volt part rather than a 1000 volt part. You can use a 100uf 50v
> electrolytic if you want to, it's easy on the pocket, and physically small. A
> 100uf plus cap also helps in adding feedback on the low audio frequencies.
> The Apache uses the same mod iron as the DX-100. They both have a 500 ohm tap
> to use for the negative feedback. I'll bet this would work in the apache as
> well.
>
> 73, Ed
> AA8TV
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