--- In [email protected], Kevin Custer <[EMAIL PROTECTED]>
wrote:
>
> Hi John,
>
> I doubt that the problem lies in the controller, but rather your
> 'modulator' isn't flat. If you scope the audio path, you should be
able
> to make sure that you don't have excessive roll-off or distortion
in the
> audio chain.
>
> My suggestion is to change the exciter to provide True FM. This
can be
> done by adapting a Mastr II PLL ICOM and installing it into the MVP.
> The AP-50 is a nice solution to feeding discriminator audio to the
FM ICOM.
>
> While this article isn't written around the MVP, it can be
generically
> followed to do what I have explained:
> <http://www.repeater-builder.com/ge/mastrII/ap-50-fm-mastr2.html>
>
> If I were doing this, I would feed Vol/Sq high to the AP-50 *and*
the
> controller, using a simple resistive splitter. Have the controller
> there to do all of your necessary functions for control, but not
run the
> audio through the controller to be repeated. I would modify the
> controller so it couldn't pass audio, by removing the gate
transistor.
> This will allow you to feed audio to the controller for processing
of
> tone commands. The AP-50 would take Vol/Sq high and feed it
directly to
> the FM ICOM. Set the AP-50 so it doesn't de-emphasize, or pre-
emphasize
> the audio. Take the audio output of the controller and feed it to
the
> CTCSS port of the AP-50 so the responses of the controller can be
> heard. This will insure that the audio is not muted and the least
> amount of *stuff* exists in the audio path, but still having the
> necessities.
>
> Kevin
>
Hello Kevin.
Well, you answered my question. I think that is the way to go. What
do you suggest for a configuration for the resistive splitter? I have
done that in the past with a couple of 10k resistors but that was
just luck that it worked. I am not sure how to do it the right way.
I will be in touch on the AP-50. Now off to find some PLL channel
elements!
Thanks again. John
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