The first tasks on a list of things to do/check:
If the squelch pot isn't a sealed unit, spray some Caig Labs
DeOxit treatment into the body and rotate the shaft around
a few times, then reset the squelch level and see what happens
over time. Many of the Caig Labs Spray would probably work
very well. Get the ProGold G5 if the DeOxit isn't available.
If the squelch dies/stops working - pop a scope or multi
meter on the receiver squelch circuit to see the rectified
noise - dc level - threshold values all appear to be within
spec.
****
One other option (I'd probably skip over if I caught the circuit
not working with test equipment handy) is to use a hair dryer
(heat gun) and/or cool-freeze spray to try and tell if the
trouble is temp related.
cheers,
skipp
> "Dave VanHorn" <[EMAIL PROTECTED]> wrote:
>
>
> Our club 220 machine has been giving a lot of trouble with the squelch.
>
> The problem is that the squelch works fine for a while, then quits.
> By that I mean that it will not squelch even with no input signal at
> all. No real clues, and the schematic is not very helpful.
>
> Any ideas?
>
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