I'm working on a 42-50 MHz MaraTrac with the A7
advanced head that has a squelch pot on it. The
squelch is open all the time, and neither the control
head pot or the pot inside the radio will close the
squelch. The radio does go quiet if I program TPL/DPL
on the channel and ground the mike hang-up button. The
service manual I was able to look at didn't have
anything about this remote squelch pot in it.
Does anyone have a MaraTrac manual that HAS the
squelch pot details in the control head? I'd need info
about the wiring inside the radio. I was able to trace
one side of the pot to pin 9 of the radio end of the
control cable, and I can see a varying resistance
value there (to ground) when I rotate the pot. From
that point on it's a mystery. I suspect a problem on
the audio interface board. I don't know if this
particular control head and cable belongs with this
radio.
I will pay for copies of the appropriate sheets.
Please let me know privately if you can help.
Thanks.
Bob M.
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