Try unplugging the PTT line from the amp and see if the problem goes away.
Sounds like when you are going to "operate" on the front panel, there is a path
to ground from the relay coil. Either inside the amp, or the PTT cable going to
the radio. To confirm you could unsolder one side of the relay coil, etc.
Markwa3jpy
-------- Original message --------From: "Ed Swiderski, KU4BP"
<ku4bp@triad.rr.com> Date: 7/29/22 12:33 PM (GMT-05:00) To:
amps@contesting.com Subject: [Amps] AL1200 weak receive I have a confusing
problem with my AL1200. During operation when the stdby/oper is on, the
received signal is very weak. Switching back to standby and the signal level is
fine. Checked the relay and it was operating correctly. Engaging with 12v
applied to it. With no power to the amp and a rx signal going through, manually
engaging the relay weakens the signal. Releasing it and it's back to normal.
Cleaned the contacts using the method described by W8JI on his site. Still no
go. Stumped on where to look next to track this down. A tests on another radio
produced the same results.With no power to the amp, I connected my RigExpert
analyzer to the "RF in" and a dummy load to "RF out". Doing a sweep, the SWR
reads around 1:1. Engaging the relay by hand shoots the SWR very high. Goes
back down when released.That's the best symptoms I can give. Any suggestions
would be an immense help.Thank you,Ed
KU4BP_______________________________________________Amps mailing
listAmps@contesting.comhttp://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|