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Re: [Amps] AL1200 weak receive

To: Mark Bitterlich <>
Subject: Re: [Amps] AL1200 weak receive
From: Curt Nixon <>
Date: Fri, 29 Jul 2022 18:38:45 -0400
List-post: <>
This works but better know what you are doing because Amp will be powered
up with b+ do it.  KU8L

On Fri, Jul 29, 2022, 6:09 PM Mark Bitterlich via Amps <>

> You could also go to "operate" and verify that the voltage is the same on
> both sides of the relay.  If it is NOT the same, you've got a path to
> ground that is partially pulling the relay in. Yes, just a WAG, but if you
> feel the relay contacts and spring are both good, this is all it can
> be. Famous last words. Markwa3jpy
> -------- Original message --------From: Mark Bitterlich <
>> Date: 7/29/22  5:45 PM  (GMT-05:00) To:
> "Ed Swiderski, KU4BP" <>, Cc:
> Subject: RE: [Amps] AL1200 weak receive 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" <> Date: 7/29/22  12:33 PM
> (GMT-05:00) To: 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.com
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