[Amps] AL1200 weak receive

[Ed Swiderski, KU4BP]

It's the original

On 7/29/2022 6:44 PM, Curt Nixon wrote:
> Ed..does your Amp have the original 3 pole relay or is it the new 
> version circuit board "functional identical" as indicated on the 
> schematic?   If it is the board model, it might have multiple relays 
> where the board may have failed or one of the individual relays may be 
> faulty.
>
> On Fri, Jul 29, 2022, 6:12 PM Ed Swiderski, KU4BP <ku4bp at triad.rr.com> 
> wrote:
>
>     Forgive my ignorance but I thought it was to put the amp in circuit.
>     Which it does because power is output. Unkeying the amp and the
>     receive
>     is weak. When the op switch is on.
>
>     On 7/29/2022 5:13 PM, donroden at hiwaay.net wrote:
>     >
>     > Isn't that the way the relay is supposed to work ?? W4DNR
>     >
>     >
>     >
>     > On 2022-07-29 11:30 am, Ed Swiderski, KU4BP wrote:
>     >
>     >> 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
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