[Amps] AL1200 weak receive

[gudguyham at aol.com]

Based on your explanation there’s a short in the antenna relay line.


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On Friday, July 29, 2022, 5:19 PM, donroden at hiwaay.net <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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