[Amps] AL1200 weak receive

[gudguyham at aol.com]

Once again the relay is engaging in operate because the ptt line is shorted or closed by radio.  Do you see plate idle current?


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On Friday, July 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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