KPA500 reduced recieve signal

[Harry W4HWD]

When I switch the amplifier from Standby to Operate, I see and hear a
noticeable reduction in received signal strength, both on the S-meter and in
my headphones. Signal strength goes back up when I switch from Operate back
to Standby. *Seems to only do it in DATA A mode*. No change on CW. Any ideas
why? Rig is a K3S, using enhanced mode cables, if that matters.

Harry W4HWD




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[Bob McGraw - K4TAX]

Is your receive bandwidth changing between modes?  I wouldn't think
changing the amp would affect the receiver.   I'd say a more careful
evaluation would determine the T/R switch in the amp is the culprit.

73

Bob, K4TAX

On 1/28/2020 6:46 PM, Harry W4HWD wrote:

> When I switch the amplifier from Standby to Operate, I see and hear a
> noticeable reduction in received signal strength, both on the S-meter and in
> my headphones. Signal strength goes back up when I switch from Operate back
> to Standby. *Seems to only do it in DATA A mode*. No change on CW. Any ideas
> why? Rig is a K3S, using enhanced mode cables, if that matters.
>
> Harry W4HWD
>
>
>
>
> --
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I just had this happen with an Alpha that I was bringing out of retirement.  Turned out to be dirty relay contacts in the signal path. I can't imaging what would be unique in the amp about data mode. I wouldn't  think the amp would even know. Good luck tracking it down. It's probably something simple.

73,
Bill WE5P

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On Jan 28, 2020, 20:25, at 20:25, Bob McGraw K4TAX <[hidden email]> wrote:

>Is your receive bandwidth changing between modes?  I wouldn't think
>changing the amp would affect the receiver.   I'd say a more careful
>evaluation would determine the T/R switch in the amp is the culprit.
>
>73
>
>Bob, K4TAX
>
>On 1/28/2020 6:46 PM, Harry W4HWD wrote:
>> When I switch the amplifier from Standby to Operate, I see and hear a
>> noticeable reduction in received signal strength, both on the S-meter
>and in
>> my headphones. Signal strength goes back up when I switch from
>Operate back
>> to Standby. *Seems to only do it in DATA A mode*. No change on CW.
>Any ideas
>> why? Rig is a K3S, using enhanced mode cables, if that matters.
>>
>> Harry W4HWD
>>
>>
>>
>>
>> --
>> Sent from: http://elecraft.365791.n2.nabble.com/
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]

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