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high input SWR KPA500

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Steef PA2A

high input SWR KPA500

Hi,
since this afternoon my KPA500 has a very high input SWR on all bands
and there is no output. What might be the problem? I can 't find the
schematics.

73s Steve PA2A
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John Simmons

Re: high input SWR KPA500

Are you using a K3(s)? Are you sure the rig isn't switched to ANT2 by
mistake?

-John NI0K

> Steef PA2A <mailto:[hidden email]>
> Friday, February 08, 2019 1:47 PM
> Hi,
> since this afternoon my KPA500 has a very high input SWR on all bands
> and there is no output. What might be the problem? I can 't find the
> schematics.
>
> 73s Steve PA2A
> ______________________________________________________________
> 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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Steef PA2A

Re: high input SWR KPA500

John,

it is the same with all transceivers. In standby everything is OK and
input power is shown on the KPA screen. But in operating mode the signal
blocks somewhere. The RF of the TS590S doesn 't even switch the band
filters of the KPA while it does switch them in standby mode. I suspect
the input relay or circuit. There may have been DC in the coax line
caused by a remote beverage switch.

The amp shows 0.5 Ampere current when PTT is applied. Not very much so
there may be more trouble.

CU all in the PACC, starting within a few hours!

73s Steve PA2A

John Simmons schreef op 2019-02-09 04:38:

> Are you using a K3(s)? Are you sure the rig isn't switched to ANT2 by
> mistake?
>
> -John NI0K
>
>> Steef PA2A
>> Friday, February 08, 2019 1:47 PM
>> Hi,
>> since this afternoon my KPA500 has a very high input SWR on all
>> bands and there is no output. What might be the problem? I can 't
>> find the schematics.
>>
>> 73s Steve PA2A

Elecraft mailing list

Re: high input SWR KPA500

The DC should not have done anything - the KPA blocks it at its input. But the excess power apparently did quite a bit of damage. Call the tech support guys on Monday.

Good luck in PACC. Most of us contest types in this area (Northern California) are operating WPX-RTTY this weekend.

73!
Jack, W6FB

> On Feb 8, 2019, at 11:50 PM, Steef PA2A <[hidden email]> wrote:
>
> John,
>
> it is the same with all transceivers. In standby everything is OK and input power is shown on the KPA screen. But in operating mode the signal blocks somewhere. The RF of the TS590S doesn 't even switch the band filters of the KPA while it does switch them in standby mode. I suspect the input relay or circuit. There may have been DC in the coax line caused by a remote beverage switch.
>
> The amp shows 0.5 Ampere current when PTT is applied. Not very much so there may be more trouble.
>
> CU all in the PACC, starting within a few hours!
>
> 73s Steve PA2A
>
> John Simmons schreef op 2019-02-09 04:38:
>> Are you using a K3(s)? Are you sure the rig isn't switched to ANT2 by
>> mistake?
>> -John NI0K
>>> Steef PA2A
>>> Friday, February 08, 2019 1:47 PM
>>> Hi,
>>> since this afternoon my KPA500 has a very high input SWR on all
>>> bands and there is no output. What might be the problem? I can 't
>>> find the schematics.
>>> 73s Steve PA2A
> ______________________________________________________________
> 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]