K2/100 RS-232 Noise

[David Fleming-4]

Hi all..



I've just completed the initial testing and alignment on the KPA100.
Everything checks out fine. All resistance and voltage measurements are
within spec and I'm getting 100+ watts out on all bands. However I'm
getting some annoying noise from the RS-232. My software polls the K2
every 250ms (4 times per second) and it generates noise on all bands
every time it's polled. It's coming through load and clear. It wasn't
there with the KIO2, so I suspect I may have a problem somewhere in the
KPA100 RS-232 circuitry. Is this a known problem, or do I have something
wrong? I can't find anything searching the archives.



Thanks..



-David W4SMT





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[Vic K2VCO]

David Fleming wrote:

> I've just completed the initial testing and alignment on the KPA100.
> Everything checks out fine. All resistance and voltage measurements are
> within spec and I'm getting 100+ watts out on all bands. However I'm
> getting some annoying noise from the RS-232. My software polls the K2
> every 250ms (4 times per second) and it generates noise on all bands
> every time it's polled. It's coming through load and clear. It wasn't
> there with the KIO2, so I suspect I may have a problem somewhere in the
> KPA100 RS-232 circuitry. Is this a known problem, or do I have something
> wrong? I can't find anything searching the archives.

The dress of the flat ribbon cable that goes to the KPA100 can have an
effect on noise pickup.  Try bunching it up close to the plug on the
control board and see if this helps.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Gregg W6IZT]

I once had this problem too. I traced the problem to the routing of the
ribbon cable from the K2 to the KPA100.

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of David Fleming
Sent: Monday, April 23, 2007 10:56 AM
To: [hidden email]
Subject: [Elecraft] K2/100 RS-232 Noise

Hi all..



I've just completed the initial testing and alignment on the KPA100.
Everything checks out fine. All resistance and voltage measurements are
within spec and I'm getting 100+ watts out on all bands. However I'm
getting some annoying noise from the RS-232. My software polls the K2
every 250ms (4 times per second) and it generates noise on all bands
every time it's polled. It's coming through load and clear. It wasn't
there with the KIO2, so I suspect I may have a problem somewhere in the
KPA100 RS-232 circuitry. Is this a known problem, or do I have something
wrong? I can't find anything searching the archives.



Thanks..



-David W4SMT





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