[Elecraft] KPA100 with a bad attitude

David A. Belsley David A. Belsley" <[email protected]
Wed Oct 8 00:04:00 2003


Dwayne:
  Sure sounds like the KPA100 is not running as a linear.  Have you double 
checked the bias setting?

best wishes,

dave belsley, w1euy

--On Tuesday, October 7, 2003 8:43 PM -0500 Dwayne Walker 
<[email protected]> wrote:

> HI Group
>
> Used the K2 a few mornings ago for my CW practice and got some
> interesting reports. First off in SSB I got a claim that the audio was
> weird, a little muffled. All in all I have not decided what to make of
> this, it could have easily been just listening preference of the station.
> He was used to hearing me on an Icom 706 I figure that there is a
> difference.
>
> Then after a couple of rounds of CW at about 90w it just quit
> transmitting. No messages that I saw, and no change in audio from the
> rig. but it would not transmit CW none of the led's would light as I
> keyed the paddle either. after I turned the power down to below 11w
> switching out the PA then it worked, and after switching the PA back on
> by turning it back up in power it transmitted just fine for the rest of
> the session.
>
> After the session there was a short rag chew on SSB near the end of it I
> got reports that all of the sudden none of the other stations could
> understand me any more. they could hear a horrible muffled signal but
> could not even make out my call sign. One station actually called me up
> on the phone just to make sure that I could hear them. After a bit of
> conversation on the phone I reached up and turned down the power to 9.5w
> and made a call out to the other station. he told me that the audio was
> great and perfectly readable.
>
> I basically ended there as I had to go to work but I did get a chance to
> look over the web site and the Elecraft reflector archives but I could
> not find any thing like this. One ham had a audio distortion problem on
> 10m only but it exhibited different properties than my problem. no one
> replied on the reflector to his comment.
>
> Any suggestions would be welcome.
>
> Dwayne 73
>
> P.S. the serial number is 3403 and it has the noise blanker, SSB, audio
> filter, and 160 options. As well as the KPA100 of course.
>
>
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----------------------------------
David A. Belsley
Professor of Economics