[Elecraft] Setting bias current on KPA-100

Sun Aug 18 19:19:00 2002

Hi Doug,

I found the bias setting to be fairly critical. I had a problem
with the KPA becoming very unstable on SSB and spent
a lot of time bugging Gary. Finally turned out to be the bias
adjustment which I had originally set with an old analog
VOM with very poor current resolution.

73,
Doug
W6JD

----- Original Message -----
From: "Doug Person" <[email protected]>
To: <[email protected]>
Sent: Sunday, August 18, 2002 10:05 AM
Subject: [Elecraft] Setting bias current on KPA-100

> How important is it to set the bias current accurately.  None of my meters
> seem to do very well in the necessary range.  They all tend to go 0 to
200ma
> and then jump to 10 amps.  At the higher setting resolution isn't very
good.
> I think I'm OK and near enough but wonder whether to err over or under.
>
> I also notice that KPA is very sensitive to SWR.  It starts to back down
> power at 1.5:1 or more.  Are the finals really that sensitive?  I notice
too
> that the fan doesn't seen to run much.  Is it better to set it so it runs
in
> slow all the time? Or is it fine to just leave it in the normal position?
>
> Doug -- W4DXV
> K2/100 #1920 K1/4 #1297
>
> _______________________________________________
> Elecraft mailing list: [email protected]
> You must be a list member to post to the list.
> Postings must be plain text (no HTML or attachments).
> See: http://mailman.qth.net/mailman/listinfo/elecraft
> Elecraft Web Page: http://www.elecraft.com
>