Thanks Don, there is no instability apparent on a scope or spec an. I've
already done the R4 and RFC3 mods as per latest errata, which cured the 80m
instability for me. Unfortunately I'm not sure if this problem was always
there, or started when I did the pa upgrade
(screening/firmware/swr/R4&RFC3).
73 Fraser
From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]>
Reply-To: <[EMAIL PROTECTED]>
To: "Fraser Robertson" <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>
CC: <[email protected]>
Subject: RE: [Elecraft] K2/100 current consumption problem - update
Date: Thu, 3 Mar 2005 19:05:23 -0500
Fraser,
If you have a 'scope handy, try cranking the power up to 100 watts on 160
and 80 and observing the CW envelope - if you see what looks like weak
modulation on the top and bottom of the envelope pattern, you have a low
frequency oscillation. If you do have that oscillation, the 'cure' has
been
discussed on this reflector - on the KPA100, put a 1K resistor across RFC3,
and change R4 from 100k to 39k.
I have worked on KPA100s having this modulation problem, but never related
it to current draw before, but it is worthy of investigation.
73,
Don W3FPR
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