I (and many others) have exactly the same power variation. I just recently
changed R99 to 1.1K and that reduced the variation in power to the point
that I no longer notice the variations. A check of maximum power output
shows that I still get normal performance on all bands.
Don K7FJ
No, that didn't help, Stewart. With the 100 PA disconnected and 5 watts
requested, I see around 0.5 w difference in actual power and that is
stable.
Having re-connected the 100 w pa to restore the K2/100 to the state I
would normally use it, I have put a scope on the output. With requested
power of 50w, in Tune the readout shows 29w immediately, dropping to 24,
21 and 17w, it then toggles between 17 and 22w. I can see this stepping on
the waveform displayed on my scope. It also explains what I was seeing
the other night. Since I was working pile-up style, the overs would be
short, so each time I went to transmit the power variation in the K2 would
also vary drive to the amp with the consequent output variation of between
100 and 200 w from the amp.
Chris G3SJJ
Stewart Baker wrote:
Chris,
Take a look here... http://www.elecraft.com/Apps/Power_Control_Mod.html
73
Stewart G3RXQ
On Wed, 27 Dec 2006 14:07:24 +0000, G3SJJ wrote:
I am sure I have seen a discussion about this one before. During an
enjoyable 160m opening to the Right Coast just before Christmas I was
running a few Stateside stations and noticed a definite output power
variation coming from my Acom 1000 which was being driven by the K2. I
would guess that the drive power was varying between 30 and 50 watts.
Any thoughts on this?
K2/100 5545 bought at Dayton this year, completed in September.
Chris G3SJJ
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