While my K3 seems to have some issues on other bands, it performed
flawlessly this weekend on 160. While the SWR of my antenna ranges up to
2:1, the internal ATU kept it below 1.2 across the band. The output
remained between 1400 and 1500 W across the band, and didn't drop
significantly as the temperature rose. The current was quite high, 54-56
A, and the temperature stabilized at about 70 C during long runs.
On other bands, I've noticed a drop in output as the temperature rose,
and the ATU doesn't always keep the SWR that low. While I can't rule out
something changing in the antennas, it has happened with several
antennas, and I've never seen any fluctuation in SWR of any of them. I
don't have a dummy load capable of a long term test, but surely Elecraft
has run such tests. It would be interesting to see the results of a long
term test with, say, a 2:1 load SWR.
73,
Scott K9MA
--
Scott K9MA
[hidden email]
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