Posted by
Augie "Gus" Hansen on
Sep 14, 2004; 3:57pm
URL: http://elecraft.85.s1.nabble.com/K2-ATU-question-tp370291p370295.html
Hi Mike,
> Can't see the problem. I have a log periodic for 18-30MHz on ant-1 and a
> vertical for lower bands on ant-2. It does not matter if the atu stays in
> circuit and "tunes" the matched resonant antenna. Just the same as
> matching to the dummy load. My vertical is a good 50 ohm match on 10MHz
> but I also very occasionally press it into service on 7MHz where the ATU
> keeps the PA happy.
What you described is correct. However, a magnetic loop or other narrow-band
antenna that needs to be tuned to frequency should be run without an
auto-tuner in the transmitter. When an auto-tuner is engaged it is nearly
impossible to tune the loop correctly to resonance resulting in troublesome
matches that can stress both the loop antenna and tuner components.
I use magnetic loops with other transceivers that allow the tuner to be
disabled, but not with a K2. My K2 is used with numerous wire dipoles,
full-sized loops, an LPDA, and verticals, but not with magnetic loops.
Gus Hansen
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