Pat,
The KXAT1 is optimized for the lengths shown in the manual, so I am
surprised that you are having trouble with them. OTOH, such
non-resonant antennas are sensitive as to how they are deployed.
If you continue to have trouble on 40 meters, I would suggest a 33 ft.
radiator with a 33 ft. radial. That should be close to resonance on 40
meters and provide a sufficiently low feedpoint impedance to the KXAT1.
73,
Don W3FPR
On 4/19/2015 6:08 PM, Pat Ring wrote:
Hello. I researched this, eh, pretty thoroughly, but I keep running into a
little problem with the recommended lengths for direct-fed antennas. The
KXATU guides recommend a 24'-28' radiator and a 1/8 wave
ground/counterpoise, but I have seen 28' and 41' recommended as well (some
with recommended radials and some without). The 24' wire tuned up fine on
20m and 30m, around 1.2:1, but I can't get an KX1ATU lower than about 8.9
SWR on 40. Am I missing something obvious, or should I continue to
experiment? I've only tried that ATU about three times on 40M because that
SWR seems pretty high to me and has to be tough on the kit. I am reluctant
to continue to try anything in this range now. I don't really want to take
coax on the road with me, and 20m and 30m are ok, but I would like to
participate in the 4sQRP on 40m when I am on the road this week. I would
appreciate your advice. Thanks. Pat NQ0N
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