Posted by
Darwin, Keith on
Apr 19, 2006; 5:27pm
URL: http://elecraft.85.s1.nabble.com/K2-problem-or-is-it-the-antenna-tp388957.html
My K2 will not give more than a few watts out on 40 meters when driving
my antenna. Into a dummy load it gives full power. On 30 meters with a
different antenna the rig is fine. I wondered if it was a problem with
the rig but I saw some other things that make me think it's an antenna
problem.
The antenna is a ground mounted vertical fed with 30 feet of RG-213 to a
Heath manual tuner in the garage. From there, RG -8x takes the signal
all the way to the shack. I go to the garage with my MFJ analyzer and
adjust the tuner for a match on my operating freq. I did this and got a
1:1 match at 7040. I then went to the shack and confirmed the same SWR
at the rig.
Hook up the rig, key it and the SWR meter shows very high SWR. Rig is
generating hardly any power out. Recheck with the analyzer and SWR is
fine. Hmm. I'm thinking the issue is power related. Could it be that
my antenna system has a problem that only shows up when you hit the
system with a few watts and doesn't show when the analyzer hits it with
milliwatts?
Last night I tried it again and noticed the resonant frequency had
shifted from 7.040 to 9 MHz. I think it is time for an antenna / tuner
/ coax review.
- Keith -
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