I have a Hy-Gain TH7-DX antenna that has a high SWR on 15M ONLY. With only
about 30 watts power, the SWR is 1.5 to 1 but as soon as about 300 to 400 watts
are applied, the SWR jumps to over 4 to 1.
It works perfectly on 10M & 20M. I removed all the 15M traps looking for
carbon tracking, dis-assembled them and wire brushed the coils and cleaned them
with solvent.
After installing all the cleaned 15M traps I still have the same problem. At
that point I removed both the 10M and 15M traps and wire brushed all the traps
and re-installed them again with the same high SWR problem only on 15M. This
time I kept my antenna tuner out of the system by installing a barrel connector
between the in and out coax cables.
While testing the SWR again on 15M, I just happened to touch the coax
connector's (yes they were tight) at the barrel connector and they were VERY
HOT.
At this point I replaced the BN-4000B balun with a new one and I still have the
exact same problem.....a 4 to 1 SWR jump from 1.5 to 1 when applying over 300
watts or so on 15M ONLY.
Anyone have any idea what the problem might be ?
Gary
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