An open 1/4 wave stub at the BC station frequency might knock it down
enough to eliminate the problem. That's only 71.3 m [234 ft] of coax if
the station is at 1 MHz. [:-) More realistically, a series resonant L-C
pair across the antenna connector might do the job with less weight. We
used these in the "Olden Days" when the BC stn signal was driving the RF
amp non-linear. Of course, we didn't also transmit out of that
connector then either.
73,
Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn
On 8/11/2017 12:26 PM, Vic Rosenthal wrote:
I live in line of sight of a 50 kW AM BC station and I had interesting problems
with my K3 when I was using a vertical antenna. I made a 3 MHz highpass filter
which fixed it. Note also that the common T network style antenna tuner also is
a highpass filter, so that could be a simple solution. Switching to a
horizontally polarized antenna will also help if practical.
Vic 4X6GP
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