[Elecraft] KX3 AM breakthrough (&KX2)

[Fred Jensen]

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
>