[Elecraft] 12 meter K3 RFI from nearby FM station

[Jim Brown]

Yes, this hit me between the eyes as well. The K3 has Pin One Problems 
at many (most?) connectors, so RF current flowing on shields of cables 
plugged into those connectors will couple into the K3. I've been 
preaching to Wayne about Pin One Problems since 2004, when we met in 
Dayton.

If the problem is around 90 MHz, I'd use multiple one-turn and two turn 
chokes with #43 material on every cable except the SO239 output, which 
IS actually bonded to the chassis. Also choke the power cable.

73, Jim K9YC

On Wed,2/10/2016 2:53 PM, Fred Jensen wrote:
> I easily could have misread the original emailed problem, but he 
> included the note that this RFI occurred with all antennas [and I 
> guess other cables] disconnected which is very strange indeed.  If 
> that is so, then I doubt stubs/filters on the antenna circuits would 
> cure the problem.