[Elecraft] 12 meter K3 RFI from nearby FM station

[Alan]

On 02/10/2016 03:57 PM, Jim Brown wrote:
> 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.

But it sounds like he was still getting the problem with no cables 
connected to the K3:

On 02/10/2016 06:58 AM, Jon Zaimes wrote:
...
 > Even when ALL cables are removed (only the power lead connected).
 > Grounding or ungrounding made no change. I tried the radios on a
 > battery but still had the RFI. Tried some ferrites on the power
 > lead but no change.

I suppose it could be a "pin 1" problem on the power leads.  It's kind 
of hard to avoid that with an Anderson PowerPole connector.  Probably 
additional low-pass filtering on the DC input would help.

Alan N1AL