[Elecraft] Interesting K3 QRM problem

[Jim Brown]

On 10/23/2014 10:36 AM, Vic Rosenthal 4X6GP/K2VCO wrote:
> It isn't necessary to filter the loop. What is happening is that BC RF 
> is coming into the ANT1 connector of the K3 from the vertical, where 
> it is mixing up with every other signal around, probably in the t/r 
> switch section. Then the IMD products (which are on numerous 
> frequencies) are getting re-radiated by the vertical, and they are 
> picked up by the loop. 

Maybe, and if you're right, my suggestion may not help. But you 
misunderstood my suggestion. There is an insert point between the T/R 
switch and the RX input. That's the RX loop I was talking about -- you 
insert the filter there.

73, Jim K9YC