Sounds like an application for a high pass filter. That strong a signal, 
and that it is not being detected by other receivers, certainly sounds 
as if it is being generated in the K3 due to overload.

There are 100 watt transmit power level AM broadcast band high pass 
filters available that can easily be installed.

Jack


On 7/23/2010 1:37 PM, Jay wrote:
> The local AM station on 940 is wiping out my K3 on 1880 and 3760 to the
> tune of 20-30db over.  Have the same problem with just the sub
> receiver.  Plugged in my K2 and FT-900 and don't have the problem.  Any
> ideas other the bench the K3 :-)
>
>
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