[Elecraft] Phantom signals

[Grant Youngman]

I sometimes notice a host of phantoms that follow the tuning, but only when the preamp is off. Turning on the preamp generally kills them all. 

This doesn’t help with the fixed frequency junk being generated by the myriad of switchers in the house, though. Different issue. 

Grant NQ5T

> On Nov 27, 2018, at 6:16 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
> Another thing to suspect is noise generated by a computer, or ethernet modems and routers and being routed to the K3 and P3 via the K3 to computer connection.  I believe that is why Tom suggested winding the USB cable through a type 31 ferrite core.  BTW, that core should be near the computer end).
> 
> Disconnect and power down the computer to see if that is contributing to the "spurs".
> 
> 73,
> Don W3FPR
> 
>>