[Elecraft] PX3 problem

[Alan]

I think you must be referring to the notch that occurs at the KX3 VFO 
frequency.  The I/Q output of the KX3 is AC-coupled so there is no 
response at zero HZ, which corresponds to the KX3 VFO frequency.  In CW 
mode, this is offset from the receive frequency by the CW pitch, 
typically 600 Hz, either above or below the passband, depending on which 
sideband is selected.

If there is any 60 Hz or other line-related hum getting into the I/Q 
input then you will see n*60 Hz sidebands on either side of the notch.

Alan N1AL


On 06/16/2015 06:01 PM, John K7JLT wrote:
> I have not heard anything from Elecraft about this problem.
>
> John K7JLT
>
> "Dauer, Edward" <edauer at law.du.edu> wrote:
>
>> Just saw your posts in the archives.  I am experiencing the same, except that in my case there are two narrow S2 spikes at either end of the empty gap.  Has anyone at the factory ever commented or explained what could be done?
>>
>> Ted, KN1CBR
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