Check the PX3 NB setting, if the NB level is too high then the spike increases 
as you describe.

73 from David GM4JJJ

> On 23 Jun 2016, at 15:58, Sanger, Joseph <joseph.san...@nyumc.org> wrote:
> 
> I have developed a new problem with my PX3, which has been quietly sitting in 
> a case for the past 6 months.
> 
> Whenever I tune across the display, there is a slowly rising spike at the 
> base frequency (for instance, in USB mode this spike adheres to the left hand 
> edge of the bandpass indicator on PX3 screeen), takes about 2-3 seconds or so 
> to increase in intensity, and then dwarfs any of the signals on the band.  
> This spike tracks across as I tune; it is there whether or not the antenna is 
> connected.  I can tune to stations and hear them fine, but the display is 
> barely usable because of this very tall spike that won't go away.  I reseated 
> my cables connecting the PX3 to KX3, with no change in behavior.  I have no 
> other cables here to swap them out, and am kind of stuck
> 
> I have updated b both KX3 and PX3 to latest firmware, with no change in 
> behavior.
> 
> Any thoughts would be GREATLY appreciated.
> 
> --Joe
> --WB2SSB
> 
> Joseph J. Sanger, M.D.
> Associate Professor of Radiology
> Director, Radiology Informatics
> 
> 462 1st Ave.- OBH C&D 1st fl. Rm 7
> New York, NY. 10016
> 
> Phone: (212) 263-3434
> 
> 
> 
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