[Elecraft] PX3 Spike won't go away

[Sanger, Joseph]

Interesting.  I see the noise spike even with the PX3 disconnected from the KX3, and neither is connected to a PC.  There IS  a notebook running about 15 feet away … never occurred to me that this COULD be the source of the noise.  I will shut notebook down in a bit and see if the problem changes at all.

BTW, the noise spike only is occurring on 20 meters, it turns out.  Strange.

Thanks for chiming in, Brian.  Hope you sort out your troubles!

-- Joe
--WB2SSB

From: Brian Waterworth [mailto:brian.waterworth at gmail.com]
Sent: Thursday, June 23, 2016 7:31 PM
To: Sanger, Joseph
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] PX3 Spike won't go away

In prep for field day, I decided to stage everything last night and also ran into the same problem as you describe.  I re-seated all the cables.  No effect.  I turned on the rx shft on the kx3 and the nasty noise shifted away.  Ok, that's good.  But not what I wanted.
I disconnected the USB acc1 cable from the small computer I was planning to take with me to FD and the noise vanished.  Each of the computer, the kx3, px3, external power supply, external antenna tuner are all grounded to a common point.  The exception is the monitor and fan (it's going to be hot :-).
I connected the same setup using a raspberry pi instead of the small computer and no noise observed at the tuned frequency.  Drat.
So, I am thinking of buying a powered USB hub to try and isolate the USB acc1 cable plugged into the PX3.  Seems as thought the small computer I was going to use is picking up the internal IF and bringing it back into the PX3, KX3 via the USB acc1 cable.
regards,
Brian
VE3IBW

On Thu, Jun 23, 2016 at 10:58 AM, Sanger, Joseph <Joseph.Sanger at nyumc.org<mailto:Joseph.Sanger at 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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