I hope so too :-)  I have asked my assistant band captain to bring a
laptop.  I was hoping to use this little Stealth computer.  It is fanless,
encased in a metal shell and is a 12v computer.  I stuffed an SSD in it and
run N1MM+ and FlDigi.  A nice little package for FD, or so I thought :-)

I also see the most severe noise on 20m and when I switched to 40m, the
noise wasn't as bad, but still there.  The computer is only about 2 feet
away from the KX3 and PX3.  I also tried to bypass the PX3 with the
computer cable and go direct to the KX3.  Noise was still there.

When I had the RPi connected with no noise, I decided to turn on the small
stealth computer.  It was not connected to the KX3 nor PX3 via audio or USB
acc1 cables.  However, as the processor was working hard during boot, the
noise reappeared on the PX3.  Not as strong, in fact somewhat weak, but it
was still there.  The only common connections were the grounding straps and
the power supply (powerpole block).

I am going to move the equipment around a bit, especially the power supply
and powerpole block.  They normally aren't that close to the equipment in
the shack.  I moved everything to a small table that I plan to have setup
at my station.  Perhaps something is too close to the KX3 and that is what
is picking up the RFI.

Good luck to you to Joe.  I am sure you will find the offender eventually
too.

regards,
Brian
VE3IBW

On Thu, Jun 23, 2016 at 7:34 PM, Sanger, Joseph <joseph.san...@nyumc.org>
wrote:

> 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.waterwo...@gmail.com]
> *Sent:* Thursday, June 23, 2016 7:31 PM
> *To:* Sanger, Joseph
> *Cc:* elecraft@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.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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