What sort of "small computer", Brian?
Phil W7OX
On 6/23/16 4:31 PM, Brian Waterworth wrote:
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
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