[Elecraft] PX3: Possible problem with display

[Larry Naumann]

I am pretty sure they are internally generated, plus they move with the cursor. They are mirrored above and below the cursor. I ran everything on batteries and took it for a walk outside. No change in signals. The S1-2 spikes aren't bad as band noise will mostly cover them, it is the S4 spikes that are concerning. No amount of OSN makes any difference as far as I can tell. No change while fiddling, moving or twisting cables either.
Larry
n0sa

Sent from my iPad

> On Sep 9, 2016, at 11:24 AM, tomb18 <tomb18 at videotron.ca> wrote:
> 
> Hi
> Since you are finding that the peaks diminish when the cables are removed it would seem that the cables are picking up signals from your environment. 
> What happens if everything in your house is turned off except for the px3?
> I know my p3 will show fixed peaks that don't change with tuning if  I have certain other equipment on that is close to the px3.
> If you find a culprit try putting ferrite on the cables.
> 73
> 
> 
> 
> Sent from my Samsung Galaxy smartphone.
> 
> -------- Original message --------
> From: Larry Naumann <n0sa at att.net>
> Date: 2016-09-09 11:31 AM (GMT-05:00)
> To: donwilh at embarqmail.com, elecraft at mailman.qth.net
> Subject: Re: [Elecraft] PX3: Possible problem with display
> 
> Don
>   Thanks for the suggestion but that does not fix/improve the situation. 
> Looking at it further I also have spikes at roughly 23, 30 and 52Khz 
> above and below my cursor. The 52 Khz signal is at S4 the other two are 
> about S2. I can turn on the PX3 and look at the display with no antenna 
> connected and see these spikes on every band. If I disconnect the cables 
> to the KX3 the signals are still there but go down to S1 in strength. I 
> have even tried running both on separate battery supplies but the 
> problem is the same. The spikes are there even if I disconnect the I/Q 
> cable but the spikes are very small, as soon as the I/Q cable is plugged 
> in the spikes increase.
> Larry
> n0sa
> On 9/9/2016 9:22 AM, Don Wilhelm wrote:
> > Larry,
> >
> > I suspect hum, buzz, and noise pickup on the RX I/Q cable shield 
> > between the KX3 and the PX3.
> > Try "Bonding" - run a heavy wire or strap between the KX3 and the PX3 
> > in parallel with the RX I/Q cable.  The shield from old RG-8 coax 
> > works well.
> >
> > 73,
> > Don W3FPR
> >
> > On 9/9/2016 10:12 AM, Larry Naumann wrote:
> >> I have just recently noticed that there is a continual spike that 
> >> follows my cursor. It is internally generated. In CW mode it is away 
> >> from my tuned signal by the amount of my CW side tone setting and can 
> >> be switched to above or below the cursor depending on if I am in CW 
> >> or CW-R.
> >> These spikes occur with no antenna connected and are S4 to S5 in 
> >> strength depending on band.
> >> I did the Opposite Sideband Rejection adjustment but show no 
> >> improvement.
> >>   I think something is either set wrong or I have an issue.
> >> Any help or ideas are appreciated.
> >>
> >
> >
> 
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