[Elecraft] Kx3, wsjtx, broadband noise

[Tox]

It is much like what I recall when the hydroponics shop was still in
business a couple blocks away. But in that case the source was never on
less than 15 min at a shot.

Part of what is maddening about current is that duration is completely
random, seeing blips during ft8 turnarounds, followed by blocks of 30 min
solid hash, 5 min free, completely unpredictable. I can get ft8 cycles to
complete *just enough* to not rage quit and shut the radio off.

And 15/30 seem less affected than 20/40, which is Confusing. Since the
whole band goes I wouldn't expect it to follow that sort of harmonic
behavior.



What would a 20m spark gap transmitter look like on modern gear?

On Sun, Feb 2, 2020, 9:29 PM Don Wilhelm <donwilh at embarqmail.com> wrote:

> Scott,
>
> It would appear as though you are receiving noise from somewhere.  Your
> steps have eliminated your house, but your neighbors may be the source.
>
> I don't have an easy answer, but I don't think it is in your KX3.  To
> test, does it occur if you connect a dummy load?  If not, it is coming
> in on your antenna.
>
> Filters and NR and NB are not likely to tackle it adequately.  You will
> have to locate the source and send a notice to the FCC for action.  You
> can use the KX3 portable with a short antenna to try to localize the
> source.
>
> Sounds like the interference from "grow lights" that have been reported
> in the past.  Are any of your neighbors starting gardening plants or
> growing pot under UV Grow Lights?
>
> 73,
> Don W3FPR
>
> On 2/2/2020 5:13 PM, Tox wrote:
> > Hoping someone has a suggestion for how I can work around some local QRM.
> >
> > I have a kx3 with filters installed
> > I have wsjtx running.
> > I've recently added a px3 to see if it would help provide insight.
> >
> > I find intermittent broadband noise that desenses my receiver on multiple
> > bands. 1) It appears to either be On or Off, no visible fading.
> > (Transitions are <<1 second). Sometimes a little flickering but usually
> > extends for minutes to hours.
> > 2) When on, signals in waterfall completely disappear or are reduced to
> > just a couple nearby (loud) stations
> > 3) when on, it wipes out at least one whole band (usually 20m, sometimes
> > 40m as well).
> > 4) when on, the full 200khz slice in px3 goes green snow
> > 5) still happens if I throw breaker in my subpanel and am running off of
> > batteries
> > 6) with 30 min of fiddling, haven't been able to see it in a kiwisdr node
> > less than a mile away
> > 7) pskreporter still shows me to be getting out (to the extent I can)
> >
> > Broadband, no visible peaks, so not sure I could triangulate it by
> > wardriving with a Kerberos.
> >
> > Any suggestions?
> >
>