[Elecraft] Kx3, wsjtx, broadband noise

[Tox]

Hm. And as soon as I send that I check, and 15/30m has 15dB of odd surging
over a 1-2Hz cycle. Maybe it really it taking everything out

On Sun, Feb 2, 2020, 9:40 PM Tox <scott.small at gmail.com> wrote:

> 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?
>> >
>>
>