[Elecraft] Kx3, wsjtx, broadband noise

[Tox]

In any case, doesn't sound like there's any particular Elecraft filtering
wizardry I can engage.

Given that they've repeatedly slipped K4 dates, now wondering if I should
cancel my K4D.

Thanks for the feedback, everyone.

Scott
AD6YT

On Sun, Feb 2, 2020, 9:50 PM Tox <scott.small at gmail.com> wrote:

> Yeah, all bands.  Then suddenly clears, signals sprout all over the
> waterfall and are promptly silenced once more.
>
> On Sun, Feb 2, 2020, 9:44 PM Tox <scott.small at gmail.com> wrote:
>
>> 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?
>>>> >
>>>>
>>>