Scott, I’ll update the status as soon as we locate it.
73/161,
Allen R. Brier N5XZ
1515 Windloch Lane
Richmond, TX 77406 USA
713-705-4801
[email protected]
From: WE5J <[email protected]>
Sent: Sunday, August 30, 2026 6:19 PM
To: [email protected]
Cc: 'Texas DX Society Texas DX Society' <[email protected]>; 'BRAZOS VALLEY
AMATEUR RADIO CLUB' <[email protected]>; [email protected]
Subject: Re: [tdxs-list] Need assistance locating RFI interference
Glad to hear Rodney helped. He found some issues around my QTH a few months ago
and they were promptly fixed, CenterPoint equipment.
Please let us know what the AC fix is, I suffer from the same noise issue.
73 de WE5J
Scott
Sent from Proton Mail <https://proton.me/mail/home> for iOS.
-------- Original Message --------
On Sunday, 08/30/26 at 17:01 [email protected] <mailto:[email protected]>
wrote:
I think I have narrowed down the likely source of the noise I'm hearing to a
newly installed variable speed AC unit. It has peaks 16 KHz apart, typical for
harmonics from a VSD and it is cyclic.. on for a while/off for a while day and
night.
As soon as I get a tinaSA unit (which BTW has a built-in step attenuator) I’ll
start looking for it.
I appreciate all the input.
73/161,
Allen R. Brier N5XZ
1515 Windloch Lane
Richmond, TX 77406 USA
713-705-4801
[email protected] <mailto:[email protected]>
From: William Schrader <[email protected] <mailto:[email protected]> >
Sent: Sunday, August 30, 2026 4:20 PM
To: n5xz <[email protected] <mailto:[email protected]> >
Cc: Texas DX Society Texas DX Society <[email protected]
<mailto:[email protected]> >
Subject: Re: [tdxs-list] Need assistance locating RFI interference
Allen.. you'll need a step attenuator, if you don't already have one... Or,
build one.
I see that you can buy little brick attenuators that are 50 dB...I think those
are not very helpful compared to a step attenuator.
I happen to own a couple of HP ones--- one is 120 dB in 10 dB steps, and the
other is 12 dB in 1-dB steps.
I built one outta the Handbook years ago that is 10 dB steps using a bank of
slide switches.
If you go that route, be sure to build it into an RF tight box.
On Sun, Aug 30, 2026, 11:19 AM n5xz <[email protected]
<mailto:[email protected]> > wrote:
Yeah, tinySA. Looks like a neat device. I might buy one, too.
73 Allen N5XZ
Sent from my Galaxy
-------- Original message --------
From: William Schrader via tdxs-list <[email protected]
<mailto:[email protected]> >
Date: 8/30/26 8:06 AM (GMT-06:00)
To: Allen Brier <[email protected] <mailto:[email protected]> >
Cc: [email protected] <mailto:[email protected]>
Subject: Re: [tdxs-list] Need assistance locating RFI interference
Update: I found on the Amazon site that they sell a "ruggedized" case version
of the little spectrum analyzer-- It's $179, so about the same price. I've
bought one--- Will be interested to see how it performs.
73
Tuna K2TNO
On Sun, Aug 30, 2026 at 12:15 PM William Schrader <[email protected]
<mailto:[email protected]> > wrote:
RE: Bill's link to a spectrum analyzer on AMAZON--- you sent us the link to
your purchase...
I looked on their search box for "spectrum analyzer" and found it:
SeeSii TinySA Ultra+ ZS406 Spectrum Analyzer,
73
Tuna K2TNO
On Sun, Aug 30, 2026 at 8:33 AM Bill Wibker via tdxs-list <[email protected]
<mailto:[email protected]> > wrote:
Hi Allen,
Something like this should be helpful; it's a handheld Spectrum Analyzer.
https://www.amazon.com/gp/your-account/order-details/ref=dp_iou_view_this_order?ie=UTF8
<https://www.amazon.com/gp/your-account/order-details/ref=dp_iou_view_this_order?ie=UTF8&orderID=113-7282975-3405068>
&orderID=113-7282975-3405068
I have one still in the box that I could send you. I'm in Paige near Bastrop.
I'm guessing the amateur radio operators who participate in foxhunts at BVARC
could help.
Here's a video.
https://www.youtube.com/watch?v=UMu5AhSg-TI
<https://www.youtube.com/watch?v=UMu5AhSg-TI&list=PLF1q9GtpjOrZyZ1KpfXjyJyLAWy-WRvba>
&list=PLF1q9GtpjOrZyZ1KpfXjyJyLAWy-WRvba
I could ship it to you on Monday or Tuesday. I'm in San Marcos and the analyzer
is in Paige.
73
Bill WI5P
On Sun, Aug 30, 2026 at 1:44 AM <[email protected] <mailto:[email protected]>
> wrote:
All,
I need some assistance tracking down some serious RFI in the area. This RFI was
originally only seen on 17 and 15m but now has extended all the way from 30
thru 10 meters and coming from two directions. They just started in the last
month or so. I am requesting the help from someone with a battery powered or
mobile radio with a bandscope so that we can locate the sources. I don’t think
these noises can be found with a standard AM radio. Rodney from Centerpoint was
kind enough to help and indicated that the RFI appears to be coming from an
adjacent neighborhood (Brazoswood Estates) but he could not pin down the exact
locations.
I’m attaching screen captures from my K4D. If they get stripped I can send the
in a separate email.
K4SCRNCAP0017/18 are approx.. bearing 320 deg. Spacing is ~ 16 KHz
KRSCRNCAP0019 is approx. bearing 180 deg. Spacing is also ~ 16 KHz
Other times I get spacing between peaks of 45 KHz as in K4SCRNCAP0024 bearing
~310 deg.
I’ve noticed sometimes they do drift in frequency, other times they are fixed.
If I could arrange with someone with a suitable radio then perhaps we could
find the culprits. Not sure what I’ll do if these are emanating from local
residences, I’ll have to cross that bridge when I get there (anyone have a good
contact with the FCC?).
Please contact me off list if you can help or post here if you recognize the
waveforms.
TIA,
73/161,
Allen R. Brier N5XZ
1515 Windloch Lane
<https://www.google.com/maps/search/1515+Windloch+Lane+Richmond,+TX+77406+USA?entry=gmail&source=g>
Richmond, TX 77406 USA
<https://www.google.com/maps/search/1515+Windloch+Lane+Richmond,+TX+77406+USA?entry=gmail&source=g>
713-705-4801
[email protected] <mailto:[email protected]>
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