Mike,
The RFI is cyclic and fairly strong. We will triangulate on it with a tinySA
spectrum analyzer and directional beam then locate it. Most likely I expect we
will have to contact the owner (if it is indeed an HVAC unit) and impress upon
him the importance of having it fixed. We’ll see what happens next. Luckily,
there are plenty of other strong signals on the band so no problems with
working stations.
73/161,
Allen R. Brier N5XZ
1515 Windloch Lane
Richmond, TX 77406 USA
713-705-4801
[email protected]
From: BVARC <[email protected]> On Behalf Of Mike Knerr via BVARC
Sent: Monday, August 31, 2026 9:15 AM
To: BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected]>
Cc: Mike Knerr <[email protected]>
Subject: Re: [BVARC] Need assistance locating RFI interference
If what is it, how is the problem solved?
On Sun, Aug 30, 2026, 6:28 PM Chris Medlin via BVARC <[email protected]
<mailto:[email protected]> > wrote:
I havent seen any replies yet.
First thing i would do is kill all your breakers and run your rig on battery
power. Flip on one breaker at a time to see if its something inside your house
causing the issue. Ive heard things recently like counter top ice maker, smart
frig, etc. so flip your breakers on one at a time. Rule out something that is
under your control.
Next maybe its the neighbor’s hvac compressor.. move the radio to the other
side of the house, test again.
Its going to be a slow process. But it MIGHT BE something within your control.
Good Luck, and let us know what you find. 73/chris/AC5CM
Typos brought to you by iPhone
On Aug 30, 2026, at 01:44, Allen Brier via BVARC <[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+%0D%0A+Richmond,+TX+77406+USA?entry=gmail&source=g>
Richmond, TX 77406 USA
<https://www.google.com/maps/search/1515+Windloch+Lane+%0D%0A+Richmond,+TX+77406+USA?entry=gmail&source=g>
713-705-4801
[email protected] <mailto:[email protected]>
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<K4SCRNCAP0019.png>
<K4SCRNCAP0017.png>
<K4SCRNCAP0018.png>
<K4SCRNCAP0024.png>
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