As promised, a follow up. There has been no improvement in my situation. One
major problem is the way the electric coop operates; the RFI guy finds a
suspect, contacts someone else who is supposed to dispatch a crew to address
the issue. If the repair people show up, they do something that may or may not
correct the problem and then go away. I wait a few days and then follow up to
find nothing is resolved. Rinse and repeat.
One thing that has happened is that I contacted our water coop that owns the
pumps that are supplied by the electric coop. After several fits and starts I
was able to get the RFI on site while a water guy turned off the variable
frequency motorized pumps. The RFI was unchanged. This is unfortunate, I was
hoping it was a pump because I think the water guys would be more cooperative
than the electric guys.
So as it stands the RFI guy came to my shack again and hooked his Radar
Engineers RX to my antenna. I took a short iPhone video of what is heard and
displayed.
https://www.dropbox.com/scl/fi/rvjv8nf1eoj8w75stltx6/Radar_Engineers_Video.mp4?rlkey=n5y7ddr8odb7mw4cl68ckmx81&dl=0
Note that the strength indicator is showing -47 dBm. S9 is standardized to -73
dBm. So this is 26 dB over nine, which is about what I measure.
Wes N7WS
On Thursday, March 7, 2024 at 12:51:51 PM MST, Wes Stewart <n7ws@yahoo.com>
wrote:
Hi Chris,
Thanks for checking this. I can confirm, much to my chagrin, that your numbers
are correct.
Everybody
Armed with this I just got back from walking the line from the corner pole to
the west and then south to the pumping station. I should note that with more
attention I saw that the line to the west is three phase all the way, but does
seem to carry a neutral. One phase is feeding "my" line that runs to the north
and another phase feeds the line running to the south.
With my Sony receiver tuned to 1705 kHz and the loopstick active, there was
plenty of sensitivity, but little directivity, to hear the raucous noise under
the pole feeding the pumping station. Subject to changing my mind, I'm now 99%
sure the source is there. Whether it's the power co-op or the water co-op at
fault remains to be seen.
More to follow.
On Thursday, March 7, 2024 at 08:19:16 AM MST, Chris L. Parker
<parker601@earthlink.net> wrote:
Hi Wes,
To answer your question, experience (been there, done that) and experimenting.
I pulled out the old Wavetek 3001 signal generator to confirm the antenna
transition frequency yesterday.
Don's (WD8DSB) very effective flag antenna is now a kit on DXEngineering.
Specified usable for DF down to 1.8 MHz.
The flag will need a preamp for use with the Sony 7600GR (and blocking cap).
They sell a preamp as well.
I built a much more "stealthy" 6-inch ARDF loop for my MW DF work. (QST, Sep
2005, Dale Hunt, WB6BYU)
I have an unidentified 160 meter RFI source in a strip mall 1/4 mile away from
me.
Noise conducts (not radiates) through the powerlines towards my residence. Very
tricky to locate due long wavelength.
I suspect my RFI is HVAC, commercial refrigeration, or similar variable speed
drive electric motor.
Hope this helps.
Chris
AF6PX
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