[RFI] 160 meter noise at W9RE tracked down to neighbors Comcast Cable Box / Power Supply

[Don Kirk]

Hi Jim,

I use google earth on almost every case to get distance and bearing and it
sure is a great tool.  Mikes property and his closest antenna in his EFBS
receive array is about 50 feet from the neighbors property line and about
200 feet from the neighbors house.  What was interesting about this case is
that the noise level was so high on his 160 meter EFBS receive array and
not high at all on his YCCC receive array.  Turns out that one of his
antennas in the EFBS array is very close to the guilty neighbor whereas
none of his antennas in the YCCC array were as close.  Makes sense now but
originally we were confused, and that was because the noise source was in
so close to his property in regards to one of his antennas in his EFBS
array.  The only thing that helped us figure out what was going on was to
do DFing right on his property with my new terminated loop antenna, and
that quickly led us to the neighbors house.

Good luck, and sounds like it's just about time for you to knock on the
door of your suspect residence to get their assistance in confirming their
property is indeed the source and then figure out what device is the root
cause of the problem.

Don (wd8dsb)




On Sun, Feb 23, 2020 at 8:16 AM AA5CT <jwin95 at yahoo.com> wrote:

>
> Don,
>
> What is the distance between station antenna and the offending noise maker?
> Google maps has a quick, handy distance measuring tool once in the map,
> using the satellite view even.
>
> I have a noise source on 160 that I tracked to a residence, and the
> utilities
> are buried leading me to think it is something other than a power line arc.
>
> I do recall seeing a cable TV coax lying on the surface to one side of the
> alley paving while making one bicycle run down the alley, in the vicinity
> of the residence, so I wonder now if those two are somehow related in
> this case too? On another 'run' I will RF sniff the cable itself.
>
> The distance in my case is 3,920 ft or 1.2 km from my QTH to the
> residence with the noise maker at ~20 degrees compass bearing.
>
> 73, de AA5CT Jim
>
> .
> .
>
>
> On Sunday, February 23, 2020, 2:22:39 AM GMT-6, Don Kirk <wd8dsb at gmail.com>
> wrote:
>
>
>
>
>
> I just uploaded a video on your tube that shows RFI that Mike (W9RE) has on
> 160 meters that we tracked down to a neighbors Comcast cable box and
> associated power supply.
>
> Here is a link to the video for those interested.
> https://youtu.be/qXGf4l9j2wk
>
>
> P.S. Mike had never met these neighbors and they were amazing people to
> work with.  They let Mike and I come into their home, turn off circuit
> breakers, and walk around their home until we found the offending device.
> They are now going to work with Comcast and Mike to find a solution as a
> power line choke made with a number 31 material Toroid core did not reduce
> the RFI.
>
> Just FYI and 73,
> Don (wd8dsb)
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