Hi,
I must agree with Alan here... One of the first steps, ahead of WHAT,
should be WHERE...
This was a great example of RFI sleuthing! Well done!
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 9/10/23 09:09, Alan Higbie wrote:
Don’s approach in this case is a good example of first focusing on WHERE IT
IS.
Imagine how much time they saved by simply locating and sniffing out the
source.
Trying to determine WHAT IT WAS by looking at the SDR, how it sounded and
researching databases would have only added time and delayed elimination of
the RFI.
73, Alan K0AV
On Sun, Sep 10, 2023 at 7:03 AM Don Kirk <wd8dsb@gmail.com> wrote:
I was asked to help locate the source of RFI at N9CJT and yesterday we
tracked down/identified the source to be from an AT&T (formerly Ameritech)
system and all indications are that the system is VDSL or similar.
For those interested here is the link to a video that documents this case.
https://youtu.be/3sYZTXGnLjY
Once again the portable flag with DX Engineering preamp allowed us to
quickly narrow in on the property where the RFI was originating and then we
used a small sniffer loop to identify a specific line (cable) on the wooden
utility pole where the RFI was emanating from, and this line turned out to
be an AT&T line. Noel (N9CJT) will now follow-up with AT&T.
Just FYI, and 73.
Don (wd8dsb)
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