[RFI] 80 meters RFI at N9CJT tracked down to an AT&T line (probably VDSL)

[Dave (NK7Z)]

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 at 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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