FYI,
Tracked a VDSL problem a year or two ago which seemed confusing at the time
(was actually 2 DSL sources). Figured it was DSL as it had a strong
increase in strength at 3.750MHz (this is where the DSL uplink starts).
Ended up being a problem at two different nearby houses:
House 1 - one of the 4 wire pairs ( 4 pairs used for increased DSL speeds)
had a broken wire. The other wire was acting like an antenna for the DSL
uplink.
House 2 - DSL in the house was using split pairs, aka, one wire from one
twisted pair and another wire from another pair.
The ATT technician was excellent and found and fixed both issues. Noise
gone after his work and both customers mentioned their Internet had not work
this well in years.
Jeff, W4DD
-----Original Message-----
From: RFI <rfi-bounces+w4dd09=gmail.com@contesting.com> On Behalf Of Don
Kirk
Sent: Sunday, September 10, 2023 9:04 AM
To: RFI <rfi@contesting.com>
Subject: [RFI] 80 meters RFI at N9CJT tracked down to an AT&T line (probably
VDSL)
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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