And complaining to AT&T about something that might be their problem and that
their techs have no idea how to find or fix won't help. If you think it is
your modem just unplug it from both the power and dsl line and see if it
gets quieter. If there are neighbors close enough that it could be from
them you may have to convince them to help you. if its not yours maybe
df'ing with a small loop and portable hf radio will help find it.
More about frequency bands for various versions of dsl:
https://en.wikipedia.org/wiki/VDSL
And uverse: http://adslm.dohrenburg.net/uverse/
It looks more like uverse if it starts near 3775 as shown in the second
link.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Rob Atkinson
Sent: Sunday, July 16, 2017 12:09
To: rfi
Subject: [RFI] white noise starting at 3780 and up
Howdy,
I've been tolerating something here that is a nuisance for the past few
years: Tuning up through 75 meters, at around 3780 or 3790, the band noise
suddenly goes up 20 dB and stays there all the way up to over 5 MHz. It's
just white noise, like data. Does anyone else have
this? I suspect it is AT&T VDSL but I want to find out if there are
other possible causes. It's puzzling that only that one frequency
range has the noise since Uverse or VDSL whatever it is, uses a number of
other "bands" for data uplink and downlink. I have done nothing partly,
because the whole scenario of calling AT&T and getting to a human who knows
what I'm talking about will probably take hours and be a frustrating
nightmare but every time I tune down the band and have the noise floor
suddenly drop I get ticked off.
I guess I'm hoping someone else has had this problem and dealt with it
and can give me some pointers. If it is indeed an AT&T problem maybe
there's a secret phone number to get me right to a technician.
tnx and 73
Rob
K5UJ
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