[RFI] white noise starting at 3780 and up

[Larry Benko]

Rob,

Take a look at 
http://www.w0qe.com/RF_Interference/spectrum_display_rfi_tracking.html

I built a setup that works great for tracking via spectrum display.  
Tom, W0IVJ and I did exactly this with Century Link.  I can drive around 
nearly every neighborhood and find this signature of the VDSL2 uplink 
channel between about 3800-5100kHz.  With "good" installations the 
amplitude is lower and with "bad" installations the amplitude can be 
heard for quite a distance. There is a limit to the minimum amplitude 
that can be obtained which is not low enough in my opinion.

Larry, W0QE


On 7/16/2017 6:09 AM, Rob Atkinson wrote:
> 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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