I also have SBC DSL (1.5Mbs down/384kbps up), and I've never found any
RFI due to DSL itself. The downstream signal is fairly weak, of
course, but the upstream will be strong. Most of my spurs come from
CPUs, Ethernet signaling, routers, etc. Along with noisy TVs, lamp
dimmers, and all the other paraphernalia of modern life.
I'd be interested to find measured spectra of DSL at various sync
rates. Does anyone know where to find such? Most of the energy in my
case must be below ~1 MHz, I would think, but high-rate services must
go higher.
It's possible that your neighbor has some other kind of appliance
that's coupling to the phone line.
73 Martin AA6E
On 11/24/05, Jay Bareman <Radio_Q@mchsi.com> wrote:
> I am hearing signals that are pulsing in nature with a rep rate of about 80
> a minute, clearly not on a 1 second interval like a clock might be using.
> There is no particular center frequency although it disrupts the entire 15
> meter band. Watching the bandscope on my receiver shows the pulse in a
> different part of the band every time it occurs which just confirms to me it
> is a broad band signal, or a transient pulse. It appears strongest at about
> 20.5 MHz and clearly with a vertical polarization. The signals peak at
> about S8 to S9 (with no preamps) on a force 12 vertical dipole mounted in my
> attic and horizontal antenna's will greatly reduce the signal.
>
>
>
> I started DF'ing the signal and wound up at a neighbors house about 6 houses
> away, maybe 750 feet. The signal is very strong at his telephone company
> Network Interface Box where he has a white cable plugged into it that goes
> into an air vent on the side of the house.
>
>
>
> I have not approached him yet but wanted to get some ideas from the group if
> others have found anything like this. We have SBC DSL lines in the area and
> I suspect that is what he is using.
>
>
>
> I tried the SBC tech support on the internet and that led nowhere.
>
>
>
> Ideas or experiences or suggestions.
>
>
>
> Thanks
>
>
>
> Jim K5QQ
>
>
>
>
>
>
>
> _______________________________________________
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> http://lists.contesting.com/mailman/listinfo/rfi
>
--
martin.ewing@gmail.com
http://blog.aa6e.net
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