Since cable companies now offer internet and telephone service, there is
more incentive than ever to keep ingress down. If ingress is not kept to a
minimum, the headend equipment can't see the return signals from cable
modems & telephones, causing service to be degraded or lost altogether.
73,
Tim - N3XX
----- Original Message -----
From: "Andy" <ingraham.ma.ultranet@rcn.com>
To: <rfi@contesting.com>; <tvi-rfi-emi@mailman.qth.net>
Sent: Thursday, August 21, 2008 3:43 PM
Subject: Re: [RFI] BrightHouse & RFI?
> In the "old" days with analog cable TV channels, the cable companies had
> an
> extra incentive to keep RFI from their cables low: When the cables
> radiate
> anything, there is also ingress into the cables (from broadcast stations,
> from ham radio operators, and from other 2-way radio services), and this
> tends to cause herringbone and other interference problems to their own
> customers. So it was in their best interests to use well shielded cable
> and
> to keep their cable plant in good condition; and in some cases (or so I've
> read), that was enough to keep them on their toes and fix any leakage
> problems before people had a chance to complain about interference from
> the
> cables out.
>
> Now that digital has or is replacing analog NTSC on many cable systems, I
> fear that this particular incentive may be largely gone. The digitally
> encoded signals tolerate more RFI ingress before anything goes wrong for
> the
> cable customer.
>
> Andy
>
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