[opendtv] Re: Demand for free DTV rising in Australia
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 20 Jun 2007 11:04:03 -0400
Bob Miller wrote:
> Look what Rhodes says of interference from unlicensed
> radios in that spectrum. I like his "terrifying" the best.
Didn't we already know this (copied immediately below)? It's the problem
of IM3 distortion. Why make it sound like it's a brand new discovery? I
agree that use of white spaces is risky, and IM3 makes it even more
risky. This also holds for COFDM.
"The fact that more than one U signal can result in
interference, even when both U signals are below their
threshold power levels (measured separately), makes the
interference possibilities simply terrifying when
unlicensed transmitters begin to share broadcast spectrum
on Feb. 18, 2009. Stay tuned."
As to professional installation FUD, what is that trying to prove? Is it
any different for professional installation of cable and DBS? Any of
these guys can use Channel 3 as a shortcut, big deal.
As to the chicken-egg problem of scanning DTV channels initially, when
analog channels will no longer be there to help, how is that any
different with COFDM, and especially with low power COFDM? The answer,
obviously, is to use the various aids made available by the CEA (e.g.
antennaweb) or equivalent in other countries.
> It is not just that 8-VSB is a c**p modulation like I
> said. In fact it is the attitude of Congress and the
> FCC and frankly most broadcasters that allowed 8-VSB
> in the first place.
8-VSB is irrelevant in all of this. The problem here is unhelpful FUD
and hype.
Bert
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