[opendtv] Re: Martin: 15% of Stations Face Smaller DTV-Coverage Areas
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 18 Sep 2008 15:52:50 -0700
I should have said; "it's not ALWAYS practical.
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Dale Kelly
> Sent: Thursday, September 18, 2008 1:41 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: Martin: 15% of Stations Face Smaller DTV-Coverage
> Areas
>
>
> All of John and Don's remarks are valid, IMO.
>
> However, my point was that the FCC, based upon its original allocation
> planning, knew of coverage disparities from the very beginning.
>
> One example: I attended a meeting at the FCC in the late 90s in which they
> presented the transmission facility planning factors required for
> analog to
> DTV replication. This original plan required 5000 KW UHF ERPs to replicate
> DTV coverage of many VHF analog stations. I was astonished by the staff?s
> lack of understanding regarding the unpractical nature, economically and
> otherwise, of constructing and operating such massive facilities
> and I spent
> a short time at that meeting explaining the issue. Later the max
> UHF DTV ERP
> was scaled back to 1000KW but that action is responsible for a
> number of the
> current replication problems.
>
> The moral of this story is that you can?t have it both ways. While it is
> theoretically possible to replicate VHF analog coverage using
> UHF, it is not
> practical.
>
> > -----Original Message-----
> > From: opendtv-bounce@xxxxxxxxxxxxx
> > [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of John Shutt
> > Sent: Thursday, September 18, 2008 4:24 AM
> > To: opendtv@xxxxxxxxxxxxx
> > Subject: [opendtv] Re: Martin: 15% of Stations Face Smaller DTV-Coverage
> > Areas
> >
> >
> > How much of this is due to co- or adjacent channel interference?
> > How much
> > is due to the predicted UHF equivalent coverage power level not
> > replicating
> > a low VHF station's NTSC pattern? How much is due to receiver front end
> > desensitizing from a nearby high power UHF, preventing reception of a
> > further UHF (a problem my station is already facing)? How much
> > of this is
> > due to the very large disparity in FCC authorized UHF power levels of
> > different stations in the same market? Two VHF stations in our
> market are
> > authorized 1 MW ERP, while the others are authorized in the
> > neighborhood of
> > 50KW ERP.
> >
> > What I never found out was are all of the Wilimgton stations on
> > their final
> > channels at final power, and are the stations in adjacent
> markets also on
> > final frequencies? Three stations in our market are out-of-core,
> > and as a
> > result we're not sure what our final coverage will be when we
> > light up for
> > the first time on channel 40 on 18 Feb.
> >
> > John
> >
> > ----- Original Message -----
> > From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
> >
> > > Martin said that perhaps 15% of the nation's TV
> > > stations might have carriage shrink "in a significant way,"
> > similar to the
> > > changes in WECT's coverage area.
> > > He added that the effect of that changed contour was the key lesson
> > > learned
> > > from Wilmington. He said FCC engineers were working on
> > identifying all of
> > > those markets -- he said it would take a few weeks -- and the
> FCC would
> > > address remedies on a case-by-case basis, calling it the "highest
> > > priority"
> > > for the commission. Subcommittee chairman Ed Markey (D-Mass.)
> > told Martin
> > > the issue needed resolving "very soon," at least by
> > communicating the fact
> > > to viewers who might lose their signals do to coverage-area changes.
> > >
> > > Broadcasting & Cable
> > >
> > >
> >
> >
> >
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>
>
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