[opendtv] Re: Reality about frequency reuse
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 21 Jan 2017 19:47:04 +0000
Craig Birkmaier wrote:
I disagree with the contention that the suburbs need access to
multiple markets. Every market in the U.S. is well defined.
First, these distant suburbs require interference-free coverage. This is still
THE main point. The need for some amount of overlap between two adjacent
markets is only SECONDARY. The main point remains that you don't have the
luxury of 10s of miles of buffer zone between markets, where co-channel
interference between full power stations, is no big deal.
Second, disagree or not, it's still fact. I repeat: this is only a SECONDARY
point. As long as TV markets require "localism," you will have communities such
as Laurel MD, or Columbia MD, or even Mount Airie, from which people commute
daily, and/or **identify themselves with**, either of two major markets. In
this case, Wash DC or Baltimore. The same happens between
Philadelphia/Wilmington DE and Baltimore markets, between Wash DC and Richmond
markets, and on and on. It's the rule, not the exception, in many parts.
(I have no stake in this "localism" idea, but it's pretty clear that
broadcasters and the FCC do, and that Craig himself has used this "localism"
idea when it suited him.)
So, bottom line, you must avoid co-channel interference. As long as the very
best you can afford, with SFNs, is less than a handful of medium/high power
sticks, you will not get the sharp cutoff contours you would need, to
realistically use the same frequency channel to cover the *entirety of both
adjacent markets*.
As of today, with big sticks, we already have, at very best, "10s of miles" of
allowable buffer zone, between broadcasters on a given channel. This occurs
usually in cases where Ch X is used by a full power station in market A, and Ch
X is also used for a low power station in market B. This allows the suburbs of
both markets to be covered by their respective full power stations, while the
low power station on that Ch X stays away from the suburbs of market A. I gave
you numerous ACTUAL examples.
This is the reality. Vague ideas/propaganda that SFNs will change anything, in
practice, is just propaganda. In order for SFNs to change the reality of what
we have would require too many towers to be affordable, and to be easily sited.
I have frequently used European examples as proof, and I've even quoted the
criteria that were used, when these criteria had been published. Examples are
Berlin (two towers), Rome (two towers), and Paris (one big stick plus 3 medium
sticks).
So, let's not fall back on the vague generalities spouted by SFN advocates,
before the practical realities came to light.
Bert
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