[opendtv] Re: Charles Rhodes on SFNs
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 27 Jun 2010 20:07:30 -0400
Craig Birkmaier wrote:
> Richmond to Philadelphia = 202 miles
> Washinton to New York City = 211 miles
> But none of this is relevant to the current
> discussion.
And Baltimore to NYC?
This is certainly relevant. Because when push comes to shove, what the FCC does
is to assign the SAME channels to every other market, in congested cases. There
are no major markets between Richmond and DC, Craig, so no matter what, you
wouldn't expect them to use the same VHF channels. And there are no major
markets between Wash/Balt and Phila either. US TV markets are big, and they
neeed to be covered efficiently.
>> Channel 7 is used in DC, and a low power Channel 7
>> transmitter also in Phildelphia.
>
> Irrelevant.
Oh, that's truly priceless. The "advantage" of a Ch 7 SFN in the DC market
would be to allow reuse of Ch 7 in at least parts of Phila, right? Well, that's
already done. Just like Ch 13 from Balt and a low power in Phila. Do you really
not get it?
> The distances between antenna sites for SFNs that
> use the same channel for different content can be
> significantly closer than 100 miles based on power
> levels and emission masks.
Huh? An SFN with different content from each tower, guess what, is not an SFN
anymore. If you have SFN towers that are designed to provide even covergage of
a market, and you repurpose those same towers to provide different content,
you'll end up with a wasteful mess, Craig. You'll end up with interference
zones EVERYWHERE, except perhaps in very close vicinity to each tower. In other
words, you will waste coverage area egregiously. And emissions masks don't
change this fact. All emissions masks do is move the interference zones closer
or further from a given tower.
Bert
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