[opendtv] Re: News: VHF: Now Everything You Know Is Wrong
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 28 Jun 2009 18:23:14 -0400
Craig Birkmaier posted:
http://www.tvnewsday.com/articles/2009/06/26/daily.4/
Sorry, but I really object to the notion that any of this was either
unknown or mysterious. Including the bit about how the longer
wavelengths were going to be bad for mobile appliances. How many times
have we questioned here whether or not the VHF frequencies were really
in such high demand for other uses than TV? The most practical use,
other than TV, would be for vehicular applications. And I'm positive
that point was made more than once.
Seems to me that if high VHF was capable of withstanding analog power
levels in the 300 KW range, without undue co-channel interference
problems, something similar, even if at 6-9 dB less power (average vs
peak), will equally work well with digital. Consider this: The actual
usable range of DTV VHF, at the power levels established by the FCC in
places where everyone is complaining, is much less than the FCC
apparently thought. That ALSO means that co-channel inteference
potential is much less than they apparently thought. Right? So I don't
buy this new twist on why the low power.
So let's try a new rule of thumb that is more similar to what UHF
allows. If UHF allowed 5 MW in analog and now allows 1 MW in digital,
that translates to a 7 dB difference. Let's try that out for VHF. Crank
up the power of WBAL-TV, to give an extreme example, from the current 5
MW to 63.1 KW, and see how far that goes to solving the problem.
Bert
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