[opendtv] Re: Community Broadcaster's Association wants converter boxes to handle analog, too!

From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Date: Sun, 18 Nov 2007 17:45:11 -0500

Bob Miller wrote:

> We were talking DVB-T COFDM. Have no interest in having
> the highest power, want the best reception and SFN/repeater
> capability for mobile reception at high bit rates. DTMB
> would be the best today I believe and close to what DVB-T2
> will be.

I thought you were talking about LPTV. I would think any LPTV station
would want to be able to transmit the highest power they can, to reach
their audience as easily as possible. The situation is no different from
what Sinclair had offered to do back in 1999, which is to lower the
COFDM ERP in order to stay within the existing FCC planning factors.
Only now, you'd be reducing an already reduced power level.

The bit about SFNs doesn't mandate any one solution anymore.

> As you know I am not an engineer ...

Yes, you've said this before, and it's commendable to say so instead of
behaving like a pretender wannabe. But then, why this continuously
inflexible attitude?

> Would have no interest in anything 8-VSB/A-VSB. Reception
> problems, high power usage for receivers, mobile A-VSB is a
> data hog,

You've seen what 8-VSB done right can do, in Mark Schubin's apartment,
with a demod that is now quite long in the tooth (coming up on 5 years
old). Power usage of 8-VSB receivers is no different from power usage of
any other receiver which uses fancy equalizers, such as the Chinese
system or possibly, we don't know yet, DVB-T2. And it keeps coming down
as integration goes up. A-VSB can be used for SFNs without also being
used to increase robustness, therefore without reducing spectral
efficiency.

And finally, we have been through the supposed "data hog" nature of
A-VSB. You can't back that statement up with facts. If A-VSB comes
within some 1.9 dB of the Shannon limit, as it does in its most robust
mode with a diversity antenna in the receiver, then by definition it
can't be considered a "data hog." The only way anyone can call it a
"data hog" is if he doesn't do the numbers and compare apples with
apples. In any event, an LPTV station probably wouldn't want to use the
A-VSB lower data rate robust modes.

Bert

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[opendtv] Re: Community Broadcaster's Association wants converter boxes to handle analog, too!

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