DVB-T Dongle

[wb4jfi at knology.net]

And I can't count!!  I thought that I had edited the "two main problems" to 
"a few significant problems".  Oh well....
Terry, WB4JFI


-----Original Message----- 
From: wb4jfi at knology.net
Sent: Thursday, May 16, 2013 4:19 PM
To: William Fenn ; Mike O'Dell
Cc: tacos at amrad.org
Subject: Re: DVB-T Dongle

As I remember, COFDM was better, but there were two main problems.
1.  8VSB had already been chosen, and there would be a significant
disruption in timelines (pushed by Congress and the FCC) to return wanted
spectrum to "the public".

2.  COFDM requires even more headroom (peak-to-average power) in the
transmitters.  I think it was 6-10dB additional headroom, which is not
insignificant.  MUCH more expensive transmitters.

3.  At the time, COFDM was in an "experimental" phase, while 8VSB was proven
technology.

4.  Sinclair's move was profit-driven.  They had purchased a company that
had exclusive rights to part of the COFDM chain, and stood to make huge
licensing profits if COFDM was chosen.  I can't remember if it was the
encoder, modulator, or other part of the transmitter system.  But, don't kid
yourself, Sinclair was purely profit-driven.  They bought into that company
first, then tried to turn the DTV transition on its head to make money.

I am not saying that I agree with all the above reasoning, but those were
the salient points.  I was peripherally involved in some of the testing,
through our MSTV membership at the time.

At least that's what I remember.
Terry, WB4JFI


-----Original Message----- 
From: Mike O'Dell
Sent: Thursday, May 16, 2013 3:05 PM
To: William Fenn
Cc: tacos at amrad.org
Subject: Re: FW: DVB-T Dongle

if I remember that test correctly, COFDM kicked VSB8's ass
from DC to Baltimore and back. Much less vulnerability
to multipath and more square miles per transmitted watt
in terms of coverage.

   -mo
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