[opendtv] Re: First look at ATSC HD Broadcast
- From: Doug McDonald <mcdonald@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 11 Jun 2005 15:56:39 -0500
John Golitsis wrote:
> And just so the full story is re-told, that "receiver" was offered by the
> manufacturer as one that would fit the needs of the testing. We all read
> the official request, and the official reply, and the manufacturer failed to
> make any mention at all of it's need for front end filtering. Nor did
> Sinclair who was in possession of the receiver before it was passed on to
> the NAB.
>
> Of course, AFTER the testing was completed is when this all came up. How
> bloody convenient.
Yes indeed.
But note that if that test had used a pure gridded site selection
process, covering that actual-use coverage area of Washington DC
stations, ATSC would have won, as it always has, whether or not the
COFDM receiver had had a better RF pre-filter.
All apples versus apples tests (i.e. same bitrate in same
bandwidth) of ATSC versus COFDM have always resulted in
ATSC winning ... so long as they were not biased so that
ATSC's strength, better C/N performance, was intentionally
not tested, by using only locations very close to the receiver.
********************************************************************
I have made some recent extensive tests of ATSC at my home and the
results are dramatic: I frequently have ATSC reception on some channels
when the corresponding, colocated, adjacent channel, NTSC will NOT SYNC
on my TV set. Some of the non-sync cases are due to low signal, and
some to multipath. occasionally I get ATSC reception when there
is no corresponding NTSC visible AT ALL. In one case this is very
frequent, though the channels are not adjacent (44 and 55). I recently
obtained a broadband 2.5 dB NF preamp, which is 3 dB better than my
old ones, and the result is frequent reception of a station (off the
back of a very high F/B ratio antenna) that I previously thought
was not receivable due to multipath!
Nevertheless, I'd love to try one of the 5th generation "true miracle"
boxes and see if it gave me more stations off the wrong antenna.
Doug McDonald
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