[opendtv] Re: Compare and contrast to MSTV's 1999 position/testing
- From: Nat Ostroff <nostroff@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 20 May 2008 17:27:38 -0400 (EDT)
For all of you who do not remember those times and events here is some
refresher information.
The COFDM receiver, whose technical details and manufacturer were hidden from
the engineering committee, that was used to "fly off" the 8VSB/COFDM test had a
wide open 2ghz front end with a wide band preamp and no filter. The 8VSB
receiver was equipped a normal channelized tuner. After the "strange" test
results were made available to the MSTV Engineering Committee, at the end of
the field operations, the details of the receiver's design were made known to
the Committee. . We at SBG were able to go out with the very same COFDM
receiver but with a preselect front end filter and demonstrated that the entire
test result were flawed. Where the COFDM reception had failed and 8VSB had
worked we found that the filtered front end COFDM receiver was able to receive
the signal. In fact where 8VSB and COFDM had both failed in the initial
testing, the filtered COFDM receiver was able to receive the transmissions.
It became quite clear that the data for the COFDM tests were corrupted by a
receiver that was suffering from front end overload by strong, off channel,
signals. In fact, the manufacturer of the COFDM receiver sent a letter stating
that their equipment was for laboratory use and not suitable for field testing
using an antenna. This information was presented to the joint NAB/MSTV Boards
in Carlsbad Ca. The joint Boards chose to ignore the results and moved to
approve support of 8VSB as the US standard.
So here we are today with the consequences of that decision. The full impact of
which may not be felt till Feb 09.
Nat Ostroff
----- Original Message -----
From: "John Shutt" <shuttj@xxxxxxxxx>
To: opendtv@xxxxxxxxxxxxx
Sent: Tuesday, May 20, 2008 3:46:38 PM (GMT-0500) Auto-Detected
Subject: [opendtv] Re: Compare and contrast to MSTV's 1999 position/testing
That's because in 1999 MSTV was promised that NxtWave had "cracked the code
for mobile and indoor reception."
http://www.hdtvmagazine.com/archives/Nxtwave.html
And in 2000, MSTV was told to ignore the flaws in the chosen COFDM receiver
for the Washington/Baltimore/Cleveland MSTV-NAB tests.
(Yes, Bert, I know.)
John
----- Original Message -----
From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, May 20, 2008 2:51 PM
Subject: [opendtv] Compare and contrast to MSTV's 1999 position/testing
> Seems to me that MSTV's perspective now is at odds with their defense of
> 8-VSB
> in late 1999.
>
> http://www.washingtonpost.com/wp-dyn/content/article/2008/05/19/AR2008051902730.html?sid=ST2008051902978
>
> John Willkie
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