[opendtv] Re: 20040722 Thundering Thursday Thanks (Mark's Monday Memo)
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 22 Jul 2004 14:25:58 -0400
Wow. This is excellent news indeed. Thanks for the special bulletin.
If I remember correctly, the LG/Zenith 5th gen receiver is supposed
to have a static echo tolerance of +/- 50 usec. And it's supposed to
be incorporated in ATSC products before this coming Christmas
season? We never did get to see elaborate test measurements from
this one.
I'd like to point this out once again: Had we had the "out" of being
able to lower the bit rate to achieve these results, it is unlikely
that you would have seen 3.3 b/s/Hz in this indoor environment.
Because the mother of invention is necessity. In the long run, I
don't think this single carrier approach will have been a bad way to
go. The next step will be to see how the newest receivers will react
to the mobile environment.
Bert
Mark Schubin wrote:
> SPECIAL! DTT in the U.S. Works!
>
> Count me among the believers in the 5th-generation LG/Zenith
> ATSC receiver!
>
> We just did a test, this morning, in my apartment, and I thought the
> news was too important not to release immediately. Present were two
> senior research engineers from LG Electronics in Korea, Bob
> Miller and
> an associate from Viacel, and Richard Bogner and an
> associate. Miller
> had arranged for the test in my apartment. The receiver was the LG
> LST-3100A.
>
> With a simple loop antenna, with NO care in the positioning, we were
> able to pull in seven DTT stations reliably. When I say
> "reliably," I
> mean not only that the pictures and sound were okay but that people
> could move around the room and I could move the antenna
> around without
> causing any breakup. It WAS possible for me to find an orientation
> where I could make it fail, but I really had to try, even on WNYW-DT,
> which could previously be received only with the antenna on
> the floor.
> That's a big jump from previously trying to find an orientation (and
> position) where I could make it work. For the first time, I could
> receive signals (six channels) from an antenna atop my TV, where I
> normally get analog channels. I received three channels
> reliably from
> New Jersey. We got the same results with the classic Radio
> Shack dual
> bow-tie with reflector, but other (fancier) antennas did not
> work as well.
>
> The only channel I have previously received that I could not get this
> morning was (which we confirmed with a spectrum analyzer) off
> the air.
> Two of the other channels I could not receive are operating
> at very low
> power, and one has its transmissions beamed away from me.
>
> I now believe that any shmo with reception conditions similar to mine
> can simply take the receiver out of the box, connect a cheap loop
> antenna, stick it wherever it looks good, and start to receive ATSC
> signals from all full-power, full-pattern stations.
>
> There has been a breakthrough! YAY! Congratulations to
> LG/Zenith! Let the transition move forward!
>
> For the record, the channels I received were: WCBS-DT,
> WNBC-DT, WNYW-DT
> (which carries WWOR as a subchannel), WABC-DT, WPXN-DT, WNJN-DT, and
> WFME-DT.
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