[opendtv] Re: From Ed Reitan
- From: "Adam Goldberg" <adam_g@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 18 Dec 2007 18:40:58 -0500
Hmm. I was blaming windy condition problems on a antenna installation that
is susceptible to wobbling in the wind. This seems more likely (at least in
my case) than a RF culprit.
Adam Goldberg
adam_g@xxxxxxxxx
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Allen Le Roy Limberg
Sent: Tuesday, December 18, 2007 6:00 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: From Ed Reitan
The comment on wind is interesting. Presumably wind gusts buffeting the
antenna cause dynamic multipath problems the adaptive equalizer cannot
follow.
Doug McDonald and I are still trying to sell our patent to an adaptive
equalizer that does not depend on autoregressive techniques to adapt the
equalizer. Instead, the channel characteristics are computed by self
correlation of a-few-thousand-symbol blocks of 8VSB data.
The approach is probably preferable to larding up the 8VSB signal with
further training signals.
Al Limberg
----- Original Message -----
From: "Adam Goldberg" <adam_g@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, December 18, 2007 3:19 PM
Subject: [opendtv] Re: From Ed Reitan
> With a rooftop mounted UHF-only antenna pointed midway between two tower
> sites (I'm in Northern VA, pointed at the DC towers), the only time I have
> reception problems are when it's terribly windy out. Otherwise, I get
only
> an occasional glitch, which is about the same glitch-free-ness that I get
> with my Dish Network programming.
>
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On
> Behalf Of Allen Le Roy Limberg
> Sent: Tuesday, December 18, 2007 3:00 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: From Ed Reitan
>
> Interestingly, we see the same thing on our 15" analog TV down here in
> Suncoast Florida. So, I suspect some of the problem is on network feeds,
> rather than an 8VSB OTA problem.
>
> Al
>
> ----- Original Message -----
> From: "Mark Schubin" <tvmark@xxxxxxxxxxxxx>
> To: "Open DTV Forum" <opendtv@xxxxxxxxxxxxx>
> Sent: Tuesday, December 18, 2007 12:49 PM
> Subject: [opendtv] From Ed Reitan
>
>
> > John,
> >
> > I have told you of my futile experiments with ATSC HDTV
> > reception. I was there from the beginning with ATSC since 1999
> > and have continually found reception with blocking (aka tiling)
> > and complete drop out artifacts to be difficult if not possible
> > to achieve. This was through the first generation Panasonic
> > boxes, my second generation Sony KD-34XBR2 set, and my latest
> > third generation Sony KD-34XBR960 Super Fine PitchT XBR - the
> > last great CRT HDTV receiver (they went to a less resolved
> > Trinitron in the 750).
> >
> > With the KD-34XBR2 receiver, I had a 34 foot high Winegard
> > antenna on a two story building in Westwood, and unless I turned
> > the antenna in azimuth directly to Mount Wilson, I would have
> > occasional blocking.
> >
> > With every generation of ATSC receivers and continual problems,
> > they have repeatedly said the "next generation" of chips would
> > solve the problem. Sinclair argued at the start of ATSC to
> > shelve it and adopt COFDM modulation - they were accused of just
> > dragging their feet to save new transmitter cost, but I am
> > beginning to suspect they were right. But the problem has still
> > not been solved.
> >
> > So on nights when the cable has problems, I tune my KD-34XBR960
> > to direct reception and use a UHF loop. I can see the red lights
> > of the four Omaha towers with my eye out the window from the
> > receiver - but I still get blocking and complete drops outs. The
> > system just does not work, except with a perfect signal.
> >
> > Maybe someone from Zenith, on the distribution, has some comments
> > regarding the problem.
> >
> > Ed Reitan
> >
>
>
>
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