[opendtv] Re: Why?
- From: "John Willkie" <JohnWillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 8 Mar 2005 09:12:39 -0800
Yeah, I guess I was spouting all over the place.
The reference bit stream issue presses me all the time, since I'm now using
off the air streams to develop a PSIP test & measurement system, and finding
much problems in what people transmit.
Wait a second: the lack of these bit streams will drive the market for PSIP
t&m. Never mind!
John Willkie
----- Original Message -----
From: "Mark A. Aitken (Webmail)" <maitken@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>; "John Willkie" <JohnWillkie@xxxxxxxxxx>
Sent: Tuesday, March 08, 2005 4:11 AM
Subject: Re: [opendtv] Why?
>
> I submit, given your brief description of location, that your issues may
have
> much more to do with lack of a receiver specification (in your case
overload
> related) more than anything else. I look at the whole (hole?) lack of
> reception equation, and see a sea of problems. It's like "whack-a-mole",
punch
> one down, the next one pops up. Let us (for the sake of limiting argument)
> presume equalizations issues are no longer on the table.
>
> I have been doing a good deal of work at the private RF laboratory of
Charles
> Rhodes. It is clearly the case that performance of the tuner is suspect in
> many areas where multipath is not at fault. If you have been following Mr.
> Rhodes TV Technology articles (here is just one such article...I highly
> recommend looking them all
>
up...<http://www.tvtechnology.com/features/digital_tv/SignalBehavior.shtml>)
,
> a compelling case is being stacked up that points to internally generated
IM3
> (third order intermod) and (in some cases) X-M (cross mod) as main
culprits
> particularly in moderate/high input level environments.
>
> The ATSC A/74 "Recommended Practices" document
> (<http://www.atsc.org/standards/a_74.pdf>) inadequately (in my opinion)
> addresses the requirements to reasonably assure reception. Much more needs
to
> be done if we are to save OTA for ANY type/kind/standard of digital
> television...
>
> Quoting John Willkie <JohnWillkie@xxxxxxxxxx>:
>
> > Rather than going on whining about receiver issues (at home in TJ, my
> > b2c2 card picks up San Diego DTV stations with about 15-21 SNR, but not
> > the one in TJ; at my mother's house, my b2c2 picks up the TJ DTV station
> > with 15 db SNR, but not the San Diego ones. The TJ station is less than
> > 3 miles from my home; most of the San Diego DTV stations are less than 5
> > miles clear line of sight from mom's home.)
> > So, rather than whining, I would like to know from people who were there
> > (this is not a speculative issue);
> >
> > Why, when the specs were adopted, there were no (and still are no):
> >
> > ATSC reference bit streams;
> > ATSC receiver specifications (there are only recommendations now);
> > Exemplars of bad bit streams (I have recently acquired some "off the
> > air" as pertains to PSIP).
> >
> > Was the issue anti-trust/restraint of trade? Or were there more
> > nefarious matters afoot? It seems to me that the current state amounts
> > to a restraint of trade just by itself.
> >
> > John Willkie
> >
> >
> > ----------------------------------------------------------------------
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>
>
>
>
> Regards,
>
> Mark A. Aitken
> Director, Advanced Technology
> ***************************
> Sinclair Broadcast Group
> 10706 Beaver Dam Road
> Hunt Valley, MD 21030
> Business TEL: (410) 568-1535
> Business MOBILE: (443) 677-4425
> Business FAX: (410) 568-1580
> maitken@xxxxxxxxxx
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