[opendtv] Re: Demand for free DTV rising in Australia
- From: "johnwillkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 27 Jun 2007 14:25:15 -0700
John;
That's simply FALSE.
AutumWave has a USB dongle that is fifth-generation.
Dimanod Vision ahs a USB dongle that is fifth generation.
Last I heard, there aere about two dozen others being marketed.
Neither is a STB, athough I could probably dig up some old plastic to pad
them out, but they would cost more than the $89 I paid for the diamond
visison. However, neither is a tv set either.
My diamond vision doesn't give composite or audio out (in hardware), but it
does have comp and s-vid in. Of course, one can plan with the USB output
and route it to ..
Silver Sensor? I just paid $13 for a 2-bay panel reflector. I'll probably
pay for a VHF as well. I now get all but one SD DTV station, and most of
the Tijuana ones, even though I'm less than 2 miles from the tx site.
Oddly enough, I get the same number of SD dtv stations by using the 4 inch
atenna that comes with the dimanonvision, mounted in the center of my
apartment, and hooked up to a second-generation MyHD card.
In other words, you can't tell the FUD from the truth without testing.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de John Shutt
Enviado el: Monday, June 25, 2007 9:56 AM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Demand for free DTV rising in Australia
Barry,
5th gen set top boxes exist on paper, but no on US shelves. If you wish to
demo a 5th generation chip, you must purchase an integrated display.
We did purchase several Sharp Aqua's LCD monitors with ATSC tuners, and I
did play around with them before installing them in classrooms. I have no
idea what generation the chipset is, or if it was simply the cheapest
chipset that Sharp could use to meet the FCC Tuner mandate.
In any case the performance using a Silver Sensor was better than the
"second generation" Samsung in my office. I could not get any more
channels, but the placement of the antenna was not as critical. It was not,
however anything close to what was described in Baltimore in 1999 for DVB-T.
Besides, as I have tried to explain to Bert several times over the years,
even if all of ATSC's reception problems were solved, I'd still be
advocating for DVB-T simply because of the huge knob on the side of the
transmitter it gives the broadcaster. At one end of the knob's scale is
"robustness" and at the other end of the scale is "bitrate." each
broadcaster is free to turn that knob to the spot that best suits his
market, his business model, his power level, and his present conditions.
Imagine a broadcaster that must use a standby antenna and transmitter while
the main unit is being serviced. Turn the knob towards "robustness" and you
won't lose coverage area due to the lower power. Your tradeoff is to reduce
the bitrate on your multiplexed channels, or temporarily drop one channel of
the multiplex.
Then there is the ability to use DVB-T in a mobile environment without any
special modifications. Bob Miller's video proved that. Then there is
HM-COFDM that allowed a very robust stream buried within the normal
bitstream, with much less bit loss than AVSB or MPH. Then there is DVB-H
which is essentially just a time division multiplex of the data so handsets
can turn on and off their receivers at known intervals to save power.
Combine DVB-H with HM-COFDM and every broadcaster could be transmitting
directly to mobile receivers.
And finally, and I have pointed out over and over again, DVB-T product is
widely available worldwide. Portable 7" LCD DVB-T receivers/DVD players are
available, the USB thumbdrive style of DVB-T receiver was available two
years before the first ATSC type was available, and even so you have a
better chance of using the DVB-T version on a bus or in a car than you do
the ATSC type.
ATSC is inferior to DVB-T as a system. 8-VSB is inferior to COFDM as a
modulation method in dynamic multipath. Putting an inferior service with an
inferior modulation method is the worst of both worlds.
John
----- Original Message -----
From: "Barry Wilkins" <barry.barrywilkins@xxxxxxxxx>
> Quite right Bert,
>
> I haven't asked John why he has not tried more than a second generation
> ATSC
> receiver so here goes.
>
> John - why haven't you?
>
> And to the others who have, has it made a significant difference?
>
> Can you now cruise along with perfecto reception of ATSC in a built up
> area?
>
>
> Does the latest ATSC receiver still work until you shut it in a
> transmitter
> cabinet? (Joke)
>
> Yes, I understand there has been improvement. Time will tell and not much
> of
> that left.
>
> Regards
> Barry
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