How successful or possible is DVB-T as ATSC TV DX? Transmitter power on average is 1/3 less than PAL or NTSC...

How successful or possible is DVB-T as ATSC TV DX? Transmitter power on
average is 1/3 less than PAL or NTSC...

On Jul 2, 2:47*am, "Max Power" wrote:
How successful or possible is DVB-T as ATSC TV DX? Transmitter power on
average is 1/3 less than PAL or NTSC...

Are you asking whether a DVB-T receivers can also receive ATSC?

Not normally. Although here's something you might investigate:

http://www.globalsources.com/gsol/I/...0000085615.htm

Bert

Have people been trying to do DVB trans-Atlantic TV DX, or visa versa with
ATSC?
For EME (Earth Moon Earth) TV DX, the expected typical path loss is 309db.

I would love to see the math for what parameters are needed for EME
broadcasting for either DVB-T or ATSC.

I would imagine that a 100 kw transmitter on the UHF low band, with a dish
antenna that has 37dbi gain might work, providing it was coupled with moon
tracking.

Yes, using something like Arecibo to do this would help ... but a 20m dish
might suffice.

====================
Not what I was looking for, but I requested info on it anyways...
//////////////////////
How successful or possible is DVB-T as ATSC TV DX? Transmitter power on
average is 1/3 less than PAL or NTSC...
Are you asking whether a DVB-T receivers can also receive ATSC?
Not normally. Although here's something you might investigate:
http://www.globalsources.com/gsol/I/...0000085615.htm
////////////////////
====================

On Thu, 03 Jul 2008 23:20:36 -0700, Max Power wrote:

Have people been trying to do DVB trans-Atlantic TV DX, or visa versa with
ATSC?
For EME (Earth Moon Earth) TV DX, the expected typical path loss is 309db.

Are there any DVB-T stations on Band I? On Band III? (I rather doubt it,
and I see little to no chance of trans-Atlantic propagation on UHF without
the use of EME (or artificial satellite...) techniques.

I know of nobody trying it with ATSC.

I would love to see the math for what parameters are needed for EME
broadcasting for either DVB-T or ATSC.

I would imagine that a 100 kw transmitter on the UHF low band, with a dish
antenna that has 37dbi gain might work, providing it was coupled with moon
tracking.

There has been some success in detecting NTSC (analog) UHF *carriers* via
EME, and even identifying which stations were involved. (by precise
measurement of frequency and of the times the signal came over the horizon
& vice-versa)

I think we're WAY, WAY short of being able to decode anything that way,
though with Arecibo I wouldn't rule anything out!

Doug Smith W9WI wrote:
|| On Thu, 03 Jul 2008 23:20:36 -0700, Max Power wrote:
||
||| Have people been trying to do DVB trans-Atlantic TV DX, or visa
||| versa with ATSC?
||| For EME (Earth Moon Earth) TV DX, the expected typical path loss is
||| 309db.
||
|| Are there any DVB-T stations on Band I? On Band III? (I rather
|| doubt it, and I see little to no chance of trans-Atlantic
|| propagation on UHF without the use of EME (or artificial
|| satellite...) techniques.
||

From the TV point of view VHF has been relatively redundant in the UK since
about 1970 and was officially closed down in 1982, however I'm pretty
certain that early BBC1 405 line transmissions on Band 1 were occasionally
received in the U.S. during the 1930s.

"Ivan" wrote in message
...

snip

From the TV point of view VHF has been relatively redundant in the UK
since
about 1970 and was officially closed down in 1982, however I'm pretty
certain that early BBC1 405 line transmissions on Band 1 were occasionally
received in the U.S. during the 1930s.

The formal coronation of Queen Elizabeth II was televised here in the US,
but not live. I was ten at the time and I my interest in 'trons was already
in bloom. Shortly after the ceremony, I recall reading that a large
receiving array was constructed on the eastern tip of Long Island in an
attempt to receive the signal live. (The story did not, as I recall,
describe any corresponding transmiting array anywhere in the British Isles.)
I remember reading that only the faintest signals were received over here.
The broadcasters took a gamble, but it wasn't in the cards. The CBC crew
were the first to arrive home with film.

By contrast, the wedding of Charles and Diana was carried live in North
America by at least three networks.

On Fri, 04 Jul 2008 23:15:49 +0100, Ivan wrote:
From the TV point of view VHF has been relatively redundant in the UK since
about 1970 and was officially closed down in 1982, however I'm pretty
certain that early BBC1 405 line transmissions on Band 1 were occasionally
received in the U.S. during the 1930s.

http://www.apts.org.uk/recording.htm

It seems RCA succeeded in receiving - and recording - the Crystal Palace
BBC-TV transmitter, from a receive site somewhere on the U.S. East Coast,
in 1938.

They were received worldwide postwar, though I don't know if anyone got
any video. (most reports I saw were of the aural transmitter only)