[opendtv] Re: Doug is Missing the Point
- From: "Ian Mackenzie" <ian@xxxxxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 16 Feb 2006 20:34:35 +1100
Doug
You have it wrong as usual.
I said "Gap Fillers" which are what is=20
used to extend a SFN in a COFDM system.
They don't cost anymore than any repeater
And are very effective.
If you need multiple high power stations then
It is necessary in some cases to have a=20
microwave feed between the sites but you=20
would need that in ATSC wouldn't you?
The coverage of Sydney uses a SFN on UHF from
Multiple transmission sites which are fed
From the digital transmission on VHF off air.
No microwaves, no fibres, etc.
Simply it works.
As to transmitter costs the cost for a DVB
Transmitter is identical to an ATSC transmitter
It just uses a different modulator.
The nationwide SFN is ridiculous, just like=20
the thought of covering the USA in ATSC.
In Australia anyone, anywhere can get the=20
networks in digital if not FTA VHF or UHF
Then on satellite.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of Doug McDonald
Sent: Thursday, 16 February 2006 8:26 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Doug is Missing the Point
Ian Mackenzie wrote:
>
> where the people are.
>=20
> This is where Doug doesn't understand what COFDM is all about.
> Why put an "Earth Scorcher" in a remote location to cover a population
> density that probably meant 10 watts or more per viewer when a COFDM=20
> SFN transmitter nearby will give better coverage.
Well yes, that is what COFDM can, in some cases do.
BUT ... what ATSC is about is serving everybody in every ranch house,
WITHOUT added 10 watt transmitters ... which cost a BIG bundle with
COFDM SFN ... an SFN station costs a whopping big amount to set up,
whether it is one watt or 5000 watts. Only for really big powers or big
sticks does the price rise. It is FAR more expensive than a translator
or repeater, because it requires a feed that must come over microwave or
fiber, and expensive synchronization equipment.
As to Australia ... what fraction of it is ACTUALLY covered ...
ALL PROGRAMS ... by SFN?
Doug McDonald
=20
=20
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