[opendtv] Re: Freeview business model
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 29 Jan 2007 18:46:14 -0500
Tom Barry wrote:
> Is there any power savings when modulating 2 similar channels
> on a single antenna as opposed to two antennas?
If there is a Freeview sort of service involved, there's no reason to
assume you need multiple transmitters feeding a single antenna. In
principle, markets could be assigned a contiguous set of frequencies,
and a single broadband transmitter could be used to modulate X different
6 MHz channels.
The total power would be the product of X times the effective power
dedicated to each of the 6 MHz channels.
If you had non-contiguous channels assignments, the single transmitter
would have to be even broader band, so I would expect it to cost that
much more. And then you'd want to transmitter to basically filter out
any power it might emit on the unused frequency bands.
Bert
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