[opendtv] Re: Interesting Point
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 26 Oct 2005 16:53:11 -0400
Tony,
You are being misleading in your assumptions. In order for the newer
generation echo cancellation chips to work properly, they require as much or
more S/N as COFDM does. 8VSB only has an S/N advantage over COFDM for low
multipath environments, since the S/N requirement is relatively constant
with COFDM, but the S/N requirements for ATSC varies with the number of taps
in the equalizer that are activated.
In any case, the FCC stuck it to many stations, ours included. Our final
channel allocation after the turn off of NTSC will only allow 37 KW ERP.
Nice that these VHFs got 1 MW UHF allocations, but we UHF stations (1.3 MW
peak ERP NTSC) got very low ATSC power allocations to "replicate" our analog
service because of the myth that ATSC requires less power for equal
coverage.
Also, the Sinclair Baltimore demonstrations in 1999 proved that practically
speaking, far area reception was equal between the two systems with equal
transmitter power.
John
----- Original Message -----
From: "Tony Neece" <tonyneece@xxxxxxxxxxxxx>
> For one, for DTT COFDM requires considerably
> more transmitter power to cover the same area as ATSC.
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