[opendtv] Re: Interesting Point
- From: Bob Miller <bob@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 27 Oct 2005 02:12:44 -0400
John Shutt wrote:
>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
>
>
>
Not equal, Sinclair found that of the seven locations in question DVB-T
had initially failed all and 8-VSB had failed ONE . Upon retesting COFDM
was able to acquire a signal at ALL seven locations. COFDM was superior
in the far field.
Bob Miller
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