[opendtv] Re: The "real" problem with OFDM in the U.S.

At 1:33 PM -0800 3/8/05, Dale Kelly wrote:
>Bert wrote:
>>  So bottom line, if you have to cover large markets
>>  while making efficient use of frequencies, big sticks
>>  are a reasonable approach. Especially if these can be
>>  assisted by on-channel repeaters, to improve the
>>  signal level in challenged locations.
>
>You have it right, in my opinion.
>Many large big stick markets have marginal DTV C/N in the more distant or
>shielded portions on their market. This condition can impact a significant
>portion of their total coverage area, where significant population clusters
>might exist. Properly designed on channel repeaters, together with advanced
>receivers such as the 5G, can significantly increase useable C/N ratios to
>these locations and greatly simplify the antenna system hardware required to
>achieve reliable service.
>Of course, as you say, such a system must be designed without creating
>additional interference and that can often be accomplished.

I tend to agree with Dale that a big stick with gap fillers would be 
the appropriate solution for HIS market.

Perhaps Dale can expand on the issue of market overlap in the area he 
serves  - I believe it is Seattle.

What is the overall size of the market (geographically - not population)?

What are the adjacent markets, and the distance to their transmitters?

Would his station take advantage of an SFN to deliver sub-market 
services to the communities within the larger coverage area? This 
assumes that the repeaters would not simply replicate the big stick 
signal, but rather, would be on different channels so that local 
content and commercials could be inserted into the programming 
originating from the main transmitter, AND that localized content 
could be delivered on sub-channels of the multiplex.

As I continue to explain, each market is unique and the design of the 
transmission network must be optimized ofr the market conditions.

Regards
Craig
 
 
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