[time-nuts] What are these towers?

Magnus Danielson magnus at rubidium.dyndns.org
Sat May 21 17:34:37 EDT 2011


On 05/21/2011 03:56 PM, Jim Lux wrote:
> On 5/20/11 11:51 PM, cook michael wrote:
>> Le 21/05/2011 08:30, Robert Darlington a écrit :
>>> Guys, I gotta ask, what does this have to do with time keeping? Am I
>>> missing something?
>>>
>>> -Bob
>>>
>> I know what you mean. I was desperately fighting down the urge to reply
>> to Lamar's post to query the significance of cows and horses.
>>> On Fri, May 20, 2011 at 9:59 PM,<W4wj at aol.com> wrote:
>>>
>
>
> there *is* a sort of tangential connection. One of the more interesting
> strategies in broadcasting these days is forming coverage areas with
> arrays of geographically dispersed transmitters, all synchronized well
> enough that the signals received from all transmitters are appropriately
> synced.
>
> I think this is being done with DVB-T in europe, maybe someone will
> comment?

It is. The DVB-T SFN mode is a nice thing. Being used in several countries.

> In any case, it requires a fairly decent synchronization to make this
> work at UHF frequencies.

Weeell. not too serious. Manageable I'd say. Consider that the COFDM 
method has a gap between symbols essentially allowing for reflections to 
"ring out" and part of this gap is used to handle transmitters 
time-errors. It works well in reality.

Cheers,
Magnus




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