Hi Jim, On Sat, May 21, 2011 at 06:56:24AM -0700, Jim Lux 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 live just adjacent to a DVB-T transmission tower, and I've visited the premises: In case of south-german DVB-T I can confirm that they have Meinberg GPS receivers for synchronizing. > I think this is being done with DVB-T in europe, maybe someone will comment? It is being done like that in DVB-T. The interesting thing to realize is that you *will* have signal cancellations inevitably for some frequencies depending on your position with respect to the synchronized transmitters, and you'll have to choose a modulation that can deal with this selective fading of subcarriers. If you also want to be resilient to errors introduced by multipath-reflections, you'll end up at OFDM which modulates *many* carriers (typically 7000 or so) at a rather low symbol rate. Then if some of the carriers get mangled, the forward-error-correction will take care. Highly fascinating, but most likely completely un-time-nutty :-) Chris _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.