Rob <nom...@example.com> wrote: > David Woolley <david@ex.djwhome.demon.invalid> wrote: >> On 27/04/14 17:28, Rob wrote: >>> We are setting up a co-channel diversity network. That means multiple >>> FM transmitters that are transmitting the same signal on the same >>> frequency on different sites, where the receive areas partly overlap. >> >> This problem has already been solved using COFDM (aka DAB) and it is >> much more tolerant of fading that is inevitable with co-channel >> transmitters than your system. > > It is not FM broadcast, it is (NB)FM communication.
Which makes all of this even more irrelvant as communications circuits usually bandwidth limit to around 3.5 kHz. >>> The listeners should enjoy a smooth reception while driving around. >>> So of course there should be no time lag between the modulation signals >>> of the different transmitters. Experts in the field tell us we should >>> be within 12us. >> >> Your transmitters will have to be contained within a circle of 3.6km, >> reduced by the timing errors in the modulation at 0.3km/microsecond. > > This turns out to be not the case. Networks like this have been operating > for decades, only those were constructed using analog leased lines so > there was no relation to ntp, soundcards etc. Just what part, given your original conditions, is not true about this? -- Jim Pennino _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
