Yes, i found that description and it put me off buying one. But there are also references on the web (including time-nuts archive) to surplus T801s with rubidium sources.
Anyway, I took a punt and bought one. So I'll find out soon :). On Mon, Jan 11, 2016 at 11:18 AM, Charles Steinmetz <csteinm...@yandex.com> wrote: > Adrian wrote: > > Are these the references with a rubidium oscillator ? They seem to have >> similar models with OCXOs etc. >> > > Tait is a manufacturer of mobile communications gear in New Zealand. The > T801 was part of a discontinued "quasi-synchronous communications system" > -- a form of simulcasting on the same frequency by transmitters at > different locations, to fill in dead spots. Tait's application was utility > and public service mobile radios (not radio broadcasting, where this scheme > has also been used). Here is Tait's basic description: > > The Tait Quasi-Synchronous Communication System works by broadcasting >> simultaneously from several transmitters on the same frequency. The >> transmitters then operate as a single transmitter giving superior coverage. >> >> A Tait T801 Frequency Referenct Module acurately maintains the frequency >> of the transmitters at each site. >> >> Where required, the T801 allows small frequency offsets to prevent the >> occurrence of static nulls in the overlap area. >> >> The T801 module may be driven from one of a number of frequency >> references, such as: >> -- Rubidium frequency standard >> -- Broadcast frequency standard >> -- Oven Controlled Crystal Oscillators (OCXOs) >> -- GPS Caesium Clock >> > > This suggests that the T801 does not have an internal frequency reference, > but rather requires a precision external reference to function. (It has a > jack labeled "INTERNAL STD OUTPUT," but that may simply be a reference that > is derived from the external standard, or a backup crystal oscillator to > keep the transmitter more or less on frequency if the external reference > signal is lost.) > > Best regards, > > Charles > > > > _______________________________________________ > 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. > _______________________________________________ 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.