[time-nuts] Tait reference

Adrian Godwin artgodwin at gmail.com
Mon Jan 11 08:11:18 EST 2016


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 <csteinmetz at 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
>
>
>
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