[time-nuts] Datum PRR-10 Info

J. Forster jfor at quikus.com
Sat Aug 25 23:41:21 UTC 2012

Hi David,

I just got the Rb plug-in module, not the whole system.

The PCB has a small, unidentified DC/DC converter. The markings are
probably under the cemented-on heatsink.

There is also a potted transformer, which may be a common-mode choke.

All I'd really like is a schematic of the PCB. I expect the board is not
particularily useful.




> On Sat, Aug 25, 2012 at 11:41:21AM -0700, J. Forster wrote:
>> Hi,
>> I recently picked up the Rb module from a Datum PRR-10 Precision
>> Reference
>> Receiver.
>> The Rb connections are pretty obvious, but does anybody have any info on
>> the rest of the module? Even a schematic would help.
>> I'm trying to decide whether the PCB has anything useful on it.
> 	I have the whole working PRR-10 system including 2 Rbs and AFAIK
> that PCB just contains redundant power and provisions for passing a
> couple of status bits from the RB (lock I think)... if you have a PRR-10
> system it would be useful, but I'm not sure it is otherwise.
> 	Possible there is a -48 volt input DC to DC converter... if it
> would be useful I go go look at one of mine to refresh my memory.
> 	The heat sink is useful with the LPRO RB of course.
> 	I assume you bought it for the LPRO...
> 	You may not be aware, but the system is designed to use a DDS to
> offset the frequency of a free running 10 MHz source to make it accurate
> based on GPS timing ... so the Rb is not disciplined with its C field or
> similar - it is free running.
>> Thanks,
>> -John
>> ================
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> --
>   Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass
> 02493
> "An empty zombie mind with a forlorn barely readable weatherbeaten
> 'For Rent' sign still vainly flapping outside on the weed encrusted pole -
> in
> celebration of what could have been, but wasn't and is not to be now
> either."

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