I have the whole working PRR-10 system including 2 Rbs and AFAIK

Possible there is a -48 volt input DC to DC converter... if it

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

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. Thanks, -John ================ > 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 >> >> ================ >> >> >> _______________________________________________ >> 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. > > -- > Dave Emery N1PRE/AE, die@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." > >

On 08/25/2012 08:27 PM, Bob Camp wrote: > Hi > > Since you are dealing with two sources, both with random noise on them, there's no "easy" way to mathematically remove it. What you can do is to make sure you don't contribute more than you need to. Cheers, Magnus