[time-nuts] Datum 102500-001 rubidium standard

[Taka Kamiya]

I just did a quick look-see.
Looks like Datum is a manufacturer
102500-001 is a part numberLPRO is a model
As far as I know, LPRO and LPRO-101 are the same unit.  The exact same design went through several ownership.
I have a few of those.  What's nice about it is EFC (electronic frequency control), aka fine tuning by external potentiometer spans very narrow frequence range.  It makes very nice to make precise adjustment.  Anything beyond that, there is an internal adjustment.  I have one that has an access hole on cover, I have another there isn't a hole but adjustment is inside.
More than likely, you won't need to touch those.
For first time, lock could take like 10 minutes.  That time gets shorter as you use them and eventually, 2 minutes or so for locking.

If it was sitting unused for a while, before making any adjustment, attach it to a reasonable sized heat sink and run for a month or more.  Frequency will drift back to spec in this period.  Please do not start adjusting too soon, as these internal pots have limited number of time you can adjust.  (not made for excessive use)
By the way, you got it for free?  Lucky you!
--------------------------------------- 
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
 

    On Wednesday, June 17, 2020, 4:50:56 PM EDT, Rick Commo <rick.commo at frontier.com> wrote:  
 
 I was given a Datum 102500-001 Rubidium standard today.  Searcing the Web for a manual for this particular model yielded nothing but I did run across a manual in PDF form for their LPRO unit.  I read through  and suspect that it might be more or less applicable to the unit I have.  At least the connector has the same number of pins and layout.

Does anyone on the list have more info on this unit that you can share with me.  I grabbed it up because it was free and came with a 24V switching supply.  As I find time I want  to build a GPSDO for my ham shack; but this could serve in the interim.

The current extent of my knowledge of these devices is knowing how to spell rubidium and that they are/were used as secondary time sources.  I will be doing research over the next few days trying to come up to speed; but any advice from the hive-mind of this group will be appreaciated.

Cheers & thanks,
-rick, K7LOG





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