Empathy List Archives

RC

Rick Commo

Wed, Jun 17, 2020 8:39 PM

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

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

MW

Matthias Welwarsky

Wed, Jun 17, 2020 10:23 PM

On Mittwoch, 17. Juni 2020 22:39:38 CEST Rick Commo 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.

It's an LPRO-101 under a different label. I have a similar one, Datum
102589-001, a sticker on the side reads.

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.

If you open up the cover (can be done with removing the two front screws and
then gentle pulling of the contact plug), you'll see that the inside matches
exactly the LPRO-101 manual that's floating around on the web.

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.

There's not much to it. Just connect the 24V supply and after a couple of
minutes you'll have a stable 10MHz sine output on the respective pin. You
could check the lamp voltage to be in the expected range but that's about it.

BR,
Matthias

Cheers & thanks,
-rick, K7LOG

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow
the instructions there.

On Mittwoch, 17. Juni 2020 22:39:38 CEST Rick Commo 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. It's an LPRO-101 under a different label. I have a similar one, Datum 102589-001, a sticker on the side reads. > 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. If you open up the cover (can be done with removing the two front screws and then gentle pulling of the contact plug), you'll see that the inside matches exactly the LPRO-101 manual that's floating around on the web. > 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. There's not much to it. Just connect the 24V supply and after a couple of minutes you'll have a stable 10MHz sine output on the respective pin. You could check the lamp voltage to be in the expected range but that's about it. BR, Matthias > > Cheers & thanks, > -rick, K7LOG > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow > the instructions there.

TK

Taka Kamiya

Wed, Jun 17, 2020 10:31 PM

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@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

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.

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@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 _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

time-nuts@lists.febo.com

Datum 102500-001 rubidium standard