Re: [time-nuts] Datum 102500-001 rubidium standard
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 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 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.
Re: [time-nuts] Datum 102500-001 rubidium standard
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. ___ 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] Datum 102500-001 rubidium standard
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.
Re: [time-nuts] Is there any way to recover if one messes up serial port on settings on HP GPS receivers?
On Wed, 17 Jun 2020 at 13:45, Tom Van Baak wrote: > Hi Dave, > There's not an easily accessible "reset to factory defaults" button > on the receiver like there is on many devices. > > Pull the AC or DC power cord. I'm curious why you ask. What state is > your 58503A that you have to resort to this? > > /tvb Thank you Tom. I had assumed that the serial port settings would be preserved in the event of a power failure. As I reported a week or two ago, Lady Heather will not communicate well with the receiver. I wondered if there was any point in trying a faster serial port speed. Lady Heather gets the time from the GPS receiver once, but then either 1) Windows reports the program is not responding. 2) The clock runs backwards. I thought it might be worth trying different serial port settings. -- Dr. David Kirkby, Kirkby Microwave Ltd, drkir...@kirkbymicrowave.co.uk https://www.kirkbymicrowave.co.uk/ Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom ___ 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.
Re: [time-nuts] Is there any way to recover if one messes up serial port on settings on HP GPS receivers?
Hi Dave, > My HP 58503A is using the default 9600 8N1 for serial communication. It > would be nice to run the connection faster Sure, but running faster is usually a red flag. What is the actual problem? Is it merely latency and timing or something else. > and there are commands to change the serial port speed, > as well as reset the serial port settings to the defaults. Yes, from 1200 to 19200. > What concerns me is that if I try to run the serial port faster, > but have problems communicating with the receiver for whatever reason, What do you mean by "problems", or "whatever reason"? The SCPI protocol is well designed. You send a command and you wait for the response. As a talker you stay synchronized with the responses. Are you writing your own code? Post a sample. > then there will be no way to reset the receiver - I could not run the command to reset it. I'm not following. There is a reset at power up. You can also simulate a reset with *rst. Under what conditions are you unable to send commands to the receiver? Is it locked up? Did it crash? Are you using flow-control? Is it your PC or the 58503 that's not responding? > There's not an easily accessible "reset to factory defaults" button on the receiver like there is on many devices. Pull the AC or DC power cord. I'm curious why you ask. What state is your 58503A that you have to resort to this? /tvb ___ 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] Is there any way to recover if one messes up serial port on settings on HP GPS receivers?
My HP 58503A is using the default 9600 8N1 for serial communication. It would be nice to run the connection faster, and there are commands to change the serial port speed, as well as reset the serial port settings to the defaults. What concerns me is that if I try to run the serial port faster, but have problems communicating with the receiver for whatever reason, then there will be no way to reset the receiver - I could not run the command to reset it. There's not an easily accessible "reset to factory defaults" button on the receiver like there is on many devices. It seems like one could get into a catch-22 situation, but perhaps there's a solution I am unaware of. Dave ___ 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.
