The UCCM modules came from Samsung WiMAX radio systems. It looks like they OEM'd the boards from both Trimble and Symmetricom. "UCCM = Universal Core Clock Module" UCCM-P = "Universal Core Clock Module - Plus". I managed to find a system description document that mentions it two or three times. No details, though. Ed On 2016-12-05 11:00 AM, Larry McDavid <lmcdavid@lmceng.com> wrote: > Does anyone know the origin of the "UCCM" designation for the Trimble > GPSDO boards recently popular here? > > Is "UCCM" a valid model number, is it an acronym or is it something else? > > I've packaged several of these Trimble boards and I've seen about four > others, none of which was marked "UCCM." I've seen one on-line picture > of a packaged board that shows a separate label with "UCCM" marked. > > GPSCon already supports these "UCCM" boards and the next release of Lady > Heather is expected to support them also, so there is some acceptance of > this "UCCM" designation. But, what is the origin of this term and is it > valid? > > -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los > Angeles, near Disneyland)

Well, that actually helped a little. I dug a little further into the system documentation, and while there is only a smattering of information on the UCCM itself, I was able to find that the alarm parameters for them dictate a 5.2-5.8v supply range, so THAT finally definitively answers one of the things that’s only been guessed at before. I also found a statement of ‘Stability: .02 ppm’, with no other qualification. If I find anything more of interest I’ll post it. Paul > On Dec 5, 2016, at 12:58 PM, Ed Palmer <ed_palmer@sasktel.net> wrote: > > The UCCM modules came from Samsung WiMAX radio systems. It looks like they OEM'd the boards from both Trimble and Symmetricom. "UCCM = Universal Core Clock Module" UCCM-P = "Universal Core Clock Module - Plus". I managed to find a system description document that mentions it two or three times. No details, though. > > Ed > > On 2016-12-05 11:00 AM, Larry McDavid <lmcdavid@lmceng.com> wrote: >> Does anyone know the origin of the "UCCM" designation for the Trimble >> GPSDO boards recently popular here? >> >> Is "UCCM" a valid model number, is it an acronym or is it something else? >> >> I've packaged several of these Trimble boards and I've seen about four >> others, none of which was marked "UCCM." I've seen one on-line picture >> of a packaged board that shows a separate label with "UCCM" marked. >> >> GPSCon already supports these "UCCM" boards and the next release of Lady >> Heather is expected to support them also, so there is some acceptance of >> this "UCCM" designation. But, what is the origin of this term and is it >> valid? >> >> -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland) > > _______________________________________________ > 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.