Any one of you 1210 owners among the time-nuts who might want to sell a unit like that, please let me know. (Won't fire a missile with it ;-) SEBASTIAN STOLP GOETZHUSERWEG 165 CH5245 HABSBURG, SWITZERLAND GOOGLE EARTH: 47°28'04.15''N 8°10'06.10''E + 41 76 200 00 80 + 41 56 534 56 26
Am 10.03.2007 um 03:03 schrieb Steve Krull: > > Close, but not quite. PMEL is an acronym for Precision Measurement > Equipment Laboratory. They are metrology labs tasked with > maintenance and operation of the standards for electrical (voltage, > current, resistance, frequency, and time) as well as mechanical > standards for weight, pressure, etc. Larger labs also had optics > and radiation cal facilities. They also calibrated and repaired the > working standards and test equipment used by the rest of the base, > tenant units, and off-site facilities. I spent 8 years of active > duty time, and several more in the ANG, running the time/frequency > and RF sections of various PMELs stateside and overseas. > We used the 1210D as a transfer standard to set the timing on > everything from comm links to missile launch crypto links. We had a > time/frequency console with Cs and Rb standards, as well as HP and > Fluke VLF receivers, and a host of HP and Sulzer crystal > oscillators, and a fairly sophisticated cross-comparison system. > The 1210's were adjusted against the console, driven directly to > the silos, and rechecked on return to the lab. The specs for > allowable error over the time they were out of the lab are still > classified, even though the missile systems are gone. My last > couple of years in an air national guard unit, we switched to GPS- > disciplined timing standards to set TOD/WOD codes for the secure > air-to-air and air-to-ground comm systems. Wish I could remember > the manufacturer of the units, Magnavox I think. They were three- > piece systems in supposedly EMP-proof boxes, and took three men and > a boy to move around. > Steve Krull > > ---- Brian Kirby <[EMAIL PROTECTED]> wrote: >> PMEL is the correct term in the Air Force. It stands for Precision >> Meteorological Electronic Lab, it the branch of the Air Force that >> does >> test equipment calibration. >> >> The 1210D was standard test equipment for labs that did not have >> rubidiums and cesiums, which was quite a few. >> >> When I worked in satellite communications back in the late 70s, early >> 80s, I seen a lot of these units (1210D). We used HP cesium beams at >> the earth stations. These units were tracked back the USNO, and we >> used >> a modem to do time transfer over the air, to check the cesiums drift. >> The cal labs brought there 1210D's to our site about every 30 days to >> calibrate and sync the 1210s. >> >> Rob Kimberley wrote: >>> Hi John, >>> >>> Not heard that one before. It is always possible that there was >>> some batch >>> selection, but unaware of this during my time (July '85 to Dec '88). >>> >>> Rob >>> >>> -----Original Message----- >>> From: [EMAIL PROTECTED] [mailto:time-nuts- >>> [EMAIL PROTECTED] On >>> Behalf Of John Ackermann N8UR >>> Sent: 09 March 2007 13:29 >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] Austron 1210D Manual Update >>> >>> Rob Kimberley said the following on 03/09/2007 03:25 AM: >>>> John, >>>> >>>> The unit shipped with Austron's 1150 OCXO - a VERY nice >>>> oscillator. I >>>> also believe that they sold a bunch of these units to the US >>>> Navy for >>>> portable references to sync up Subs. >>> >>> Hi Rob -- >>> >>> I had heard mutterings that the 1150s that went into the 1210s >>> weren't quite >>> as hand-picked as the ones that went into the 1250A standard, but >>> this one >>> seems to be doing quite well. (I just got a 1250A that on a quick >>> test >>> performs at least as well as this 1210; I'll be doing a better >>> test after >>> it's had a chance to stabilize for another week or two.) >>> >>> It does appear that an awful lot of the 1210s went into various >>> military >>> applications; one of the few references I found on-line was to >>> one of the >>> PMEL (I think I got that acronym right) chat groups for the Air >>> Force. >>> >>> John >>> >>> _______________________________________________ >>> time-nuts mailing list >>> time-nuts@febo.com >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list >>> time-nuts@febo.com >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> >> >> _______________________________________________ >> time-nuts mailing list >> time-nuts@febo.com >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts