In an eBay search I found several PC-10s for sale. One of them had a Ball logo as part of the model/serial number sticker.
Ball Efratom Division PC-10 Portable Clock ATOMIC CLOCK Don Resor N6KAW Sent from someone's iPhone > On Nov 1, 2019, at 12:04 AM, David Bliss <[email protected]> wrote: > > After many yeaqrs admiring form afar, I've acquired my first > piece of timenuttery, an Efratom PC-10 portable rubidium clock, S/N 101 > (possibly the first production unit?). It has the usual decade sine > and ttl outputs plus a front panel intervalometer or clock, or at least > that's as much as I've figured out since it came with no documentation > whatsoever > > It warms up, the unlock light and crsytal adjust lights go out, and it > seems to keep time as accurately as anything I can measure it against > (no surprise). The 10MHz output beats dead on to my recently retuned HF > rig. > > It's a great little unit but I could use some more information on e.g. > the phase shift adjustment which seems to allow you to discipline it > with a front panel 1PPS input but isn't super obvious, as well as > maintenance, calibraiton, and test. > > As far as I can tell Microsemi, who bought Microchip, who bought > Symmetricom, who bought Datum, who bought Efratom, have never heard of > this adorable little beast, nor has the internet. Google image search > mostly returns pictures of my unit (I know there's at least one other > one out there as it has a different front panel switch). > > It's based on an Efratom FRK-H oscillator, but does anyone know anything > at all about the PC-10 specifically? I'd love any docs you have. > > Some quick and dirty photos at > https://www.flickr.com/photos/9100973@N06/albums/72157711587895206 --more to > come. > > thanks, > david n8qg > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
