[time-nuts] Efratom PC-10

[David Bliss]

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