Hi David:
Since the counter is a Systron Donner (not the SRS 620) I expect that
the PRS10 is being used in the mode where it emulates an Efratom
Rubidium brick. I.e. the 1 PPS GPS input is not active in this mode
although the counter may be able to be modified to add the 1 PPS input,
1 PPS o
I don't know if this is of interest to anyone, but there is an 18
(perhaps 24) GHz microwave counter on eBay fitted with a Standford PRS10
rubidium atomic standard oscillator.
Bidding starts at $600, but it now of $675.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7532603759
I paid $450