[time-nuts] Efratom MFS system Questions

[Walter Shawlee 2]

I got a nice system a while back (Modular System *808-400-14*) with both 
rubidium and crystal oscillators.
I am getting some faults showing up, and need some insight into system 
operation and how to fix it.

I got all the docs on the FEBO site which were very helpful, but they do 
have have answers to my most pressing questions. These are issues I am 
trying to solve:

*MBF front and rear modules:* The front unit (no jacks, only a fault 
light) seems to be what sets the division for rear buffers (yes/no?) 
however, I cannot see any relationship to the alphanumeric part numbers 
in the FEBO docs, and the all numeric parts numbers on the actual units. 
Is there anything explaining what module number is what type?  Can the 
rear buffers be of different types, for say 5Mhz, 10Mhz, etc. all in one 
frame, or does the front MBF module set the *only* frequency available?  
I am getting a fault light on the front unit, and back ones are 
outputting a varying (wrong) frequency.  the rear buffers are nominally 
5Mhz, can I make them 10Mhz through any mods?  seems like it should be 
possible if I had the manual for this module type.
*
**MXO Crystal Oscillator module:* How is this adjusted?  I can see no 
access, and it is off frequency. I can't imagine a way to set it out of 
the frame, so it feels like a way must be possible to do it while 
installed, but what is it? I found the info for adjusting the Rubidium, 
so I feel it must be out there somewhere.

*Is there any hope of manuals for any modules?* *How about connector 
maps or frame drawings?* Efratom became Symmetricom, then Microsemi, and 
now everything MFS related seems to be lost. Two days of web searching 
did not turn up anything useful, so I am hoping someone has info on the 
list they are wiling to share. *Any chance of module extender cables?**
*
any help appreciated, as this is a wonderful unit that cries out to be 
fully operational in my lab. I am happy to send parts from two *Efratom 
1PPS Drawers* I have (with *MDP/MPS/BFM/ACI* Modules-black in color, 
probably not compatible with the MFS units) to anybody that has useful 
info or parts to share.

all the best,
walter

-- 
Walter Shawlee 2
Sphere Research Corp. 3394 Sunnyside Rd.
West Kelowna, BC, V1Z 2V4 CANADA
Phone: +1 (250-769-1834 -:- http://www.sphere.bc.ca
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