Hi It’s been more than a while since I last tore into one of those beasts. My recollection is that the output modules have a set of buffer amps on them. Each buffer has filtering appropriate to the designated output frequency. One *could* convert a 5 MHz module to 10 MHz by swapping out a bunch of coils and caps. Then you need to work out the mystery of how to feed it. If the main box just has a 5 MHz OCXO and 5 MHz Rb …. not so easy. If it’s a 10 MHz main box and the 5 is divided, then indeed pretty easy.
Bob > On Jul 19, 2019, at 4:21 PM, Walter Shawlee 2 <[email protected]> wrote: > > 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 > +We're all in one boat, no matter how it looks to you. (WS2) > +All you need is love. (John Lennon) > +But, that doesn't mean other things don't come in handy. (WS2) > +Nature is trying very hard to make us succeed, but nature does not depend on > us. > We are not the only experiment. (R. Buckminster Fuller) > > _______________________________________________ > 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.
