Nice acquisition! Rob K
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Magnus Danielson Sent: 06 July 2010 09:41 To: Discussion of precise time and frequency measurement Subject: [time-nuts] FRK and TS-105A Hi! Could somebody from the top of their head give me the most useful pointers on FRK rubidiums? I now have one as part of a box, and naturally I want to stash up on the information. The rubidium locks nicely, if just patiently sitting there and waiting, and the designers of the box was nice enough to dedicate a status view to the rubidium monitoring voltages and lock status. The box itself is a Ball Efratom TS-105A measurement box, which crunches out frequency offsets and allan variances for 100 ms, 1 s, 10 s and 100 s directly on the screen. All under the control of the awsome CPU powers of 6502. The box works, but I am trying to collect info on it. The box will run in either single mixer or double-mixer mode. It accepts 5 MHz and 10 MHz. Each counter channel receives a signal conditioned input and 10,00001 MHz from the Rubidium. It hits the mixer after an ECL driver and is then amplified in LM108 and comparator LM111. From there will a cascade of TTL chips count it, presumably in the 10 MHz from the rubidium. For 1 s this gives a resolution of 1E-7/1E6 = 1E-13 which isn't too shabby. The only SMD component seen so far is the cap sitting directly on the mixers terminals. I have not retraced the card in detail so far, just looked at it breefly (out of curiosity naturally). If someone has manuals for the TS-105A I will be happy, TvB has promised to locate his.. This box is from 1985, so it is not cutting edge, but it is functional, direct and a bit fun, so why not. :) It would be fun if it could crank out the observables directly on serial port or so... My beast doesn't have the GPIB interface. It may be a matter of hooking up a cable, but in that case it is undocumented. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
