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
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