One nice thing about the older Efratom standards like the FRK and M100
is that full schematics and circuit descriptions are available. They
are easy to service because they're completely analog (no processor) and
they're built with through-hole components, most of which are readily
available (other than special things like the crystal, Rb lamp, etc.).
I bought two units that are about 25 years old. Neither unit would
lock. Both turned out to be simple repairs. YMMV
Ed
Brent Gordon wrote:
I'm considering buying a rubidium standard, not that I really need
one, just because I'm a Time Nut. I have some questions on what to
look for and what to watch out for. I'll probably get one from either
fluke.l or flyingbest on ePay.
I know that they wear out. Is there any model I should look for or
avoid? I see both Efratoms and Datums; some of the auctions claim
more lamp life left for the Datums.
I know that the mating connector for the rubidiums with an RF inside
the d-sub connector are expensive. Is it really needed or is the
header connector good enough?
Some of them come with an output board (290295929282). Does this get
me anything other than a Type-N output and a mating connector for the
RF d-sub? Why is this one cheaper than just a rubidium?
A programmable frequency output, such as this one (eBay item
290301888238), might be useful. Is it worthwhile or more trouble than
it's worth?
Are there any gotchas I should be aware of?
Thanks,
Brent
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