Hi,
On 2019-02-03 23:07, John Ackermann N8UR wrote:
I've been playing with a Frequency Electronics 5608A "Frequency
Standard." It's a 2U rack mount beast with battery pack and a module
labeled as a 10 MHz Rb standard, and another as a 5 MHz VCXO.
I originally thought that the VCXO was a cleanup oscillator for the
Rb, but that doesn't seem to be the case. As best I can tell, the Rb
module accepts a 10 MHz *input* and its output is a control voltage
that goes to the VCXO. The 5 MHz VCXO goes through a doubler to send
10 MHz to the Rb, and has distribution for a bunch of 5 MHz and 1 MHz
outputs on the rear panel. There are no 10 MHz outputs.
The "LOCK" indicator on the front panel lights up. Early tests
indicate that the short term stability is pretty good, but it has a
bathtub shaped aging curve that's more like a crystal than an Rb.
Google doesn't turn up any hits on this model number. Has anyone here
encountered one of these guys and know what it was used for, or have
info on the design?
I have encountered one and helped a fellow time-nut to debug-it.
Yes, you input 10 MHz into the rubidium and it outputs the OCXO EFC.
It's very obvious and not too hard to follow the signals around with a
bit of tinkering once the 10 MHz input part is clear.
Turned out that the rubidium part had a really bad part (thin-film based
"chip") which was not easily replaceable.
I kind of like it. No clue what it was used for.
I was unable to get it to run, so no measurement of performance. Pitty.
Cheers,
Magnus
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