[time-nuts] Efratom MFS system

Bob Camp lists at rtty.us
Mon Nov 26 00:34:46 UTC 2012


HI

Going from memory (never a good idea…):

1) There is a manual adjust on the MXO to line the EFC up so it's in range to lock.
2) The holdover / lock module is pretty simple, just a PLL running into a DAC. Holdover = freeze the DAC.
3) They aren't the most reliable thing Efratom ever made….

Bob

On Nov 25, 2012, at 11:15 AM, John Ackermann N8UR <jra at febo.com> wrote:

> At a recent hamfest, I picked up an interesting looking Efratom "Made in Germany" MFS modular frequency standard system.  It's basically a GPS disciplined FRK Rubidium with XO fail-over and a whole bunch of RF and PPS outputs, in a *very* heavy box.
> 
> I've had a chance to play with it a bit and take some measurements, and was able to find some (but not a lot) of documentation on the web.  I've put it all at http://www.febo.com/pages/efratom_mfs/index.html for your viewing pleasure.
> 
> One thing I'd like to learn more about is how the "MDC" fail-over controller works, and also how to adjust the MXO backup crystal oscillator -- the "Adjust XTAL" indicator on mine is on the edge of being lit, but I haven't been able to find any way to trim the OCXO. The GPSDRb is working just fine, though.
> 
> John
> 
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