[time-nuts] RFTG-u REF 0 Z3812 as cleanup module for FEI5680A
Hendrik Dietrich
don_hendi at gmx.de
Tue Nov 18 05:08:09 UTC 2014
Hello List,
having not looked at the spectra yet as I am confined to mobile phone
instead of PC often, I had the idea to marry those two well-known
devices to get a nice clean reference oscillator. I remember the
spectrum of the FEI as not so nice, and the MTI sounds better.
My understanding is yet that I would need to emulate the REF1 unit,
basically need to look up the "lonely REF" tweak with the bridges in J5,
maybe fake valid GPS datagrams with a microcontroller and turn the 1PPS
pulse from the FEI into that 2 PPSes expected.
Replacing the Lucent Power Brick with a linear supply and bridging the
tripler to get 5 MHz out might be tweaks to increase the output spectrum
further. This was discussed before, I think, i have to look it up too.
(I wonder if the REF0 acts up after complete removal of the source REF1
or keep on doing holdover which would be a nice way to take a good
frequency standard to a ham radio repeater side)
BR
Hendrik
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