[time-nuts] RFTG-u REF 0 Z3812 as cleanup module for FEI5680A
EWKehren at aol.com
EWKehren at aol.com
Tue Nov 18 14:22:03 UTC 2014
I would not mess with the power management of the unit, HP did know what
they where doing. Any clean up I would move off the unit if you want to stay
with the same OCXO you have one in the second unit.
As to phase noise before time nuts issues took up all my time low noise
signal generators where my main focus and will be again. I know of no high
quality Sig. Gen that does not include a 100 MHz XO and in some cases higher
frequency SAW units. And that has been going on for as long as I can
remember and I am 72.
One subject no one has touched on is thermal control. I do not know but
suspect forced air cooling that would explain why all connectors on the front.
From comments by some members we are looking at 20 W. I will include a fan
along with temperature control.
Bert Kehren
In a message dated 11/18/2014 12:21:32 A.M. Eastern Standard Time,
don_hendi at gmx.de writes:
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
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list