[time-nuts] RFTG-u REF 0 Z3812 as cleanup module for FEI5680A

Bob Camp kb8tq at n1k.org
Tue Nov 18 07:47:37 EST 2014


At this point there is no “proof” that the non-GPS REF-0 will run by it’s self. My guess is that it will operate on it’s own with faked GPS messages. 

Since the REF-0 has a 10 MHz output, there is less need to immediately change around the 15 MHz output. 

The power brick would be a bit complicated to remove. It’s a triple output unit.


> On Nov 18, 2014, at 12:08 AM, Hendrik Dietrich <don_hendi at gmx.de> wrote:
> 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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