[time-nuts] newcomer
SAIDJACK at aol.com
SAIDJACK at aol.com
Tue Sep 16 00:11:00 UTC 2014
Hi Stephane,
our customer just needed +/-50KHz free-running over all conditions
including aging, so stability was not of major concern, and the unit easily
performs significantly better than that. We did make a VCO version for PLL
disciplining so you can lock it to a GPSDO or in a correlated phase noise test
system etc. The stability is thus not really good, but sufficient for Radar
applications.
The technology is a Crystal oscillator multiplied by 5x internally I think
(maybe it was 3x, can't remember), then by 2x externally. Since it is a
MilSpec compliant part it is not that low-cost, but it is lower-cost and much
higher-performance than the legacy part it replaces. More than $1K for sure
though. It also has some additional tricks up its sleeve such as a
built-in DC-DC switcher and power supply filter allowing operation from +6V to
+15V without affecting output power, and allowing noisy external power
supplies to be used, and harmonics lower than -32dBc typically by using the steep
ceramic low-pass filters.
That Abracom part looks pretty nice too, and your approach should work well
too if you can get the 5x multiplier working well. Get a good 10MHz OCXO
and use an AD PLL chip such as ADF4002 etc to lock that Abracom part with a
pretty small loop BW (<100Hz), and you will have the best of both worlds.
Bye,
Said
In a message dated 9/15/2014 16:52:18 Pacific Daylight Time,
steph.rey at wanadoo.fr writes:
Thanks for the details.
This miniaturized device is nice.
There is no information regarding stability. Anything there ? What's the
technology inside ? crystal, TCXO ?
What is the approx price for a such device ?
The VCXO I was targetting is this one :
http://www.abracon.com/Precisiontiming/ABLNO.pdf
This should bring more or less the same level of PN once multiplied than
your ULN_1G.
However the frequency accuracy is poor and it needs to be disciplined in
most applications.
Cheers
Stephane
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