[time-nuts] newcomer

SAIDJACK at aol.com SAIDJACK at aol.com
Mon Sep 15 20:11:00 EDT 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  
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.
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 :

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.



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