[time-nuts] newcomer

Stéphane Rey steph.rey at wanadoo.fr
Mon Sep 15 20:47:16 EDT 2014

Thanks for your feedback. This is indeed a bit expensive for that application.
The x5 multiplier is indeed just the harmonic 5 capture with the helical filter. I'll let you know the outcome. This probably won't beat any expensive ULN source but might be a good starting point for low cost. Worth to try


-----Message d'origine-----
De : time-nuts [mailto:time-nuts-bounces at febo.com] De la part de S. Jackson via time-nuts
Envoyé : mardi 16 septembre 2014 02:11
À : time-nuts at febo.com
Objet : Re: [time-nuts] newcomer

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.
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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