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
Stephane -----Message d'origine----- De : time-nuts [mailto:[email protected]] De la part de S. Jackson via time-nuts Envoyé : mardi 16 septembre 2014 02:11 À : [email protected] 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. Bye, Said In a message dated 9/15/2014 16:52:18 Pacific Daylight Time, [email protected] 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. --- Ce courrier électronique ne contient aucun virus ou logiciel malveillant parce que la protection avast! Antivirus est active. http://www.avast.com _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
