[time-nuts] Home made GPS disciplined atomic clock

John Ackermann N8UR jra at febo.com
Wed Jan 28 13:17:17 UTC 2009


Except at very short tau (measurement interval), the Wenzel oscillator 
ADEV (at least the Ultra Low Noise versions) is nothing to write home 
about compared to something like a surplus 10811A.  Designing for 
absolute phase noise isn't necessarily consistent with designing for 
longer term stability.

John
----

EWKehren at aol.com said the following on 01/28/2009 06:30 AM:
> Esa,  the answer to your problem is, as I said before, to clean up the  
> signal, use a high quality oscillator locked to your system with a PLL that  has 
> the appropriate time constant. The time constant will smooth out the jumps  you 
> see right now. The question is only which oscillator. A Wenzel was suggested  
> but in my opinion it is not what you need. I have used a Wenzel because I 
> wanted  the low phase noise when multiplied to 10 Ghz. You would pay for something 
> you  do not need. I have not seen Allan variance data on them. There are 
> plenty of  oscillators out there at a reasonable price starting with the HP 10544. 
> Yes, the  10544 will clean up your present setup and will be at least a 10X 
> improvement  over the LPRO solution. But the most widely available unit is the 
> HP 10811 which  will do a great job. Depending on how much you want to spend 
> the FTS 1200, 1000  or 2000 are an option. 
> Bert  WB5MZJ
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