[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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