[time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz

[Bob Camp]

Hi

What you probably will wind up with is a bit wider PLL bandwidth than 50 Hz.
The noise floor of your dividers and your phase detector will need to be
below that of the BVA. If you divide by 10, then the 20 log N works against
you in this case. Take a look at the phase noise numbers on the OCXO at 100
Hz offset to get an idea of just what you are up against.

Next up, the noise of the output VC(X)O will need to be below the multiplied
noise of the BVA at the cross over frequency. Here you get a benefit from 20
log N. You still will have a hard time beating the 10 MHz OCXO close in.
Phase noise data on both the VC(X)O and the BVA will come in very handy in
figuring things out. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Anders Time
Sent: Friday, July 01, 2011 7:34 AM
To: time-nuts at febo.com
Subject: [time-nuts] Generating a stable 26MHz and 19.2MHz from 10MHz

I want go generate a stable 26MHz and 19.2MHz signal with stability in
the 1E-13 range at 1s from my 10MHz BVA.
Have been thinking about dividing the signals down to 1MHz and 100kHz
and PLL (50Hz BW or so) a reasonable stable 26MHz and 19.2MHz OCXO to
that signal. But I'm worried that the division will generate noise so
it will not be stable enough?
Have also been thinking about using a DDS to the 26MHz and 19.2MHz and
then pll, but the DDS subject seems to bee very difficult to get a
grip on. Is it possible to generate a signal with that kind of
stability in the 1s range?
Thanks
Anders

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