There hasn't been much discussion on the list about this idea. I know
that Timing Solutions (now Symmetricom) used to make -- or at least
advertise -- a "clean-up oscillator" that was a very low noise, very
high short-term stability BVA oscillator that would lock to your Cesium
reference. With a proper time constant (10s of kseconds?), that should
give the best of both worlds with superlative short term performance and
atomic long-term stability.
John
----
Luis Cupido wrote:
Hi Dick,
'cause it may not integrate long enough...
'cause it may have poor phase noise...
;-)
(it is however a very good question though, as one must
be really sure what it does and then be motivated to improve it...)
Luis Cupido
ct1dmk.
Richard W. Solomon wrote:
Dumb question time:
If the NavSync has an on-board synthesizer locked to GPS, why do
you need to lock that to another oscillator ??
73, Dick, W1KSZ
-----Original Message-----
From: gonzo moto <[email protected]>
Sent: Aug 7, 2009 1:32 AM
To: [email protected]
Subject: [time-nuts] PLL question
Hi Guys,
I'm in the process of building a GPSDO which started out life based
on G3RUH's design, but suffered a bit of feature creep.
The GPS I'm using is the NavSync CW12, so I'll run the Freq_Out at
10MHz.
I'm wondering if I should run the PLL at 10MHz or if there is an
advantage dividing the two signals down to (say)10KHz.
Does the averaging at 10kHz (and introduced errors of the dividers)
outweigh the 'no averaging' and no additional errors syncing at the
fundamental freq?
I can think of arguments each way, but lack the test equipment to
prove either way.
Suggestions would be appreciated.
Regards,
ian
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