[time-nuts] PLL question

[John Ackermann N8UR]

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 <cadbloke at hotmail.com>
>>> Sent: Aug 7, 2009 1:32 AM
>>> To: time-nuts at febo.com
>>> 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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