[time-nuts] GPS noise reduction

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Apr 6 00:02:29 EDT 2008

Bruce Griffiths wrote:
> Bruce Griffiths wrote:
>>> Bruce,
>>> Thanks for verifying that a common OCXO for the TIC clocks will work.
>>> I wasn't looking forward to downgrading to individual XOs.
> Richard
> That only works if either:
> 1) The TIC OCXO isnt locked to the GPS (or either of the oscillators 
> being disciplined).
> OR if the TIC OCXO is locked to the GPS:
> 2) The random GPS receiver PPS timing jitter (after sawtooth correction) 
> is greater than the TIC resolution (10ns).
> Bruce
Failing either of the above conditions requires that random phase noise 
modulation be added to the 100MHz OCXO output to ensure that the TIC 
measurements average correctly.


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