[time-nuts] Motorola M12+T - On board oscillator phase noise specand/or part number

John Ackermann N8UR jra at febo.com
Thu Jan 8 15:20:01 UTC 2009


Stephan Sandenbergh wrote:
> Hi Tom,
> 
> Thanks - the data is rather useful. Do you perhaps know what the high freq
> phase noise looks like?  I'd like to lock the GPS LO to the output of my
> GPSDO. However, the integrated jitter will probably determine if it could be
> done, by something as simple as filtering the output of a fractional N
> (implemented inside a FPGA) or maybe a dedicated fractional N IC with
> low-noise VCO (such as those from Analog Devices). I guess the latter is
> more realistic.
> 
> I'd guess the stock TCXO onboard the M12+T would have a noise floor below
> say -140dBc/Hz.

I have a plot that shows the phase noise of two Tbolts and two Z3801As 
at http://www.febo.com/pages/gpsdo_comparison/ -- scroll down the page a 
bit to find the phase noise info.

John




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