[time-nuts] GPSDO control loops and correcting quantization error

Bob Camp lists at rtty.us
Sat Sep 15 02:03:07 UTC 2012


Hi

Very few VCXO's have reference outputs. Some OCXO's have reference outputs. The gotcha there is the oven current. You can easily get multiple mV sort of changes in the  OCXO ground voltage as the oven current cycles over a fairly narrow range. That significantly impacts the usefulness of the reference, since they share a common ground.

Bob

On Sep 14, 2012, at 6:10 PM, Don Oconnor <eGunk at wowway.com> wrote:

> Hello all, 
> 
> 
> 
> Most voltage controlled XOs have a voltage reference output. Is it necessary for the DAC output / frequency control input, to track this voltage reference output?
> 
> 
> 
> Thank You
> 
> 
> 
> Don O'Connor
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