[time-nuts] FE5680 GPS Disciplined Controller

Charles Steinmetz csteinmetz at yandex.com
Thu Jun 19 04:59:35 EDT 2014


Bill wrote:

>There are two types of FE5680's.  The older style used an ANALOG 
>approach to controlling the Rb.  The newer version changed the 
>circuitry so that frequency control was done with a DDS device by 
>means of sending a digital word to the DDS and thus changes 
>frequency.  The digital version does not permit any ANALOG control.

Instructions for determining which version one has would make it 
easier for potential users to decide if they want a 
controller.  Preferably, without opening it up or turning it on, if 
that is possible.  Can you tell by the label, for example?

Best regards,

Charles





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