[time-nuts] FE5680 GPS Disciplined Controller

[Peter Bell]

I can't claim it's 100%, but all the ones I've seen that had the FEI logo
and the address silk-screened onto the metal case and a single adhesive
label with the serial number have been the old ones.  The new units have
two adhesive labels and no screen printing.  Note that this only seems to
work for the FE-5680A - I have also seen a FE-5680B that had the new type
electronics and was screen printed.

Has anyone on the list got one that doesn't follow this rule?

Regards,

Pete



On Thu, Jun 19, 2014 at 4:59 PM, Charles Steinmetz <csteinmetz at yandex.com>
wrote:

> 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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