[time-nuts] FE 5650A Question

[EWKehren at aol.com]

There are many versions of the FE 5650A just like the FE 5680.  Recently we 
got a few FE 5650A option CPOM that internally are fairly  similar to a FE 
5680A. It also uses an AD9832A  DDS and is 15 MHz but by  changing 3 jumpers 
divides the 60 MHz by 6 instead of 4. Output is a nice  sinewave. Control 
is TTL not RS level. But protocol seems identical and as you  can see in the 
attached are able to change frequency.  It is also obvious that the AD9832A 
is in the loop because if you  increase or decrease the tuning word 
excessively the Rb goes out of lock  just like the FE 5680A. C field tuning is not 
brought out . The FE 5680 looks  like a costreduction version of this 5650A 
going from five PC boards to one.  What is different how ever is the 
magnitude of the tuning word attached is a  comparison of the 5680 and this 5650 
tuning word five orders of magnitude and I  am convinced that there is no more 
resolution than with the 5680.
Does any one have any information on this particular  unit?
Bert Kehren  Miami
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