Hi Bert: I have a little info on FEI units, including some links to their patents, at: http://www.prc68.com/I/FEIFS.shtml
The two patents with the title "Precision oven-controlled crystal oscillator" are about using a crystal that's not precision ground, i.e. it's near the desired frequency, but not good enough to use it's output directly, and then using a DDS to translate the frequency to a desired output. The number 15 Mhz appears in both of them.
The two titled "Multimode crystal oscillator" are about an oscillator that has an extra output to allow seeing the effect of temperature.
Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html [email protected] wrote:
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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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