[time-nuts] FE 5650A Question

[EWKehren at aol.com]

Brooke
Thanks for the info. At least now I know where they came from also the two  
patents you mention are the basis for the FE 405 with minor changes. A very 
nice  unit with great performance.
Bert Kehren
 
 
In a message dated 12/27/2013 2:31:38 P.M. Eastern Standard Time,  
brooke at pacific.net writes:

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

EWKehren at aol.com  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
>
>
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