[time-nuts] Designing and building an OCXO and GPSDO

[Bruce Griffiths]

SAIDJACK at aol.com wrote:
>    Thanks Bruce,
>
>
>
>    it would be interesting to see how the different topologies affect
>    phase noise and stability etc, and what kind of performance can be
>    achieved.
>
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>
>    bye,
>
>    Said
>
>
>   
Said

One way to evaluate the merits of various oscillator circuits would be 
to build an example of each and then measure their phase noise and ADEV.

To keep the number of variables and costs down all oscillators should 
use the same 10MHz fundamental crystal.
The oscillators should not be enclosed in their own oven, however an 
enclosure with a long thermal time constant can be used.
The oscillator output should be +7dBm into 50 ohms.
No EFC and probably no trimmer cap (however this requires that a 
TSC5120A or similar be used to measure the ADEVand phase noise).
Power supply should be standardised at +12V.


Bruce