[time-nuts] Adjusting HP 5065A frequency

Edgardo Molina xe1xus at amsat.org
Sun Oct 21 11:11:58 EDT 2012

Dear Corby,

Good morning. Thank you for the detailed instructions to bring the 5065A close to desired frequency. I couldn't have a cleaner explanation of the process. 

Yesterday evening I tried adjusting the C field in small steps using a mixer, lpf and two oscillators setup as my current frequency counter is not able to resolve de small increments/decrements of frequency adjustment. Still I could detect the adjustments as I performed them. The response is quite fast. I have been told that these units are really stable compared to the small telecom Rb units. I heard a comment that the 5065A is even more stable than the new Symmetricom units using the X72 Rb module. Have you ever measured such differences in stability?

Thank you.


Edgardo Molina
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On Oct 19, 2012, at 5:55 PM, cdelect at juno.com wrote:

> Edgardo,
> You do use the C-field adjust to put a 5065A "On frequency". The Factory
> values are a moot point after all these years!
> Just incrementaly adjust the c-field control in small steps while
> observing the frequency comparison. 
> The only thing that might happen is that you reach one end of the C-field
> pot before getting to the frequency you want.
> If that is the case you will need to set the synthesizer switch to the
> next value in the chart. (either up or down depending on which way you
> ran out of room.)
> Then start over with the c=field adjustment.
> If you switch the synthesizer setting you will need to remove power
> momentarily to reset the synthesizers lock indication circuit. Otherwise
> pushing the logic reset button to get the green light wont work.
> Corby
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