[time-nuts] Adjusting HP 5065A frequency

[Edgardo Molina]

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.

Regards,




Edgardo Molina
Dirección IPTEL

www.iptel.net.mx

T : 55 55 55202444
M : 04455 20501854

Piensa en Bits SA de CV



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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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