[time-nuts] Making a HP 10811 better

Brooke Clarke brooke at pacific.net
Mon Mar 29 21:05:34 UTC 2010


Hi Tom:

Here's a 2g (turnover) plot for the PRS10 Rb source:
http://www.prc68.com/I/PRS10.shtml#Accel

Have Fun,

Brooke Clarke
http://www.PRC68.com


Tom Van Baak wrote:
>> Now if you really want some fun connect your OCXO to a
>> one meter cable and let it swing like a pendulum clock. You
>> should see some very nice sinusoidal FM as it goes back
>> and forth. Devise some sort of mechanical, compressed air,
>> or magnetic impulse system to keep it running like that all day.
>>
>> /tvb
>
> It works! http://www.leapsecond.com/pages/10811-g/
>
> Bob, it would seem the frequency shifts in this swinging
> 10811 oscillator are all acceleration related and not due
> to internal temperature variations, right? I could imagine
> there are (longer time constant) thermal effects for a full
> 2g turn-over, but not with this short ~1 Hz period.
>
> In fact you can see a slight, probably temperature gradient
> related, frequency drift after a full 2g turn (I waited about
> 5 minutes after each turn):
>
> http://www.leapsecond.com/pages/ocxo-2g/TBolt-2g-6axis.gif
>
> /tvb
>
>
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