[time-nuts] Strange oscillations

Brooke Clarke brooke at pacific.net
Sat Sep 4 19:15:12 EDT 2004

Hi Bill:

I did the gravity experiment on my PRS10 by monitoring the tuning 
voltage to the crystal (which is controlled by a loop driven from a 
Motorola GPS receiver.  The max change due to gravity acting in the 6 
different directions is about 750E-12.

Have Fun,

Brooke Clarke, N6GCE


Bill Hawkins wrote:

>So it looks like Alberto has a hysterical crystal in a nice,
>small package. The crystal easily meets the 10E-10 specification.
>Too bad, I was going to suggest gravity waves and ask if the
>magnitude of the oscillation changed with orientation of the
>unit's case. But I'm not an astrophysicist so I don't know
>the expected magnitude of the effect.
>The specs on the reference voltage are not that tight. Would
>the voltage reference junction have a tighter tempco than the
>crystal? One would think so.
>Anybody know the stability of the VP Oncore GPS?
>Does a phase-locked loop have hysteresis from some digital
>effect? Again, that seems unlikely.
>Alberto, what's your weather been like? Clear, windy, cloudy?
>Bill Hawkins
>time-nuts mailing list
>time-nuts at febo.com

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