[time-nuts] OCXO sensitive to gravity

[SAIDJACK at aol.com]

Hi Rick,
 
wonder if the operators needed their hearing calibrated after long  
exposures to that :)
 
A long time ago I designed and built a 1KHz ultra-low-distortion signal  
generator using the original H/P design (Wien bridge(?) with a small lamp for  
amplitude stability).
 
That lamp is a great seismic sensor.
 
bye,
Said
 
 
In a message dated 8/15/2009 13:19:28 Pacific Daylight Time,  
richard at karlquist.com writes:

A well  used trick with the HP608 signal generator, which did not
have frequency  modulation, was to mount a speaker on the side
of the case and drive it  with 1 kHz to generate FM using
microphonics.  It supposedly worked  quite well and could even
be calibrated.

Rick Karlquist  N6RK