[time-nuts] Improving the stability of crystal oscillators

Brooke Clarke brooke at pacific.net
Thu Oct 11 15:58:38 EDT 2007

Hi Tom:

Very interesting.  How about  building a circuit to drive those GR crystals?

The same man is the inventor of all four of the early GR patents, James Kilton 
Clapp, of   "Clapp Oscillator" fame.
In the 1930s GR patents he's showing an inductor in series with the crystal and 
Wiki dates the "Clapp Oscillator" 1948 where a capacitor is in series.

Have Fun,

Brooke Clarke
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam

Tom Van Baak wrote:
> Maybe because it was written back in 1930's, but one of the better
> discussions of quartz temperature control, including considerations
> of insulation and isothermal layers (attenuation and conduction)
> are in the patents for the old double oven General Radio frequency
> standard:
> http://www.leapsecond.com/museum/gr676b-50kc/
> http://www.leapsecond.com/museum/gr676b-50kc/US1967185.pdf
> /tvb
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