[time-nuts] Mechanical 1PPS Oscillator Disciplining
cfharris at erols.com
Sat Jan 10 08:56:09 EST 2015
Similarly, the Tektronix 647 oscilloscope, uses a 4KHz
quartz crystal oscillator, divided by 4 to form its
1KHz calibrator signal. You can hear the crystal
resonate whenever the calibrator is turned on.
The crystal is mounted in an elongated, hermetically
sealed, HC7 style can.
David J Taylor wrote:
> Hi Tom dividing down wasn't always necessary I have sample from the UK GPO
> Crystal Factory of NT-cut bars, quartz tuning fork, and Gapped Ring
> crystals, the latter marked 400cps (pre Hertz :-)) ) I think these are
> post WWII because they are mounted in IO base GT style tube envelopes.
> Dividers were achieved with neons and locked multivibrators, where
> necessary, I believe.
> I have one "500 c/s" GEC crystal in an octal base which is thinner than a "60 Kc/s"
> one, so a different mode. Never had it working, though.
> David GM8ARV
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