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. -Chuck Harris 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. [] Alan G3NYK ================================ 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. 73, David GM8ARV
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