Technical Topics > The RF Workbench

which type of crystal

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redhat:
The last time I built something with one was several years ago.  I build a device that had a 3 MHz oscillator in it, and divided it down to 300 Hz.  That was compared to a pulse generator on the gear train of a machine that at the proper speed would also provide 300 Hz.  The error voltage produced by the phase comparator was filtered and fed to a VFD to keep the machine at the right speed.  It took some design and breadboarding time, but its still working :)

+-RH

OMCS:
I agree that some kind of vfo is the way to go, however, if you come across an old rig with the crystal plugs it's much easier sometimes to just buy one and pop it in. Used to work for a guy in the 90's who had a box full of the old style crystals, (brown bakelite square thingys) mostly ham bands but he also had some bizarre frequencies in there as well. Wish I had bought the lot off of him.

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