Hi, I have a number of crystals either in glass, bakelite, ceramic or metal housings that I would like to get resonating . They are of three basic types. Square, or rectangular flat Round flat Bar square section Sizes range from 2-10cm or more in the longest face.
Some have frequency markings. ranging from IKHz 5MHz. Others have none. Some are of Military origin, probably radios and as they have markings I can probably find a schematic from the radios to see how to proceed. There may be dedicated testers still around. I am not so interested in this bunch at the moment. Others have no known origin so I have no idea what oscillator circuits were used with them. In terms of vintage, I would guess pre 1940 to late 50s I have built a little Pierce circuit an tried a few. Some of the later 1-5MHz crystals will oscillate but there are a lot of parasitic signals as well as the supposed fundamental. I cannot make any of the low frequency / big crystals to react. So my question: If you had a crystal with unknown frequency and drive requirements that you wanted to investigate. How would you go about it? If I can get them going I will share the Adevs. I don’t have a spectrum analyser so I can’t do phase noise. Regards "The power of accurate observation is commonly called cynicism by those who have not got it. » George Bernard Shaw _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
