Hi The technique still works fine. If you have looked at the auction prices on the old crystals … good grief …..
If you do drop one into a “modern” circuit, it’s worth noting that the crystal in an FT style holder has another capacitor in it when compared to the model of a modern (plated electrode) crystal. The air gap is the source of the element. Net result is that (without the toothpaste) they are a bit harder to tune. Bob > On Aug 24, 2015, at 1:49 PM, Don Latham <[email protected]> wrote: > > Gee whatever happened to slipping it out of the ol' FT holder and rubbing with > a little toothpaste? > <g> Don > > Bob Camp >> Hi >>> On Aug 23, 2015, at 10:29 PM, Hal Murray <[email protected]> wrote: >>> >>> >>> [email protected] said: >>>> There is not a lot to an un-compensated crystal oscillator. Tuning it on >>>> frequency is fairly simple. Even for odd frequencies Mouser will happily >>>> sell you a crystal for next to nothing. Toss in a handful of parts and you >>>> have a very respectable oscillator. For a basement project … much better >>>> than spending $40 on something suspect from who knows who. >>> >>> What's magic about a crystal as compared to an osc? Is it really easier to >>> get an odd-ball frequency in a crystal vs an osc? >> >> >> When I do a Mouser search for frequencies in the range I mentioned, the >> number >> of frequencies is pretty small. If I switch over to looking at crystals at >> Mouser, the >> frequency choices are a lot greater. Yes, as with the oscillators you need to >> sort out >> the ones that aren’t going to cut it. >> >> To your point - no, you can’t get anything / any frequency through >> distribution. That’s >> true both of oscillators and of crystals. You just more picks with the >> crystals. >> >> Bob >> >>> >>> The last time I bought a special frequency osc was over 10 years ago. Once >>> I >>> found the right company, things were simple. I don't remember the price. >>> At >>> the time, it seemed reasonable, but that was for a commercial project rather >>> than a basement lab. >>> >>> Do those companies still exist or have they all fallen through the cracks of >>> higher volumes and lower prices. >>> >>> >>> -- >>> These are my opinions. I hate spam. >>> >>> >>> >>> _______________________________________________ >>> 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. >> >> _______________________________________________ >> 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. >> >> > > > -- > "If you don't know what it is, > don't poke it." > Ghost in the Shell > ------------------------------- > "Noli sinere nothos te opprimere" > > Dr. Don Latham, AJ7LL > Six Mile Systems LLC, 17850 Six Mile Road > Huson, MT, 59846 > mailing address: POBox 404 > Frenchtown MT 59834-0404 > > VOX 406-626-4304 > CEL 406-241-5093 > Skype: buffler2 > www.lightningforensics.com > www.sixmilesystems.com > > > _______________________________________________ > 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. _______________________________________________ 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.
