[ARC5] Can Old Crystals Be Restored?

[Robert Eleazer]

Earlier this week I was trying to figure out if a couple of 1 MHZ crystals were working - one had worked and then the oscillation stopped after a couple of minutes.  With the other crystal the oscillator was dead.  

I wonder if anyone has a design for a crystal tester?  I was very impressed with the 2nd LO used in the National NC-270 when I converted a NC-155 to a crystal 2nd LO. I also was very impressed with the 7404 TTL crystal controlled oscillator I built back in the mid-70's. Both worked the first time. 

I am always impressed with things that work the first time for me. In contrast, Edison said he did not trust such devices.

I'd like to build a stand alone duplicate of the NC-270 2nd LO to use as a crystal tester and general purpose oscillator.  Has anyone done anything like that?

Thanks,

Wayne
WB5WSV   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20160611/f7952d50/attachment.html>