Hacking Together a Crystal Oven Part 2
382 words | Posted on August 27th, 2010
Scott was 24.92 years old when he wrote this!
Filed under: Circuitry, General, Radio
With the last post’s promising results, I set out to finish my crystal oven prototype and affix it to my QRSS MEPT prototype. If everything works well, I’m ready to publish the final schematic and parts lists! (and make several MEPTs for people who were interested in having one). I’m not confident my approach to the heater was the best, and am already thinking of ways I could have improved on its performance, but I think this just might work! I’ll test it overnight (styrofoam-enclosed vs. open air) and see how it does. I wonder if this is good enough to be used outside?
Here’s the device attached to the transmitter 
here are some closeups 
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3 Responses to “Hacking Together a Crystal Oven Part 2”
| Eldon R. Brown SR wrote the following at 12:54:58 AM on August 28th, 2010 |
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Scott, I think you will want to characterize your crystals over a heat cycle, as most have multiple “S” curves at varying temp. You will want to configure your oven for a flat spot on the curve. Eldon – WA0UWH |
| jammit wrote the following at 02:44:36 PM on September 28th, 2010 |
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I think you may want to look at this guys stuff: |
| Don Hartley wrote the following at 10:37:31 AM on October 24th, 2010 |
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Peter G. Sulzer of NBS (now NIST) , on loan to JK Crystal Co., Sandwich, IL in 1956-7 built the first propor-tional control oven. That is what you have re-invented. It had large tubes in it (6080s or similar). The next version was solid state, of which there were two. They were accurate to +/-one second in 300 years. After being put on the exact same frequency, one stayed at the plant, and the other one went with Pete on an airliner around the world (which direction I do not recall). When he came back with it, the frequency difference was just as calculated, proving Einstein’s theory. I was there; I knew everyone involved and built some of the apparatus and circuitry used. Don Hartley (google Ralph VL Hartley, if you wish). |
