A couple of weeks ago I noted that the complexity of DeMaw’s circuit caused many of us to wimp out on this test gear project. I joked that those who had built the device might be able to set up small businesses to do the testing for the rest of us. Perhaps our friend Dino can cut a deal with G7WKE to divide up the world market for crystal testing: Dino could have the Western Hemisphere while Rob covers Europe and points East.
Bill –
Enjoyed seeing someone else who has built Doug’s crystal tester on the blog. Here’s mine, built this back in early 2007. Anyone who wants to duplicate the tester can find the article in the January 1990 issue of QST or the updated article in the W1FB Design Notebook (page 192). Note that the QST article has a missing component value and a missing component (both corrected in the Design Notebook):
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Really nice work, Dino. 🙂