{"id":1152,"date":"2017-07-01T10:53:00","date_gmt":"2017-07-01T00:53:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2017\/07\/01\/g7wkes-crystal-tester\/"},"modified":"2025-07-21T10:59:15","modified_gmt":"2025-07-21T00:59:15","slug":"g7wkes-crystal-tester","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2017\/07\/01\/g7wkes-crystal-tester\/","title":{"rendered":"G7WKE’s Crystal Tester"},"content":{"rendered":"
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Wow, this is an example of dedication to the cause. I think many of us wimped out when confronted with the complex circuitry of the test device prescribed by DeMaw, but Rob G7WKE actually built the thing, and did a great job on it. I’m tempted to suggest that Rob might want to set up a small business leasing this rig out to less dedicated filter builders. Or perhaps he could have batches of crystals sent to him for DeMaw-ian analysis.<\/b><\/i> <\/p>\n

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Hi Bill,<\/b><\/div>\n
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After listening to you and Pete discussing crystal filter design during SolderSmoke 197, I thought you might be interested in my latest project.<\/b><\/div>\n

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This is the Crystal Tester from January 1990 QST that is reprinted in W1FB’s Design Notebook, which I believe is the circuit you and Pete were referring to.<\/b><\/div>\n

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It all appears to function as it should, so the next step is to sit down quietly with a pile of crystals and hopefully start along the road to a working filter!<\/b><\/div>\n

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73s<\/b><\/div>\n
Rob G7WKE.<\/b><\/div>\n

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Wow, this is an example of dedication to the cause. I think many of us wimped out when confronted with the complex circuitry of the test device prescribed by DeMaw, but Rob G7WKE actually built the thing, and did a great job on it. I’m tempted to suggest that Rob might want to set up … Continue reading “G7WKE’s Crystal Tester”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1153,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,16,71,119],"tags":[],"class_list":["post-1152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-demaw-doug","category-filters","category-test-gear","category-uk"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=1152"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1152\/revisions"}],"predecessor-version":[{"id":1155,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/1152\/revisions\/1155"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/1153"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=1152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=1152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=1152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}