{"id":2508,"date":"2017-11-25T22:33:00","date_gmt":"2017-11-25T11:33:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2017\/11\/25\/polyvaricon-variations-polyvaricons-are-not-all-the-same\/"},"modified":"2025-07-21T13:24:42","modified_gmt":"2025-07-21T03:24:42","slug":"polyvaricon-variations-polyvaricons-are-not-all-the-same","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2017\/11\/25\/polyvaricon-variations-polyvaricons-are-not-all-the-same\/","title":{"rendered":"Polyvaricon Variations — Polyvaricons Are Not all The Same"},"content":{"rendered":"
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<\/b> When I built the first prototype of the iPhone DC receiver, I just reached into my junk box and used a polyvaricon capacitor for the main tuning control. It was marked PL 051. I was really pleasantly suprised at the stability of the Variable Ceramic Oscillator circuit. I could tune the entire 40 meter band with complete stability — Juliano levels of stability. <\/b> <\/p>\n


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By the time I put the second version into its box (see above), I used a different polyvaricon (the one pictured below). It worked, but with this part the receiver drifted noticeably. So this morning I pulled it out and put in a second PL 051 Polyvaricon. Viola! Eccolo! Success. Drift eliminated. Rock stable. <\/b>

<\/b> Has anyone else noticed variations like this in the stabilty of polyvaricons? <\/b>

<\/b> The dial in this version is an Archer device that has been kicking around in my junkbox for more than 20 years. I think it was given to me by my old friend Pericles HI8P — this adds a tremendous amount of soul to this new machine). The box is an old Bud aluminum chassis. Man, this thing sounds great. I will try to post a video soon. <\/b><\/p>\n

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When I built the first prototype of the iPhone DC receiver, I just reached into my junk box and used a polyvaricon capacitor for the main tuning control. It was marked PL 051. I was really pleasantly suprised at the stability of the Variable Ceramic Oscillator circuit. I could tune the entire 40 meter band … Continue reading “Polyvaricon Variations — Polyvaricons Are Not all The Same”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":2509,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,93,35],"tags":[],"class_list":["post-2508","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-40-meters","category-ceramic-resonators","category-direct-conversion"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2508","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=2508"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2508\/revisions"}],"predecessor-version":[{"id":2511,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2508\/revisions\/2511"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/2509"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=2508"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=2508"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=2508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}