{"id":693,"date":"2025-01-22T15:16:00","date_gmt":"2025-01-22T04:16:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2025\/01\/22\/no-bunching-up-it-is-possible-to-achieve-dial-linearity-and-stability-with-an-lc-vfo\/"},"modified":"2025-07-22T18:00:59","modified_gmt":"2025-07-22T08:00:59","slug":"no-bunching-up-it-is-possible-to-achieve-dial-linearity-and-stability-with-an-lc-vfo","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2025\/01\/22\/no-bunching-up-it-is-possible-to-achieve-dial-linearity-and-stability-with-an-lc-vfo\/","title":{"rendered":"No Bunching Up! It is Possible to Achieve Dial Linearity (and Stability) with an LC VFO"},"content":{"rendered":"
\"\"<\/a>
<\/a>One of the major complaints about LC VFOs is that they allegedly cause “non-linear tuning.” Essentially, this complaint claims that you will inevitably end up with your frequencies all “bunched up” at one end of the tuning range, with frequencies greatly “spread out” at the other end. BUT WE HAVE FOUND THAT THIS IS NOT NECESARILY TRUE. With a bit of careful design work, you can avoid the dreaded “bunching up.” I have used the calculator in Bob’s Electron Bunker<\/a> to DESIGN VFOs that do not “bunch up” the frequencies. <\/b><\/div>\n

<\/b><\/div>\n
Recently, Mike WU2D built a version of the Simple X Super receiver.<\/a> It has a VFO in the 5 – 6 MHz range. And guess what? There is NO bunching up of frequencies. As proof, I present the tuning dial that Mike made for his completed receiver. See above. Note the nice linear tuning. <\/b><\/div>\n

<\/b><\/div>\n
So you see, success in this area is possible — all it takes is some careful design work. <\/b><\/div>\n

<\/b><\/div>\n
Similar results are possible with the other major allegation about LC VFOs: That they are inherently and irreparbly unstable. Proponents of this theory would have you believe that only by the use of an Si5351 (or something similarly digital) is stability possible. Again, NOT TRUE! It is possible to make LC oscillators that are stable. All it takes is careful design and good construction practices. <\/b>

<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"

One of the major complaints about LC VFOs is that they allegedly cause “non-linear tuning.” Essentially, this complaint claims that you will inevitably end up with your frequencies all “bunched up” at one end of the tuning range, with frequencies greatly “spread out” at the other end. BUT WE HAVE FOUND THAT THIS IS NOT … Continue reading “No Bunching Up! It is Possible to Achieve Dial Linearity (and Stability) with an LC VFO”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":694,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[121,53],"tags":[],"class_list":["post-693","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-murphy-mike-wu2d","category-vfo"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/693","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=693"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/693\/revisions"}],"predecessor-version":[{"id":695,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/693\/revisions\/695"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/694"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}