{"id":9535,"date":"2022-01-10T20:23:00","date_gmt":"2022-01-10T09:23:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2022\/01\/10\/exorcism-not-quite-complete-thinking-of-other-options\/"},"modified":"2025-07-22T18:04:03","modified_gmt":"2025-07-22T08:04:03","slug":"exorcism-not-quite-complete-thinking-of-other-options","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2022\/01\/10\/exorcism-not-quite-complete-thinking-of-other-options\/","title":{"rendered":"Exorcism Not Quite Complete — Thinking of Other Options"},"content":{"rendered":"<\/p>\n
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As often happens, I may have jumped the gun in declaring the exorcism of my 17 meter transmitter to be a success. As readers of this blog will recall, my problem was that when trying to “net” my separate 17 MHz receiver and transmitter, at around 18.116 MHz I could hear more than one tone as I tried to get to zero beat. The 8th harmonic of my 5.176 MHz carrier oscillator was mixing with the 23 MHz VXO signal and producing a spur. I could probably knock the level of this spur down below FCC limits, but — and here is the problem — I probably could never knock it down to the point that it would not be audible in the sensitive receiver that sits right next to the transmitter. So this is really a netting problem, not really a spur problem. <\/p>\n

I don’t want to try another filter frequency — I have VXO crystals that really work only with a filter at 5.176 MHz.<\/p>\n

So here is my current idea: Build a receiver board and turn this thing into a transceiver. Switch with relays the input and output of the 5.176 MHz filter, and use relays to switch to the receiver board the VXO and carrier oscillator signals. <\/p>\n

Making this thing a transceiver would eliminate the need for netting. This should solve my problem. <\/p>\n

What do you folks think? <\/p>\n

73 Bill <\/p>\n","protected":false},"excerpt":{"rendered":"

As often happens, I may have jumped the gun in declaring the exorcism of my 17 meter transmitter to be a success. As readers of this blog will recall, my problem was that when trying to “net” my separate 17 MHz receiver and transmitter, at around 18.116 MHz I could hear more than one tone … Continue reading “Exorcism Not Quite Complete — Thinking of Other Options”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":2900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44,16,23,380,25],"tags":[],"class_list":["post-9535","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-17-meters","category-filters","category-ssb","category-swan-240","category-troubleshooting"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9535","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=9535"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9535\/revisions"}],"predecessor-version":[{"id":9536,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/9535\/revisions\/9536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/2900"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=9535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=9535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=9535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}