{"id":16786,"date":"2026-04-01T16:23:04","date_gmt":"2026-04-01T10:53:04","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16786"},"modified":"2026-04-01T16:23:06","modified_gmt":"2026-04-01T10:53:06","slug":"finally-easy-bitx-is-generating-rf-output","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/finally-easy-bitx-is-generating-rf-output\/","title":{"rendered":"Finally Easy BITX is generating RF output!"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/tSBYfnBCJqo?si=RtlhS_CTqkaJFdKj\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Straight calculation is 4V into 50\u03a9 = 0.32 W, provided, the RF probe is showing the accurate RF voltage! I am on the lookout for a 6V bulb with 50\u03a9 resistance, that should be around 0.72W. If I get one, I can see the brightness of the bulb without having an impedance mismatch to IRF510 final MOSFET of Easy BITX. Still there is a snag there. Usually it is the hot resistance of 50\u03a9, resistance may be lower when it is cool and starting impedance presented to IRF510 may be a mismatch! That was the way I used to check output and tune final circuit when I had homebrewed a VU2VWN QRP way back in 1985. I did lose quite a few BD139s in the final of VU2VWN QRP.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Straight calculation is 4V into 50\u03a9 = 0.32 W, provided, the RF probe is showing the accurate RF voltage! I am on the lookout for a 6V bulb with 50\u03a9 resistance, that should be around 0.72W. If I get one, I can see the brightness of the bulb without having an impedance mismatch to IRF510 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16790,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16786","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Finally Easy BITX is generating RF output! - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/finally-easy-bitx-is-generating-rf-output\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Finally Easy BITX is generating RF output! - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Straight calculation is 4V into 50\u03a9 = 0.32 W, provided, the RF probe is showing the accurate RF voltage! I am on the lookout for a 6V bulb with 50\u03a9 resistance, that should be around 0.72W. 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