{"id":3270,"date":"2022-05-17T18:17:00","date_gmt":"2022-05-17T08:17:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2022\/05\/17\/troubleshooting-and-fixing-old-faults-in-my-long-suffering-hammarlund-hq-100-part-2-video\/"},"modified":"2025-07-22T18:03:30","modified_gmt":"2025-07-22T08:03:30","slug":"troubleshooting-and-fixing-old-faults-in-my-long-suffering-hammarlund-hq-100-part-2-video","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2022\/05\/17\/troubleshooting-and-fixing-old-faults-in-my-long-suffering-hammarlund-hq-100-part-2-video\/","title":{"rendered":"Troubleshooting and Fixing Old Faults in my Long-Suffering Hammarlund HQ-100 (Part 2)  (video)"},"content":{"rendered":"<p><iframe loading=\"lazy\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\" frameborder=\"0\" height=\"247\" src=\"https:\/\/www.youtube.com\/embed\/MGxhRD5jNUU?rel=0\" title=\"YouTube video player\" width=\"440\"><\/iframe><\/p>\n<div><\/div>\n<div><span style=\"background-color: #f9f9f9; color: #030303; font-family: Roboto, Arial, sans-serif; font-size: 14px; white-space: pre-wrap;\"><b>Work continues on my old Hammarlund HQ-100. I give background on the rig and explain the electrical trauma it likely suffered. Following Dave K8WPE&#8217;s dictum that we can still learn a lot from old receivers, I dug into this one. I wanted to fix a long-standing S-Meter\/AVC problem. This led me to an interesting troubleshoot, with at least one &#8220;waste of time&#8221; detour. Eventually I found the fault in one of the coils in the grid circuit of the RF amplifier. The coils had been smoked years ago, perhaps by a lightning strike. I came perilously close to permanently losing 10-30 MHz. But I figured out how to fix the smoked coil. So my S-Meter\/AVC problem was fixed. I really like listening to this thing. There is still a lot of nice material on the SW bands. There are some very nice broadcasts in Spanish. Please subscribe to my YouTube channel. <\/b><\/span><\/div>\n<div><span style=\"color: #030303; font-family: Roboto, Arial, sans-serif;\"><span style=\"font-size: 14px; white-space: pre-wrap;\"><b><br \/><\/b><\/span><\/span><\/div>\n<div><span style=\"color: #030303; font-family: Roboto, Arial, sans-serif;\"><span style=\"font-size: 14px; white-space: pre-wrap;\"><\/p>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2022\/05\/HQ-1002010-3020MHz20Coil20BURNED.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" data-original-height=\"4032\" data-original-width=\"3024\" height=\"400\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2022\/05\/HQ-1002010-3020MHz20Coil20BURNED.jpg\" width=\"300\" \/><\/a><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><b>You can see where the coil burned. Wire remained intact, but the insulation burned creating a Primary to Secondary connection. <\/b><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><a href=\"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEg2cIGw5GpIc9EKob5Th3s4826eFa5guvbICVTBh0deP1xR9FQhPUfsfo24dUFDwZ7xkxJ37F3f1kKIBjBlvLRP1uQn8E7cLN7AYu_rqmd90XnFFZ9GPiSQg6CA03vRBVLCNIO9qutek2f0Hx-WleyIeLJcBmSn71ehX8G8ujcto2ru7pVsVbmqMNs2\/s4032\/HQ-100%2010-30%20MHz%20coil%20repaired.JPG\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" data-original-height=\"4032\" data-original-width=\"3024\" height=\"400\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2022\/05\/HQ-1002010-3020MHz20coil20repaired-1.jpg\" width=\"300\" \/><\/a><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><b>I just very carefully lifted one of the coils way from the other, eliminating the unwanted connection. <\/b><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2022\/05\/HQ-10020Homebrew20Z2.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" data-original-height=\"4032\" data-original-width=\"3024\" height=\"400\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2022\/05\/HQ-10020Homebrew20Z2.jpg\" width=\"300\" \/><\/a><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><b>Here&#8217;s my homebrew &#8220;RC Printed Network&#8221; Z2 module. This was unnecessary &#8212; the original was good. I put the original back in. <\/b><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"><b><br \/><\/b><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><b><br \/><\/b><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><b>Electric Radio magazine recently ran a two part series on the HQ-100. I have ordered these issues of the magazine. <\/b><\/div>\n<p><\/span><\/span><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Work continues on my old Hammarlund HQ-100. I give background on the rig and explain the electrical trauma it likely suffered. Following Dave K8WPE&#8217;s dictum that we can still learn a lot from old receivers, I dug into this one. I wanted to fix a long-standing S-Meter\/AVC problem. This led me to an interesting troubleshoot, &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2022\/05\/17\/troubleshooting-and-fixing-old-faults-in-my-long-suffering-hammarlund-hq-100-part-2-video\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Troubleshooting and Fixing Old Faults in my Long-Suffering Hammarlund HQ-100 (Part 2)  (video)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,176,178,25,101],"tags":[],"class_list":["post-3270","post","type-post","status-publish","format-standard","hentry","category-dominican-republic","category-hammarlund","category-hq-100","category-troubleshooting","category-tubes"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3270","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=3270"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3270\/revisions"}],"predecessor-version":[{"id":3275,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3270\/revisions\/3275"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=3270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=3270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=3270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}