{"id":450,"date":"2014-01-11T18:13:54","date_gmt":"2014-01-11T17:13:54","guid":{"rendered":"http:\/\/www.pa3hcm.nl\/?p=450"},"modified":"2021-01-18T17:24:26","modified_gmt":"2021-01-18T16:24:26","slug":"hb9cv-antenna-for-23cm","status":"publish","type":"post","link":"https:\/\/www.pa3hcm.nl\/?p=450","title":{"rendered":"HB9CV-in-a-box antenna for 23cm"},"content":{"rendered":"\n<div class=\"wp-block-image\"><figure class=\"alignright\"><a href=\"http:\/\/www.pa3hcm.nl\/?attachment_id=482#main\" rel=\"attachment wp-att-482\"><img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"300\" src=\"http:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837-225x300.jpg\" alt=\"The antenna is mounted in my pole, just below the 23cm LNC. Both are pointing at the PI6ATV repeater.\" class=\"wp-image-482\" srcset=\"https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837-225x300.jpg 225w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837-768x1024.jpg 768w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837.jpg 1920w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><figcaption>The antenna mounted in my pole, just below the 3cm LNC. Both are pointing at the PI6ATV repeater.<\/figcaption><\/figure><\/div>\n\n\n\n<p>The HB9CV has been a popular antenna for decades, especially on the 2m band where it is commonly used for direction finding (foxhunt). Others create arrays of HB9CV antennas for DXing. Since I needed a simple antenna for 23cm (to uplink to the local ATV repeater PI6ATV) I thought it would be nice to use this HB9CV design.<\/p>\n\n\n\n<p>There are several designs available, I used a description of <a href=\"http:\/\/dh2pa.darc.de\/hb9cv.html\" target=\"_blank\" rel=\"noopener noreferrer\">DH2PA<\/a> for no particular reason (it was simply one of the first usable designs I found). If you don&#8217;t want to build it yourself, you can buy one on some radio stores or a local radio market.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Some specifications of the HB9CV antenna (according to &#8220;Rothammels Antennenbuch&#8221;):<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Gain: 4.2 dBd (+\/- 0.2)<\/li><li>3dB angle (E plane): 68 degrees<\/li><li>3dB angle (H plane): 130 degrees<\/li><li>Front-to-back ratio: 20 dB<\/li><li>Impedance: 50 ohm<\/li><\/ul>\n\n\n\n<p>I used thick copper wire to build the antenna itself, and thin copper wire to create the match\/feeder. Everything is simply soldered together. I used to build antennas for HF and VHF, so with these small dimensions I continuously thought I was building some model. The capacitor has a range of 2-6 pF and is used to match the antenna impendance.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"http:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/hb9cv-23cm-construction.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"332\" src=\"http:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/hb9cv-23cm-construction-1024x332.png\" alt=\"\" class=\"wp-image-1677\" srcset=\"https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/hb9cv-23cm-construction-1024x332.png 1024w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/hb9cv-23cm-construction-300x97.png 300w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/hb9cv-23cm-construction-768x249.png 768w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/hb9cv-23cm-construction.png 1162w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption>Antenna measurements (picture by DH2PA, adapted from the PDF-document mentioned above)<\/figcaption><\/figure><\/div>\n\n\n\n<p>The antenna is a bit vulnerable to weather conditions and other external influences, so I put it into a plastic box. If you want to do this, remember that the box must be &#8220;RF friendly&#8221;. If you&#8217;re not sure, put the box into your microwave for 2 minutes along with a glass of water, the box should remain cold. The antenna itself is fixed by using a small piece of semi-rigid, connected to the HB9CV at one side, and a N flange jack at the other side which is mounted through a hole in the box.<\/p>\n\n\n\n<p>After a final test the box is mounted to one of my antenna poles, close to the LNC which I use to receive the 3cm output of the ATV repeater.<\/p>\n\n\n\n<p>Down here you&#8217;ll see some pictures which show you how I made this antenna.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img data-id=\"463\" class=\"wp-image-463\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"465\" class=\"wp-image-465\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"464\" class=\"wp-image-464\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"466\" class=\"wp-image-466\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"467\" class=\"wp-image-467\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"468\" class=\"wp-image-468\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"469\" class=\"wp-image-469\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"471\" class=\"wp-image-471\"\/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"2560\" src=\"https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837.jpg\" alt=\"[image]\" data-id=\"482\" class=\"wp-image-482\" srcset=\"https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837.jpg 1920w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837-225x300.jpg 225w, https:\/\/www.pa3hcm.nl\/wp-content\/uploads\/2014\/01\/20140112_112049-e1389524173837-768x1024.jpg 768w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img data-id=\"481\" class=\"wp-image-481\"\/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>This article was also published in:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"http:\/\/downloads.dkars.nl\/DKARS%20magazine%20201410.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">DKARS Magazine, October 2014<\/a><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The HB9CV has been a popular antenna for decades, especially on the 2m band where it is commonly used for direction finding (foxhunt). Others create arrays of HB9CV antennas for DXing. Since I needed a simple antenna for 23cm (to uplink to the local ATV repeater PI6ATV) I thought it would be nice to use [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":482,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,24],"tags":[59,34,32],"class_list":["post-450","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-antennas","category-atv","tag-23cm","tag-antenna","tag-yagi"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/450","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=450"}],"version-history":[{"count":18,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/450\/revisions"}],"predecessor-version":[{"id":1910,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/450\/revisions\/1910"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/media\/482"}],"wp:attachment":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}