{"id":996,"date":"2014-04-13T18:03:47","date_gmt":"2014-04-13T18:03:47","guid":{"rendered":"http:\/\/www.raveon.com\/data_radio_info\/?p=996"},"modified":"2014-08-14T15:29:42","modified_gmt":"2014-08-14T15:29:42","slug":"220mhz-band-antennas","status":"publish","type":"post","link":"https:\/\/www.raveon.com\/data_radio_info\/220mhz-band-antennas-996\/","title":{"rendered":"220MHZ Band Antennas"},"content":{"rendered":"<p>VHF and UHF antennas are easy to find, but 220MHz band antennas for data radio modem are more difficult to find. \u00a0This Tech Blog article provides links and ideas for sourcing 220MHz mobile antennas and 220MHz base station antennas.<\/p>\n<h2>1.\u00a0\u00a0 Overview<\/h2>\n<p>Raveon produces\u00a0data radio modems at 200 MHz for Machine-to-machine (M2M) and SCADA applications. \u00a0Commercial off-the-shelf (COTS) antennas for this band can tuned\u00a0to 220MHz.\u00a0 This note details the process for the tuning of VHF 220 MHz antenna. \u00a0Raveon&#8217;s DART base stations and M8\/TK8\/TK9 series data radio modem products are available in this band.<\/p>\n<h2>2.\u00a0\u00a0 COTS Antennas<\/h2>\n<p>There are many different choices for 220MHz band antennas . This article identifies a few antennas suitable for use with 220 MHz radio modems.<\/p>\n<h3>New-Tronics Antenna Corporation<\/h3>\n<p>RX-220,\u00a0<span style=\"color: #000000;\">3.4 dB, 5\/8 wave magnet-mount mobile antenna<\/span>:<br \/>\n(<a title=\"RX-220\" href=\"http:\/\/www.new-tronics.com\/main\/html\/mobile_uhf___vhf.html\">http:\/\/www.new-tronics.com\/main\/html\/mobile_uhf___vhf.html<\/a>)<\/p>\n<p>MX-270, <span style=\"color: #000000;\">2.4dB VHF\/ 4 dB UHF<\/span>\u00a0 \u00a0magnet-mount VHF &#8211; must be cut down to resonate at 220MHz.<br \/>\n<a title=\"MX-270\" href=\"http:\/\/www.new-tronics.com\/main\/html\/mobile_mx_series_uhf___vhf.html\">(http:\/\/www.new-tronics.com\/main\/html\/mobile_mx_series_uhf___vhf.html<\/a>)<\/p>\n<h3>Comet<\/h3>\n<p>HT-224, 1.3dBi\u00a01\/4 wave<br \/>\n(<a title=\"HT-244\" href=\"http:\/\/www.cometantenna.com\/products.php?CatID=1&amp;famID=1&amp;childID=2\">http:\/\/www.cometantenna.com\/products.php?CatID=1&amp;famID=1&amp;childID=2<\/a>)<\/p>\n<p>This antenna may be available at their distributor, Ham Radio Outlet.<\/p>\n<p><a href=\"http:\/\/www.raveon.com\/data_radio_info\/wp-content\/uploads\/2014\/04\/22ANT.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-1002\" src=\"http:\/\/www.raveon.com\/data_radio_info\/wp-content\/uploads\/2014\/04\/22ANT.png\" alt=\"22ANT\" width=\"170\" height=\"415\" \/><\/a><\/p>\n<h2>Trimming an Antenna<\/h2>\n<p>The test\u00a0equipment\u00a0for tuning includes a spectrum analyzer, such as HP 8591E with tracking generator and a directional coupler, such as Narda 3000-10 and suitable connectors\/adaptors. The antenna length can be adjusted by trimming the length of the rod of the antennas. Loosen the lock-screw on the base of the antenna, remove the antenna rod, and trim it so that the antenna resonates on the desired frequency. Trim a little, re-install, re-measure resonant frequency, and repeat.<\/p>\n<p>The lowest standing wave ratio point displayed on the spectrum analyzer will be the frequency the antenna is tuned to.<\/p>\n<p>For 220MHz, the lengths of the antennas shown above are 706\u00a0mm for the RX-220 and 524\u00a0mm for the\u00a0MX-270.\u00a0 The HT-224 from Comet has fixed length which is not adjustable.<\/p>\n<p><a href=\"http:\/\/www.raveon.com\/data_radio_info\/wp-content\/uploads\/2014\/04\/sa221.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-1004\" src=\"http:\/\/www.raveon.com\/data_radio_info\/wp-content\/uploads\/2014\/04\/sa221.png\" alt=\"sa221\" width=\"425\" height=\"324\" srcset=\"https:\/\/www.raveon.com\/data_radio_info\/wp-content\/uploads\/2014\/04\/sa221.png 425w, https:\/\/www.raveon.com\/data_radio_info\/wp-content\/uploads\/2014\/04\/sa221-300x228.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>VHF and UHF antennas are easy to find, but 220MHz band antennas for data radio modem are more difficult to find. \u00a0This Tech Blog article provides links and ideas for sourcing 220MHz mobile antennas and 220MHz base station antennas. 1.\u00a0\u00a0 Overview Raveon produces\u00a0data radio modems at 200 MHz for Machine-to-machine (M2M) and SCADA applications. \u00a0Commercial [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/996"}],"collection":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/comments?post=996"}],"version-history":[{"count":8,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/996\/revisions"}],"predecessor-version":[{"id":1007,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/996\/revisions\/1007"}],"wp:attachment":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/media?parent=996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/categories?post=996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/tags?post=996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}