{"id":955,"date":"2020-12-11T11:39:59","date_gmt":"2020-12-11T06:39:59","guid":{"rendered":"https:\/\/nelt.info\/?p=955"},"modified":"2020-12-11T11:39:59","modified_gmt":"2020-12-11T06:39:59","slug":"analog-repeater-bars","status":"publish","type":"post","link":"https:\/\/nelt.info\/?p=955&lang=en","title":{"rendered":"Analog Repeater"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Purpose<br>The \u201cBARS\u201d repeater extends the coverage of VHF radios<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>in difficult, hard-to-reach terrain,<\/li><li>where there is no equipment shelter or 220 V mains power,<\/li><li>on tall masts, to shorten the antenna feeder cable.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Main specifications<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Frequency range<\/td><td>146\u2013174 MHz<\/td><\/tr><tr><td>Rx sensitivity<\/td><td>0.2 \u00b5V for 12 dB S\/N<\/td><\/tr><tr><td>Tx power<\/td><td>6\u20138 W<\/td><\/tr><tr><td>Energy reserve<\/td><td>400 h<\/td><\/tr><tr><td>Solar panel<\/td><td>50 W, 17 V, 3.5 A<\/td><\/tr><tr><td>Operating temperature<\/td><td>-30 to +60 \u00baC<\/td><\/tr><tr><td>Telemetry<\/td><td>GMSK 1200 baud<\/td><\/tr><tr><td>Interface<\/td><td>RS-232<\/td><\/tr><tr><td>Dimensions<\/td><td>520\u00d7610\u00d7300 mm<\/td><\/tr><tr><td>Weight<\/td><td>18 kg<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"621\" height=\"442\" src=\"https:\/\/nelt.info\/wp-content\/uploads\/2020\/12\/bars1.jpg\" alt=\"\" class=\"wp-image-747\" srcset=\"https:\/\/nelt.info\/wp-content\/uploads\/2020\/12\/bars1.jpg 621w, https:\/\/nelt.info\/wp-content\/uploads\/2020\/12\/bars1-300x214.jpg 300w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><figcaption>Two repeaters installed in the Pamirs at altitudes of 4,000 and 4,700 m were enough to provide reliable round-the-clock VHF coverage along 150 km of a high-mountain valley with complex terrain.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advantages<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Autonomy<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The repeater is fully autonomous and needs neither maintenance nor a shelter.<\/li><li>It is powered by a solar panel and a battery.<\/li><li>A thermal control system automatically keeps the optimum internal temperature over a wide range of outside temperatures.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Efficiency<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>High-altitude siting and a directional antenna achieve coverage of around 200 km with low transmitter power and energy consumption.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Remote access<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Repeater settings \u2014 date, time, operating mode and battery charge control \u2014 can be changed remotely via the telemetry unit over the main radio channel.<\/li><li>The telemetry receiver unit can be fitted to any subscriber station.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Self-diagnostics<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The repeater measures battery voltage, solar charging current and energy, and outside and inside temperature.<\/li><li>This data and the current repeater settings are transmitted automatically once a day, or on request.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Compact<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The complete repeater with mast, antenna and solar panel weighs no more than 35 kg.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Installation<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>No shelter is needed; the repeater can be installed in a trench next to the mast.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>PurposeThe \u201cBARS\u201d repeater extends the coverage of VHF radios in difficult, hard-to-reach terrain, where there is no equipment shelter or 220 V\u2026<\/p>\n","protected":false},"author":1,"featured_media":746,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[74],"tags":[],"class_list":["post-955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-developments-en"],"_links":{"self":[{"href":"https:\/\/nelt.info\/index.php?rest_route=\/wp\/v2\/posts\/955","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nelt.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nelt.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nelt.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nelt.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=955"}],"version-history":[{"count":0,"href":"https:\/\/nelt.info\/index.php?rest_route=\/wp\/v2\/posts\/955\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nelt.info\/index.php?rest_route=\/wp\/v2\/media\/746"}],"wp:attachment":[{"href":"https:\/\/nelt.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nelt.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nelt.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}