{"id":36072,"date":"2013-08-01T00:00:05","date_gmt":"2013-07-31T22:00:05","guid":{"rendered":"http:\/\/www.cqdx.ru\/ham\/?p=36072"},"modified":"2023-10-08T09:27:47","modified_gmt":"2023-10-08T07:27:47","slug":"sdr-4-hf-receiver","status":"publish","type":"post","link":"https:\/\/www.cqdx.ru\/ham\/new-equipment\/sdr-4-hf-receiver\/","title":{"rendered":"SDR-4+ HF Receiver"},"content":{"rendered":"<p>The SDR-4+ is an HF general coverage SDR receiver covering from 0.85 to 40 MHz.<br \/>\nIt has a Si570 low noise synthesised VFO, relay switched band pass filtering, ultra high IP3 E-PHEMT RF amplifier and a built-in USB soundcard.<\/p>\n<p><a href=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2013\/07\/sdr-4_front_medium.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-36073 \" title=\"sdr-4_front_medium\" src=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2013\/07\/sdr-4_front_medium.jpg\" alt=\"\" width=\"803\" height=\"535\" srcset=\"https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2013\/07\/sdr-4_front_medium.jpg 530w, https:\/\/www.cqdx.ru\/ham\/wp-content\/uploads\/2013\/07\/sdr-4_front_medium-300x200.jpg 300w\" sizes=\"auto, (max-width: 803px) 100vw, 803px\" \/><\/a><\/p>\n<p><em>Key design features include:<\/em><\/p>\n<p>Antenna isolation transformer with a 50 or 450 ohm impedance input for use with coax fed antennas or random wire antennas<\/p>\n<ul>\n<li>Extra antenna isolation when the receiver is powered down<\/li>\n<li>Relay switched RF band pass filters<\/li>\n<li>RF amplifier now using a ultra high IP3 E-PHEMT RF amplifier in the receiver front end<\/li>\n<li>Built-in USB stereo soundcard<\/li>\n<li>3.5mm soundcard audio output for headphone monitoring or connection to datamodes program<\/li>\n<li>3.5mm IQ audio output for connection to external high sampling rate sound cards<\/li>\n<li>Built in a compact aluminium case 175 x 106 x 30 mm<\/li>\n<\/ul>\n<p>Following customer feedback and design work on our HF\/VHF\/UHF Multicoupler we have revised the SDR-4 and released the SDR-4+. This has a revised RF front end using a ultra high IP3 E-PHEMT RF amplifier, an IQ audio output to feed external sound cards and other revisions to improve RF performance, gain distribution, IQ balance and the SDR display.<\/p>\n<p>The price of the revised SDR-4+ receiver is ?169.95 plus shipping. At current rates that&#8217;s $258.32 or 198.84 Euro.<\/p>\n<p>Read also: <a href=\"https:\/\/www.cqdx.ru\/ham\/?s=SDR-4%2B\">SDR-4<\/a><\/p>\n<p><a href=\"HF Receiver\" target=\"_blank\" rel=\"noopener\">Link<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The SDR-4+ is an HF general coverage SDR receiver covering from 0.85 to 40 MHz. It has a Si570 low noise synthesised VFO, relay switched band pass filtering, ultra high IP3 E-PHEMT RF amplifier and a built-in USB soundcard. Key design features include: Antenna isolation transformer with a 50 or 450 ohm impedance input for&hellip;<\/p>\n","protected":false},"author":2,"featured_media":36073,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[304,421],"class_list":["post-36072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-equipment","tag-new-equipment-2","tag-sdr","category-8","description-off"],"_links":{"self":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts\/36072","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/comments?post=36072"}],"version-history":[{"count":0,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/posts\/36072\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/media\/36073"}],"wp:attachment":[{"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/media?parent=36072"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/categories?post=36072"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cqdx.ru\/ham\/wp-json\/wp\/v2\/tags?post=36072"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}