{"id":27274,"date":"2021-05-28T11:56:04","date_gmt":"2021-05-28T10:56:04","guid":{"rendered":"https:\/\/rsgb.org\/main\/?p=27274"},"modified":"2023-07-05T11:52:59","modified_gmt":"2023-07-05T10:52:59","slug":"7-june-tbc","status":"publish","type":"post","link":"https:\/\/rsgb.org\/main\/blog\/tonight-at-eight-archive\/2021\/05\/28\/7-june-tbc\/","title":{"rendered":"7 June 2021 &#8211; The Sherwood Ratings: Transceiver Performance for the HF DX &amp; Contest Operator by Rob Sherwood, NC0B"},"content":{"rendered":"<blockquote><p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/ZLkEe6oOtsc?start=257\" width=\"100%\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p><\/blockquote>\n<h3>Rob&#8217;s presentation<\/h3>\n<p>Rob Sherwood\u2019s name has become something of a standard in the radio amateur equipment world as a trusted comparison guide to the technical performance of a wide range of transceivers.<\/p>\n<p>This presentation will explain the process that Sherwood Engineering go through to produce detailed performance figures for a wide range of transceivers.<\/p>\n<p>Rob will talk about the acquisition of a true random sample of the radio, through to the technical processes of measurement and the compilation and presentation of comparative results.<\/p>\n<p>The presentation will also include details of Rob&#8217;s recent findings on the long awaited new Elecraft K4D.<\/p>\n<p>Rob will also talk about how modern receivers have become very good but how generally many transmitters need attention to some aspects of their performance.<\/p>\n<h3>About Rob<\/h3>\n<p>Amateur radio began for Rob in 1961 in Cincinnati, Ohio, as both a novice and general-class operator.<\/p>\n<p>After graduating college in 1969 with a degree in physics, he moved to Denver and worked for KOA radio as an engineer until 1987.<\/p>\n<p>While at KOA, he maintained their 50 KW AM and FM transmitters, microwave links and studio equipment.<\/p>\n<p>The year 1974 saw the beginning of Sherwood Engineering, offering roofing filters and upgrade kits for the Drake R-4C.<\/p>\n<p>In 1976, Rob started measuring receiver performance on dozens of radios, since reviews in QST did not correlate with actual on-air observations at crunch time in CW contests.<\/p>\n<p>In 1977, <em>Ham Radio Magazine<\/em> published the first of several of his articles on receiver problems and cures, vertical antenna ground systems and mobile antenna efficiency.<\/p>\n<p>Those articles are available on their web site as PDF files.<\/p>\n<p>Receiver test data is now web based with 150 transceiver and receiver listings.<\/p>\n<p>Around 14years ago, Rob built his dream contest station on 10 acres east of Ft. Collins, Colorado on the Pawnee Grassland.<\/p>\n<p>This has made it possible to evaluate top transceivers in major contests in a real-world environment to augment his laboratory data.<\/p>\n<p>This rural setting has allowed Rob to focus his interest on effective antennas.<\/p>\n<p>Six towers support nine mono-band HF Yagis, plus 6m, 2m and 70cm Yagis, plus wire antennas for 160, 40 and 30 metres.<\/p>\n<h3>Find out more<\/h3>\n<ul>\n<li><a href=\"http:\/\/sherweng.com\/table.html\" target=\"_blank\" rel=\"noopener\"><strong> The Sherwood comparison table<\/strong><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Rob&#8217;s presentation Rob Sherwood\u2019s name has become something of a standard in the radio amateur equipment world as a trusted comparison guide to the technical performance of a wide range of transceivers. This presentation will explain the process that Sherwood Engineering go through to produce detailed performance figures for a wide range of transceivers. Rob [&hellip;]<\/p>\n","protected":false},"author":20358,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[381],"tags":[],"class_list":["post-27274","post","type-post","status-publish","format-standard","hentry","category-tonight-at-eight-archive"],"_links":{"self":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/posts\/27274","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/users\/20358"}],"replies":[{"embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/comments?post=27274"}],"version-history":[{"count":0,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/posts\/27274\/revisions"}],"wp:attachment":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/media?parent=27274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/categories?post=27274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/tags?post=27274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}