{"id":375,"date":"2014-01-08T23:32:37","date_gmt":"2014-01-08T23:32:37","guid":{"rendered":"http:\/\/warc.org.uk\/?page_id=375"},"modified":"2026-02-25T11:38:45","modified_gmt":"2026-02-25T11:38:45","slug":"the-cdg2000-front-end-board","status":"publish","type":"page","link":"https:\/\/warc.org.uk\/?page_id=375","title":{"rendered":"The CDG2000 Front End Board"},"content":{"rendered":"<p><b>The CDG2000 Front End Board<\/b><\/p>\n<p>This is the first module in the transceiver, and one of the critical ones. It contains the attenuators, switched bandpass filters, H mode mixer, roofing filters and TX\/RX switching. It is controlled by means of an I2C interface, details of which are available from Philips semiconductors.<\/p>\n<p>Here you can download an early version of the article submitted to RadCom, the PCB artwork, pictures of the performance and supporting material.<\/p>\n<p>Note that this version of the front end uses a 74AC74 in the mixer to generate the clock.<\/p>\n<p>&nbsp;<\/p>\n<table border=\"1\" width=\"648\" cellspacing=\"1\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"32%\"><a href=\"https:\/\/warc.org.uk\/?page_id=796\">Early version of article<\/a><\/td>\n<td valign=\"top\" width=\"32%\"><a href=\"https:\/\/www.warc.org.uk\/cdg2000\/front_end\/picture_top.pdf\">Hi res picture of top of board<\/a><\/td>\n<td valign=\"top\" width=\"35%\"><a href=\"http:\/\/www.warc.org.uk\/cdg2000\/front_end\/picture_bottom.pdf\">Hi res picture of bottom of board<\/a><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"32%\"><a href=\"https:\/\/warc.org.uk\/?page_id=818\">Performance data<\/a><\/td>\n<td valign=\"top\" width=\"32%\"><a href=\"https:\/\/www.warc.org.uk\/cdg2000\/front_end\/pcb\/pcb.htm\">PCB<\/a><\/td>\n<td valign=\"top\" width=\"35%\">\u00a0<a href=\"http:\/\/www.warc.org.uk\/cdg2000\/front_end\/pcb\/v9\/frontendlist_rev_b.doc\">Parts List<\/a><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"32%\"><a href=\"http:\/\/www.warc.org.uk\/cdg2000\/front_end\/schematics\/front_end_cdg2000_board_1_part_1.pdf\">Schematic part 1<\/a><\/td>\n<td valign=\"top\" width=\"32%\">\u00a0<a href=\"http:\/\/www.warc.org.uk\/cdg2000\/front_end\/schematics\/front_end_cdg2000_board_1_part_2.pdf\">Schematic part 2<\/a><\/td>\n<td valign=\"top\" width=\"35%\">\u00a0\u00a0<a href=\"http:\/\/www.warc.org.uk\/cdg2000\/front_end\/schematics\/front_end_cdg2000_board_1_part_3.pdf\">Schematic part 3<\/a><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"32%\">\u00a0<a href=\"http:\/\/www.warc.org.uk\/cdg2000\/front_end\/schematics\/front_end_cdg2000_board_1_part_4.pdf\">Schematic part 4<\/a><\/td>\n<td valign=\"top\" width=\"32%\"><\/td>\n<td valign=\"top\" width=\"35%\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a href=\"http:\/\/www.warc.org.uk\/cdg2000\/the_cdg2000_transceiver.htm\">Return to CDG2000 Home Page<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The CDG2000 Front End Board This is the first module in the transceiver, and one of the critical ones. It contains the attenuators, switched bandpass filters, H mode mixer, roofing filters and TX\/RX switching. It is controlled by means of an I2C interface, details of which are available from Philips\u2026<\/p>\n<p class=\"continue-reading-button\"> <a class=\"continue-reading-link\" href=\"https:\/\/warc.org.uk\/?page_id=375\">Continue reading<i class=\"crycon-right-dir\"><\/i><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":81,"menu_order":0,"comment_status":"open","ping_status":"open","template":"templates\/template-page-with-intro.php","meta":{"footnotes":""},"class_list":["post-375","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/warc.org.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=375"}],"version-history":[{"count":8,"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/375\/revisions"}],"predecessor-version":[{"id":125571,"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/375\/revisions\/125571"}],"up":[{"embeddable":true,"href":"https:\/\/warc.org.uk\/index.php?rest_route=\/wp\/v2\/pages\/81"}],"wp:attachment":[{"href":"https:\/\/warc.org.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}