{"id":496,"date":"2010-09-26T16:45:04","date_gmt":"2010-09-26T14:45:04","guid":{"rendered":"http:\/\/dh5ym.hopto.org\/wiki\/?p=496"},"modified":"2010-09-26T16:45:04","modified_gmt":"2010-09-26T14:45:04","slug":"ft-817-synthesizer-problems","status":"publish","type":"post","link":"https:\/\/dh5ym.hopto.org\/wiki\/?p=496","title":{"rendered":"FT-817 synthesizer problems ?"},"content":{"rendered":"<p>Today i had a look to the output spectrum of my FT-817 i use for 23cm operations. I looked to the IF signal of 144MHz.<br \/>\nThere are several spurs with a distance of around 28.5kHz of each other and <50dB of the wanted signal. This corresponds to my observation that strong neighbour stations can be heard in regular steps again and again. It happens in CW and also in SSB mode. Does anyone have a idea what could be the cause ?\nI assume the problem is somewhere in the synthesizer...\n\n<strong>Update 2010\/10\/01<\/strong><br \/>\nWhen looking to older screenshots i saw that they were not that spurious. The difference was, that i did not use the switched power supply from Alinco at that time but a linear one. So i checked again with a linear supply today. Result: Most of the spurs disappeared. Just some weaker ones are remaining.<\/p>\n<div id=\"attachment_497\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"..\/wiki\/wp-content\/uploads\/2010\/09\/817_144mhz_cwtone_span400khz.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-497\" src=\"..\/wiki\/wp-content\/uploads\/2010\/09\/817_144mhz_cwtone_span400khz-300x240.png\" alt=\"\" title=\"817_144mhz_cwtone_span400khz\" width=\"300\" height=\"240\" class=\"size-medium wp-image-497\" srcset=\"https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2010\/09\/817_144mhz_cwtone_span400khz-300x240.png 300w, https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2010\/09\/817_144mhz_cwtone_span400khz-624x500.png 624w, https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2010\/09\/817_144mhz_cwtone_span400khz.png 688w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-497\" class=\"wp-caption-text\">FT-817 CW constant tone, 5W, span 400kHz<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Today i had a look to the output spectrum of my FT-817 i use for 23cm operations. I looked to the IF signal of 144MHz. There are several spurs with a distance of around 28.5kHz of each other and<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,15],"tags":[],"class_list":["post-496","post","type-post","status-publish","format-standard","hentry","category-amateur-radio","category-rf"],"_links":{"self":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/496","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=496"}],"version-history":[{"count":0,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/496\/revisions"}],"wp:attachment":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}