{"id":434,"date":"2019-02-25T23:54:17","date_gmt":"2019-02-25T21:54:17","guid":{"rendered":"http:\/\/lz2jr.com\/blog\/?p=434"},"modified":"2019-02-25T23:54:17","modified_gmt":"2019-02-25T21:54:17","slug":"lo-board","status":"publish","type":"post","link":"https:\/\/lz2jr.com\/blog\/index.php\/lo-board\/","title":{"rendered":"LO board"},"content":{"rendered":"

LO board provides all oscillator signals needed for signal conversion and mixing. The board consists of the following components:<\/p>\n

– LO first oscillator realized by U2 – SI570 (570CAC000141DG), 3 switchable low pass filters: 10.8-15MHz; 15-24MHz; 24-39MHz. Filter switching is performed by I2C chip PCA9536
\n– 9MHz generators – U3 (SI5351) BFO, CW sidetone, beeps, U1 (SA-612) balanced mixer which acts as CW\/SSB monitor product detector, digital poteniometer – U7 (MCP4018-502E)
\n– Tone shaping, (tones on\/off ) circuitry – T1,T2,T5
\n– Temperature compensation oven made by thermo resistor R14 and T3,T4<\/p>\n

\"\"<\/a><\/p>\n

PCB component side<\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

 <\/p>\n

In order to achieve good results with low harmonic content and stability – PCB board is well shielded in two component metal tin can:
\n\"\"<\/a>\"\"<\/a><\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

LO board provides all oscillator signals needed for signal conversion and mixing. The board consists of the following components: – LO first oscillator realized by U2 – SI570 (570CAC000141DG), 3 switchable low pass filters: 10.8-15MHz; 15-24MHz; 24-39MHz. Filter switching is<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[13,24,15],"tags":[],"class_list":["post-434","post","type-post","status-publish","format-standard","hentry","category-hf-home-made-transceiver","category-lo-local-oscillator-bfo-beep-sidetones-ssb-monitor","category-modules"],"_links":{"self":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=434"}],"version-history":[{"count":1,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/434\/revisions"}],"predecessor-version":[{"id":438,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/434\/revisions\/438"}],"wp:attachment":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}