{"id":173,"date":"2016-11-14T10:36:49","date_gmt":"2016-11-14T08:36:49","guid":{"rendered":"http:\/\/lz2jr.com\/blog\/?p=173"},"modified":"2016-11-15T08:07:19","modified_gmt":"2016-11-15T06:07:19","slug":"crystal-filter-9mhz-2-7khz","status":"publish","type":"post","link":"https:\/\/lz2jr.com\/blog\/index.php\/crystal-filter-9mhz-2-7khz\/","title":{"rendered":"Crystal filter 9MHz 2.7kHz"},"content":{"rendered":"

One of the most important modules in the home made HF transceiver project is the crystal filter. It is made of individual quartz crystals with matched parameters – Fser. (+\/- 15Hz), Lm and Q factor > 100 000.\u00a0 A large quantity of 9MHz oscillator crystals were purchased to extract only few to fit those requirements. Three type of quartz filters are used in this project – main (roofing) filter, narrow filter for SSB or CW modes and noise filter. All the filters are internally impedance matched to 50 ohm input\/output circuitry and individually aligned.<\/p>\n

\"img_3916\"<\/a>\u00a0 \"img_3917\"<\/a><\/p>\n

Here is information about first – wide 2.7kHz SSB filter:<\/p>\n

Filter type\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Chebyshev 8 pole<\/p>\n

Center frequency\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9MHz<\/p>\n

Bandwith at -6db\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2.7kHz<\/p>\n

shape factor -6\/-60db\u00a0\u00a0\u00a0 1.75<\/p>\n

IN\/OUT impedance\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 50ohm<\/p>\n

Band pass ripple\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <1db<\/p>\n

Stop band attenuation\u00a0\u00a0\u00a0 >80db<\/p>\n

VNA plot<\/p>\n

\"9mhz-2-7khz\"<\/a><\/p>\n

Circuit diagram. Chebyshev 8 pole ladder type crystal filter<\/p>\n

\"xtalfil-9mhz-2-7khz\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

One of the most important modules in the home made HF transceiver project is the crystal filter. It is made of individual quartz crystals with matched parameters – Fser. (+\/- 15Hz), Lm and Q factor > 100 000.\u00a0 A large<\/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":[16],"tags":[],"class_list":["post-173","post","type-post","status-publish","format-standard","hentry","category-crystal-filters-9mhz"],"_links":{"self":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/173","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=173"}],"version-history":[{"count":5,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/173\/revisions"}],"predecessor-version":[{"id":191,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/173\/revisions\/191"}],"wp:attachment":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}