{"id":4418,"date":"2023-09-28T19:18:57","date_gmt":"2023-09-28T18:18:57","guid":{"rendered":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/?p=4418"},"modified":"2023-09-30T17:00:13","modified_gmt":"2023-09-30T16:00:13","slug":"nizky-vykon-adalm-pluto-sdr-oprava","status":"publish","type":"post","link":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/2023\/09\/nizky-vykon-adalm-pluto-sdr-oprava\/","title":{"rendered":"N\u00edzk\u00fd v\u00fdkon ADALM Pluto SDR – oprava"},"content":{"rendered":"\n

Ned\u00e1vno jsem narazil na jeden exempl\u00e1\u0159 SDR ADALM Pluto (Rev. D), kter\u00fd m\u011bl sn\u00ed\u017een\u00fd v\u00fdkon ve vys\u00edlac\u00ed cest\u011b. V\u00fdstupn\u00ed v\u00fdkon byl p\u0159i CW na \u00farovn\u00ed cca -18dBm (norm\u00e1ln\u00ed \u00farove\u0148 je n\u011bkde kolem -7dBm). <\/p>\n\n\n\n

<\/p>\n\n\n\n

Diagnostika Probl\u00e9mu<\/h2>\n\n\n\n

Prvn\u00ed v\u011bc, kterou bylo t\u0159eba ud\u011blat, bylo podrobn\u00e9 testov\u00e1n\u00ed a m\u011b\u0159en\u00ed. Zjistil jsem, \u017ee hlavn\u00edm probl\u00e9mem byla antistatick\u00e1 ochrana na vys\u00edlac\u00ed stran\u011b, t\u011bsn\u011b za SMA konektorem. Respektive ne p\u0159\u00edmo antistatick\u00e1 ochrana, ale vadn\u011b zap\u00e1jen\u00fd spoj pod jej\u00edmi pady. \u0160\u00ed\u0159ka mezery mezi spoji asi 0,125mm. Kuli\u010dka c\u00ednu p\u0159esahovala p\u0159es pad na ka\u017ed\u00e9 stran\u011b asi o 40\u03bcm. Je t\u0159eba podotknout, \u017ee tento exempl\u00e1\u0159 Pluta m\u011bl v\u017edy pon\u011bkud ni\u017e\u0161\u00ed vys\u00edlac\u00ed v\u00fdkon, ale jen o cca -3dB pod norm\u00e1lem. <\/p>\n\n\n\n

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Za n\u00e1hlou zm\u011bnu mohl s nejv\u011bt\u0161\u00ed pravd\u011bpodobnost\u00ed jev zvan\u00fd „Tin whisters<\/a>„, neboli \u010desky „c\u00ednov\u00e9 vousy<\/a>„:)
Tento jev je zvl\u00e1\u0161t\u011b z\u00e1ke\u0159n\u00fd, proto\u017ee se objev\u00ed nenad\u00e1le a c\u00ednov\u00e9 vousy mohou zp\u016fsobit zkrat nebo jin\u00e9 ne\u017e\u00e1douc\u00ed elektrick\u00e9 spojen\u00ed. Vznikaj\u00ed typicky na bezolovnat\u00e9 nebo olovnat\u00e9 c\u00ednov\u00e9 p\u00e1jce – na jejich povr\u0161\u00edch. Mohou r\u016fst po del\u0161\u00ed dobu, n\u011bkdy i po n\u011bkolik let do celkov\u00e9 d\u00e9lky n\u011bkolika mm.<\/p>\n\n\n\n

Antistatickou ochtanu jsem se rozhodl vyjmout zcela, pady pod n\u00ed jsem o\u010distil od zbytk\u016f c\u00ednu a tavidla. Pro\u010d? V m\u00e9 konfiguraci je ADALM Pluto v\u017edy spojeno s budi\u010dem a koncov\u00fdm stupn\u011bm. T\u00edm p\u00e1dem je antistatick\u00e1 ochrana v tomto kontextu pon\u011bkud zbyte\u010dn\u00e1.<\/p>\n\n\n\n

P\u0159em\u00fd\u0161lel jsem i o dal\u0161\u00edch mo\u017en\u00fdch p\u0159\u00ed\u010din\u00e1ch probl\u00e9mu, jako je nap\u0159\u00edklad pr\u016fraz p\u0159ep\u011b\u0165ov\u00e9 ochrany. Po dal\u0161\u00edch testech ale tato teorie neobst\u00e1la, tak\u017ee „tin whiskers“ z\u016fstal jako nejpravd\u011bpodobn\u011bj\u0161\u00ed p\u016fvodce z\u00e1vady.<\/p>\n\n\n\n

Po odstran\u011bn\u00ed v\u00fd\u0161e zm\u00edn\u011bn\u00e9 p\u0159ep\u011b\u0165ov\u00e9 ochrany jsem znovu zm\u011b\u0159il v\u00fdkon, tentokr\u00e1t byla \u00farove\u0148 -8dBm.<\/p>\n\n\n\n

Na z\u00e1v\u011br p\u0159ikl\u00e1d\u00e1m n\u011bkolik, z m\u00e9ho pohledu, poveden\u00fdch makroskopick\u00fdch sn\u00edmk\u016f ADALM Pluto.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n
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Ned\u00e1vno jsem narazil na jeden exempl\u00e1\u0159 SDR ADALM Pluto (Rev. D), kter\u00fd m\u011bl sn\u00ed\u017een\u00fd v\u00fdkon ve vys\u00edlac\u00ed cest\u011b. V\u00fdstupn\u00ed v\u00fdkon byl p\u0159i CW na \u00farovn\u00ed cca -18dBm (norm\u00e1ln\u00ed \u00farove\u0148 je n\u011bkde kolem -7dBm). Diagnostika Probl\u00e9mu Prvn\u00ed v\u011bc, kterou bylo t\u0159eba Pokra\u010duj ve \u010dten\u00ed \u2192<\/a><\/p>\n","protected":false},"author":1,"featured_media":4420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,189],"tags":[1271,1269],"class_list":["post-4418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ham","category-opravy-ham","tag-adalm-pluto-low-power","tag-tin-whiskers"],"_links":{"self":[{"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/posts\/4418","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/comments?post=4418"}],"version-history":[{"count":10,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/posts\/4418\/revisions"}],"predecessor-version":[{"id":4437,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/posts\/4418\/revisions\/4437"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/media\/4420"}],"wp:attachment":[{"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/media?parent=4418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/categories?post=4418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ok2haz.ok2kld.cz\/ok2haz\/wp-json\/wp\/v2\/tags?post=4418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}