{"id":3665,"date":"2015-01-16T18:11:20","date_gmt":"2015-01-16T09:11:20","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=3665"},"modified":"2015-01-16T18:11:20","modified_gmt":"2015-01-16T09:11:20","slug":"lsb%e3%81%af7048%e3%80%9c%e3%81%a8%e6%98%8e%e8%a8%98%e3%81%97%e3%81%aa%e3%81%91%e3%82%8c%e3%81%b0%e3%81%84%e3%81%91%e3%81%aa%e3%81%84%e3%83%ac%e3%83%99%e3%83%ab","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=3665","title":{"rendered":"“LSB\u306f7048\u301c”\u3068\u660e\u8a18\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u30ec\u30d9\u30eb"},"content":{"rendered":"

私が，電話級（現在の第４級）アマチュア無線技士の免許を取って，HFで運用を初めたころ，既に電話はSSBばかりになっていました．<\/p>\n

しかし，国家試験の勉強をした教材にはSSBのことはほとんど出てなくて，理解したといえるまではずいぶん時間がかかったように覚えています1<\/a><\/sup>中学生に周波数スペクトルを理解しろといわれてもなかなか^^; <\/span>．<\/p>\n

要するに電波は周波数に幅がある．中波のAM放送で，例えば，NHK第一の東京は，594kHzといわれているけれど，それは搬送波の周波数であって，実際には，最大で，586.5kHz〜601.5kHz2<\/a><\/sup>占有周波数の許容値は15kHzとされています．<\/span>の範囲に信号が出ています．<\/p>\n

ここまでは，中学生でも何となく分かりました．何にも変調がかかっていなければ，594kHzに綺麗な搬送波があるだけですが，変調がかかると，上下に音声成分が広がる．<\/p>\n

SSBが厄介なところは，LSBなら下側だけに，USBなら上側だけに広がり，しかも，ダイヤルが示しているキャリアポイントの周波数には，何も信号が出ていないのです3<\/a><\/sup>これはあくまで，理想的な場合で，現実にはいくばくかの「キャリア漏れ」があります．<\/span>．<\/p>\n

アマチュア無線の短波帯の許容占有帯域は3kHzなので，無線機のダイヤルを7045kHzに合わせてLSBを送信すると，7042〜7045kHzに電波が出るんです．これでは新しいバンドプランから逸脱することになります．<\/p>\n

解っている人には「何をいまさら」の話なんですが^^;<\/p>\n

というような，私が中学生のころに苦労して分かったか分からないレベルの話が，分かってない皆さんが多いようです．<\/p>\n

JARLのバンドプランの表には，7MHz帯の図の下に，<\/p>\n

LSB\u306f\uff0c7048kHz\u301c<\/pre>\n
と明記しないといけないと思います．というか，これ書くだけでずいぶん違うと思います．<\/p>\n
私が開局した当時，LSBで7033kHzより下はバンドプラン逸脱だとなんとか分かっていて，実際に聞いてみると，7030kHzにOTと呼ばれる人たちが入れ替わり出ていました．当時はバンドプランには法的な強制力はなかったからとはいえ，人の模範となるべき人たちがアレでは^^; その記憶があるので，”LSBは7048kHz〜”の明記はぜひ必要と思います．モラルとか何とか以前に，分かってない人多いんですから^^;;<\/p>\n
追記(2016\/07\/01)<\/h3>\n
2016年現在，コンテスト規約の補足に，上記のようなことが記されています．<\/p>\n","protected":false},"excerpt":{"rendered":"
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\u305d\u306e\u8a18\u61b6\u304c\u3042\u308b\u306e\u3067\uff0c”LSB\u306f7048kHz\u301c”\u306e\u660e\u8a18\u306f\u305c\u3072\u5fc5\u8981\u3068\u601d\u3044\u307e\u3059\uff0e\u30e2\u30e9\u30eb\u3068\u304b\u4f55\u3068\u304b\u4ee5\u524d\u306b\uff0c\u5206\u304b\u3063\u3066\u306a\u3044\u4eba\u591a\u3044\u3093\u3067\u3059\u304b\u3089^^;; \u8ffd\u8a18(2016\/07\/01) 2016\u5e74\u73fe\u5728\uff0c\u30b3\u30f3\u30c6\u30b9\u30c8\u898f\u7d04\u306e\u88dc\u8db3\u306b\uff0c\u4e0a\u8a18\u306e\u3088\u3046\u306a\u3053\u3068\u304c\u8a18\u3055\u308c\u3066\u3044\u307e\u3059\uff0e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_daextam_enable_autolinks":"","footnotes":""},"categories":[33],"tags":[416],"class_list":["post-3665","post","type-post","status-publish","format-standard","hentry","category-ham-radio","tag-ssb"],"publishpress_future_action":{"enabled":false,"date":"2026-05-23 03:33:19","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/3665","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3665"}],"version-history":[{"count":0,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/3665\/revisions"}],"wp:attachment":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3665"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3665"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3665"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}