{"id":3086,"date":"2014-09-19T06:38:15","date_gmt":"2014-09-18T21:38:15","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=3086"},"modified":"2014-09-19T06:38:15","modified_gmt":"2014-09-18T21:38:15","slug":"%e5%b8%af%e5%9f%9f%e5%b9%85%e3%81%8c%e5%90%8c%e3%81%98%e3%81%aa%e3%82%89%e3%83%8f%e3%82%a4%e3%83%ac%e3%83%95%e3%81%ae%e6%96%b9%e3%81%8c%e8%89%af%e3%81%84","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=3086","title":{"rendered":"\u5e2f\u57df\u5e45\u304c\u540c\u3058\u306a\u3089\u30cf\u30a4\u30d5\u30ec\u306e\u65b9\u304c\u826f\u3044"},"content":{"rendered":"

同じ帯域のルーフィングフィルターが作れるならば，第１IFは，ローフレより，ハイフレの方が，映像混信に強く，バンドによる感度のバラツキなども生じにくく，広帯域の連続受信が可能ですから，よいに決まってます．<\/p>\n

ですから，PT-8000Aや，IC-7850のほうが，FTDX5000, TS-990などより優れている可能性が高いです．<\/p>\n

ただ，ハイフレで帯域が狭いフィルターは，いまのところは，安くはできないので，当分はダウンコンバージョンは，中級機に使われる技術だと思います^^;<\/p>\n

これらをしのぐリグは，<\/del>20bitを超える解像度の高速A\/Dコンバータが開発されて，それを搭載したSDRを待つしかないですね．私が生きている間に出るかなぁ^^;<\/p>\n

あと，現在のSDRの多くは，「要PC」(それもWindows)というのが，気に入らないです^^;<\/p>\n","protected":false},"excerpt":{"rendered":"

\u540c\u3058\u5e2f\u57df\u306e\u30eb\u30fc\u30d5\u30a3\u30f3\u30b0\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u4f5c\u308c\u308b\u306a\u3089\u3070\uff0c\u7b2c\uff11IF\u306f\uff0c\u30ed\u30fc\u30d5\u30ec\u3088\u308a\uff0c\u30cf\u30a4\u30d5\u30ec\u306e\u65b9\u304c\uff0c\u6620\u50cf\u6df7\u4fe1\u306b\u5f37\u304f\uff0c\u30d0\u30f3\u30c9\u306b\u3088\u308b\u611f\u5ea6\u306e\u30d0\u30e9\u30c4\u30ad\u306a\u3069\u3082\u751f\u3058\u306b\u304f\u304f\uff0c\u5e83\u5e2f\u57df\u306e\u9023\u7d9a\u53d7\u4fe1\u304c\u53ef\u80fd\u3067\u3059\u304b\u3089\uff0c\u3088\u3044\u306b\u6c7a\u307e\u3063\u3066\u307e\u3059\uff0e \u3067\u3059\u304b\u3089\uff0cPT-8000A\u3084\uff0cIC-7850\u306e\u307b\u3046\u304c\uff0cFTDX5000, TS-990\u306a\u3069\u3088\u308a\u512a\u308c\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u3067\u3059\uff0e \u305f\u3060\uff0c\u30cf\u30a4\u30d5\u30ec\u3067\u5e2f\u57df\u304c\u72ed\u3044\u30d5\u30a3\u30eb\u30bf\u30fc\u306f\uff0c\u3044\u307e\u306e\u3068\u3053\u308d\u306f\uff0c\u5b89\u304f\u306f\u3067\u304d\u306a\u3044\u306e\u3067\uff0c\u5f53\u5206\u306f\u30c0\u30a6\u30f3\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\uff0c\u4e2d\u7d1a\u6a5f\u306b\u4f7f\u308f\u308c\u308b\u6280\u8853\u3060\u3068\u601d\u3044\u307e\u3059^^; \u3053\u308c\u3089\u3092\u3057\u306e\u3050\u30ea\u30b0\u306f\uff0c20bit\u3092\u8d85\u3048\u308b\u89e3\u50cf\u5ea6\u306e\u9ad8\u901fA\/D\u30b3\u30f3\u30d0\u30fc\u30bf\u304c\u958b\u767a\u3055\u308c\u3066\uff0c\u305d\u308c\u3092\u642d\u8f09\u3057\u305fSDR\u3092\u5f85\u3064\u3057\u304b\u306a\u3044\u3067\u3059\u306d\uff0e\u79c1\u304c\u751f\u304d\u3066\u3044\u308b\u9593\u306b\u51fa\u308b\u304b\u306a\u3041^^; \u3042\u3068\uff0c\u73fe\u5728\u306eSDR\u306e\u591a\u304f\u306f\uff0c\u300c\u8981PC\u300d(\u305d\u308c\u3082Windows)\u3068\u3044\u3046\u306e\u304c\uff0c\u6c17\u306b\u5165\u3089\u306a\u3044\u3067\u3059^^;<\/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":[],"class_list":["post-3086","post","type-post","status-publish","format-standard","hentry","category-ham-radio"],"publishpress_future_action":{"enabled":false,"date":"2026-04-18 12:06:44","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\/3086","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=3086"}],"version-history":[{"count":0,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=\/wp\/v2\/posts\/3086\/revisions"}],"wp:attachment":[{"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}