{"id":9904,"date":"2019-10-27T21:48:09","date_gmt":"2019-10-27T12:48:09","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=9904"},"modified":"2019-10-27T21:48:09","modified_gmt":"2019-10-27T12:48:09","slug":"catalina-ug%e3%81%ae%e5%be%8c%e5%a7%8b%e6%9c%ab","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=9904","title":{"rendered":"Catalina UG\u306e\u5f8c\u59cb\u672b"},"content":{"rendered":"\n

結局，WSJT-Xのみは，Windowsの実機(AMD A6 Windows 10 32bit)で，動かすことにしました．その他のアマチュア無線関係のソフト, N1MM+, MMTTY, Log200は，引き続き，Mac miniのVMWare Fusion 11.5下で，Windows 8.1の仮想マシンを走らせて，そこで動かします．<\/p>\n\n\n\n

VMWare Fusion上のWindows 8.1仮想マシンと，USBリソース（CAT用のUSB-serialアダプターと音声信号入出力用USB-audio）は，KVM Switchで切り替えると不具合が生じました<\/a>が，これを避けるために，基本的に両方のWindows環境を起動しないこととします．また，KVM SwitchでMacとWindows実機をどうしても切り替える時は，USBの切り替えを伴わない，HOT Key 2回, ポート番号, k, リターンという手順で切り替えることにします．<\/p>\n\n\n\n

Windows実機では，S\/Nが-20dBを下回る信号もちゃんとデコードしてくれます．macOS版のWSJT-Xと同等のデコード性能と思います．<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

たぶん，VMWare Fusion下では，単純な時間遅れが生じているのかもしれませんが，それより問題になるのは，スケジューラーによるタスクの切り替えで，仮想マシンの時間軸にjitterが発生して非線形（時間のjitterは，相対的に入力信号のjitterになります）となっていることでしょう．このため信号のデコード（信号を重ね合わせてランダムノイズを除去する）で大きな不利になっているのでしょう．あくまで推測で，確認・検証などはしません^^; 1<\/a><\/sup>傍証として，VMWare Fusionで動かしているWindows 8.1 (32bit)上で，DFUSe Demoを使って，nanoVNAにファームウェア（固件）を書き込むのがうまく行かない（書き込みの途中で必ずエラーになる）というのがあります．<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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