先日，RTTYのコンテストにパートながらもそこそこ参加したところ，翌朝耳の調子が悪くなりました．明らかに聞こえが違いました．<\/p>\n
以後はRTTYのコンテストには参加せず，普段の運用も，サブキャリアの周波数を長年使ってきた2125Hzから1600Hzに変えることにしました．<\/p>\n
昨日は，フィールドデーコンテストで，やはりパートでCWのみ参加しましたが2時間くらい運用したあと，妻の話が明らかに聞き取りにくくなりました．<\/p>\n
CWでは同じ周波数の音を数時間単位で連続で聞き続けているわけですから，耳への負担は大きい訳です．ヘッドフォンは耳に悪いと信じて，スピーカーで音を出すようにしていますが，そうすると，エアコン，無線機器のファンの音，近隣を走る違法改造された車から発せられる騒音を避けるためにかなりの音圧で聞いています．これも影響が小さくないと思います．<\/p>\n
実はここ数年の健康診断で左耳の高音に対する聴力が低下していることが判明していますが，これはスピーカーを左側に置く習慣を長く続けていることと矛盾しないと考えています．<\/p>\n
今後は，CWの運用は1時間以上連続しないこと，音質の良いヘッドフォンを使い，音量は最小限にすることを励行し，また，スピーカーを右側に置くのも試してみようと思います．<\/p>\n","protected":false},"excerpt":{"rendered":"
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