[問題] 為什麼訊號要升到高頻再傳呢?
把訊號升到高頻的好處
以前我只知道 避免低頻雜訊,接收天線較短
但後來聽到有人說"可傳送的bit rate較高"
請問這是為什麼呢?
另外
升到高頻有什麼缺點嗎?
剛進入通訊這行不久
有很多知識不懂
謝謝大家幫忙
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