maximum usable frequency
Alternative form of isatic acid
(vulgar) extremely/very bad
(radio) The highest frequency that allows radio waves to be reflected off the ionosphere.
Inadequately advertised.
コンテスト中、アマチュア無線家は送信する前に電離層で電波を反射できる最高周波数（最大有効周波数）を確認して、信号が海を越えて届くことを確かめた。
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DiQt
Free
★★★★★★★★★★
