Hf（高频(High Frequency)）频率范围 3－30 MHz波段名称 短波波长范围 100－10 米（m）传播特性 天波与地波主要用途 远距离短波通信；国际定点通信LF (低频(low frequency))高低频划分:极低频 ELF (Extremely Low Frequency) 3-30Hz超低频 SLF (Super Low Frequency) 30-300Hz特低频 ULF (Ultra Low Frequency) 300-3000Hz甚低频 VLF (Very Low Frequency) 3-30KHz低频 LF ( Low Frequency) 30-300KHz中频 MF (Medium Frequency) 300-3MHz高频 HF (High Frequency) 3-30MHz甚高频 VHF (Very High Frequency) 30-300MHz特高频 UHF (Ultra High Frequency) 300-3000MHz超高频 SHF (Super High Frequency) 3-30GHz极高频 EHF (Extremely High Frequency) 30-300GHz
