主頁（http://www.130131.com）：無線電高低頻劃分

極低頻 ELF (Extremely Low Frequency) 3-30Hz

超低頻 SLF (Super Low Frequency) 30-300Hz

特低頻 ULF (Ultra Low Frequency) 300-3000Hz

甚低頻 VLF (Very Low Frequency) 3-30KHz

低頻 LF ( Low Frequency) 30-300KHz

中頻 MF (Medium Frequency) 300KHz-3MHz

高頻 HF (High Frequency) 3-30MHz

甚高頻 VHF (Very High Frequency) 30-300MHz

特高頻 UHF (Ultra High Frequency) 300-3000MHz

超高頻 SHF (Super High Frequency) 3-30GHz

極高頻 EHF (Extremely High Frequency) 30-300GHz