song cuc dai <30khz song dai 30den 300k   song trung 300 den 3000k  song ngan 3 den 30m song cuc ngan 30den 300 000m

ULF 30:300hz  vat ly.

ELF 300:3000hz thong tin duoi nuoc va trong long dat

VLF 3:30k thong tin di dong tren bien

LF 30:300k thong tin di dong tren khong 

MF 300:3000k  phat thanh , thong tin hang hai

HF 3:30M thong tin di dong cac loai, thong tin quoc te, phat thanh song ngan

VHF 30:300M truyen hinh, phat thanh FM

UHF 300:3000M truyen hinh,cac loai thong tin di dong, thong tin co dinh

SHF 3:30G thong tin ve tinh va rada. vien thong cong cong, vo tuyen thien van

EHF 30:300G vo tuyen thien van,thong tin ve tinh