AF
CPS
EHF
HF
Hz
MF
RF
SHF
UHF
VHF
VLF
audio frequency
carrier frequency
cycles
extremely high frequency
frequency
frequency spectrum
hertz
high frequency
intermediate frequency
kilocycles
kilohertz
low frequency
lower frequencies
medium frequency
megahertz
radio frequency
spark frequency
spectrum
superhigh frequency
ultrahigh frequency
upper frequencies
very high frequency
very low frequency