(N) :
Very low frequency or VLF is the ITU designation for radio frequencies in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively.
(N) :
Very low frequency or VLF is the ITU designation for radio frequencies in the range of 3–30 kHz, corresponding to wavelengths from 100 to 10 km, respectively.