Noun
VLF (uncountable)
(electronics) Initialism of very low frequency.
Common carrier shifts are 85 Hz (used on LF and VLF frequencies), 170 Hz, 425 Hz, 450 Hz and 850 Hz, although some stations use non-standard shifts. Source: Internet
Some types of transmitting antenna systems in the VLF, LF, MF and lower SW range must have a good ground to operate efficiently. Source: Internet
The VLF and LF frequencies are mostly used for military communications, especially with ships and submarines. Source: Internet
Very low frequency Very low frequency (VLF) refers to a frequency range of 30 Hz to 3 kHz which corresponds to wavelengths of 100,000 to 10,000 meters respectively. Source: Internet