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Communication terminology
VHF refers to radio waves with a frequency band from 30 MHz to 300 MHz.
High and low frequency division:
Extremely low frequency 3-30hz.
Ultra-low frequency SLF (ultra-low frequency) 30-0.3khz
ULF (ultra-low frequency) 300-3 khz.
Very low frequency VLF (very low frequency) 3-30KHz.
Low frequency LF (low frequency) 30-0.3MHz
Intermediate frequency MF (intermediate frequency) 300KHz-3MHz.
High frequency 3-30 MHz.
Very high frequency VHF (very high frequency) 30-300mhz.
UHF (Ultra High Frequency) 300-3 GHz.
UHF SHF (Ultra High Frequency) 3-30GHz
EHF (very high frequency) is 30-300 GHz.
Very high frequency (VHF) is mostly used in radio and television, and it is also a communication channel for aviation and navigation.
VHF is mainly used for short-distance transmission. Unlike high frequency, the ionosphere usually does not reflect VHF signals, and VHF signals are often affected by environmental factors (such as topography).
UHF and VHF are two different bands on TV.
There is also V-L, which is the three frequency bands of TV.
There are different TV programs in different bands.
Now only color TV has three frequency bands.
Only black and white, no V-L.