What is the difference between uhf and vhf?

Answer 1

For the benefit of a beginner , the typical VHF communications band is considered around 100 to 170 MHz (2 meters is 144-148 MHz and 220 is 219-225 MHz), UHF around 400 to 500 MHz (70 cm is 420-450 MHz, 33 cm is 902-928 MHz, 23 cm is 1240-1300MHz, also ham bands at 2300-2310 MHz and 2390-2450 MHz).

FM radio would be VHF (88 - 108 MHz esp. in USA, 76-108 MHz in some other parts of world (e.g. Japan))

Cellular phones operate between 820- 920 MHz (approx) and 1805-1990 MHz with more spectrum added from time to time .

When you get into 3 GHz (gigahertz or 3000 mhz) you are into microwave or RADAR frequencies .

Another spectrum is called HF (High Frequency) , from 3-30 MHz. It was called HF because in the 1930's it was as high as they could go , but the label is still used in the Amateur Radio lexicon.

From a US. Dept. of Commerce poster:

• VLF (Very Low Freq.) = 0 - 30kHz (audio)
• LF (Low Freq.) = 30 - 300 kHz (eg, Loran)
• MF (Medium Freq.) = 300kHz - 3MHz (eg, AM broadcast)
• HF (High Freq.) = 3MHz - 30MHz ("short wave")
• VHF (Very High Freq.) = 30MHz -300MHz (eg, FM broadcast, analog TV (VHF), civil aviation, analog public service)
• UHF (Ultra High Freq.) = 300MHz - 3GHz (eg, analog TV (UHF), analog cellphones)
• SHF (Super High Freq.) = 3GHz - 30GHz