UHF And VHF

 

UHF And VHF

Wireless communication works on frequency/bandwidth, but due to variations in applications and equipment, various protocols are established to meet the system's needs. Ultra-High Frequency (UHF) and Very-High Frequency (VHF) are two commonly used protocols in wireless communication foe indoor and outdoor two-way communication. The following are some of the features and specifications in which the two protocols vary.

 

Ultra-High Frequency (UHF)	Very-High Frequency (VHF)
In US, the FCC regulatory has grouped this class as low band UHF (450-806MHz) and high band UHF (900-952MHz).	VHF classified by FCC has low band VHF (49-108MHz) and high band VHF (169-216MHz).
UHF bandwidth, in general, ranges from 300MHz to 3GHz range.	VHF hand in general has a bandwidth range of 30Mhz to 300MHz.
UHF due to their short wavelength needs not to be in Line of Sight (LOS) since they are good at penetrating through solid structures.	VHF is used in a wide area with very few interference structures and communicates better in Line of Sight (LOS).
With higher power applications, transmission power may be up to 250mW and the wavelength is much shorter from 12 inches to 24 inches.	Power is limited below 50mW and the antenna size is small as the wavelength is between 9 feet to 20 feet.
Less susceptible to noise in general.	Highly susceptible to noise but is likely to be less in the lower bandwidth range of 40-50MHz.
UHF is more preferred for indoor communication but comes at the cost of expensive equipment.	VHF is mostly used in rural areas, and the equipment cost is relatively cheaper.
They are used for indoor applications since it has high penetration power and can easily go through concrete walls and steel structures.	VHF is exclusively used for outdoor purposes since it can travel large distances but doesn’t have high penetration power.
Satellite communication, GPS, Wi-Fi, Bluetooth, walkie-talkies, cordless phones are operated on UHF.	FM Radio broadcasts, microphones, cordless cellular devices, listening systems and television broadcasting are some general applications that use VHF.