The two major wavelengths used in vehicle to vehicle, or vehicle to base communications are VHF (Very High Frequency) and UHF (Ultra High Frequency). High-band UHF (anything above 900 MHz) offers the least amount of disturbances and requires antennas measuring between 3 and 4 inches. The UHF/VHF bands were the first designated public safety bands. and radio frequency band like VHF, the higher range of frequency by UHF gives more options to bypass signal interference. It has many sub frequency bands, some are restricted and assigned only for particular applications. The band is sometimes subdivided into VHF-Lo (channels 2-6), and VHF-Hi (channels 7-13).

The Commission licenses the frequencies in these bands on a site-by-site basis, using frequency coordination to maximize frequency re-use.

Public safety channels are available in the VHF band, 220 MHz band, UHF, T-Band (licensing freeze in effect), 700 MHz narrowband, 700 MHz broadband, 800 MHz band, 4.9 GHz, and 5.9 GHz bands, as follows:

The VHF band has 12 RF channels (2-13).
Wireless UHF systems have dominated the industry in recent years.
VHF & UHF bands. The UHF band originally had 70 RF channels (14-83). The differences between these bands may not seem that important, but when you have an incident that requires emergency communication, the last thing you need to worry about is your radio’s range. Low-band UHF overlaps with high-band UHF, low is 450-536 MHz and high is 470-806 MHz. Frequencies of 1 GHz and above are also called microwave, and frequencies ranging from 1–6 GHz are often said to … It begins from 300 MHz to 3 GHz and extremely complicated to design and implement the system. In addition other propagating mechanisms … UHF band is sandwiched between VHF and SHF (Super High Frequency) bands in spectrum. Ultra High Frequency (UHF) Ultra high frequency is the most important frequency bands for modern wireless communication systems. Although UHF systems still operate in the T.V. UHF in the 470-608 MHZ (Most Analog Wireless) UHF (Ultra High Frequency) wireless microphone and instrument systems are of much higher quality than VHF. UHF Advantages . • Frequency: allocations authorised for RFID applications, specifically within the 860 to 960 MHz band of the UHF spectrum • Power: maximum wattage allowed for RFID, calculated as ERP (Effective Radiated Power) or EIRP (Equivalent Isotropic Radiated Power) A television Radio Frequency (RF) channel is allocated 6 MHz of bandwidth for over-the-air transmission in the VHF or UHF frequency band.

These systems have a much bigger range of frequency. GSM networks usually utilize the 900MHz – 1800 MHz band.

Public safety spectrum also serves the public safety-related telecommunications needs of state and local governments generally. These bands also contain the T-band, frequencies allocated for land mobile communications operations in eleven urban areas in the United States. One important difference is the RF range in which they are engineered to function: UHF or VHF. The VHF (Very High Frequency) band runs from 49 MHz to 216 MHz. The UHF band has a frequency range of 300 MHz to 3 GHz, and is used for everything from TV broadcasting and GPS to Wi-Fi, cordless phones, and Bluetooth. UHF waves are mostly used for television broadcast and mobile phones. 3G mobile networks use more high frequencies of the UHF band. This is an interesting part of the radio spectrum, where both ionospheric and tropospheric propagation occurs at the lower VHF bands to entirely tropospheric propagation on the higher band. Beginning at 300 MHz and extending to 3 GHz is the UHF (Ultra High Frequency) band. Typically, business services and UHF television channels 14 through 69 operate using these frequencies.


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