Difference between UHF and VHF radios
UHF vs VHF:
Today, the world is a much more complicated place than it was in the past. Even the things that cannot be seen by the naked eye are studied and explored. Radio frequencies, on which this article is based, would be a good example for that. A radio frequency is defined as a frequency or a band of frequencies in the range 104 to 1011-1012 Hz which are appropriate for use in telecommunications. Radio, in this case, is defined as the transmission and reception of electromagnetic waves of radio frequency, especially those which carry sound messages. Accordingly, UHF and VHF are two bands of radio frequencies which are consisted of electromagnetic waves. Both these types of frequencies are vastly and essentially used in telecommunication services such as radio and television broadcast services. Though these two bands are widely discussed and highly utilized, for some people those two frequency bands are difficult to be differentiated from one another. Therefore, this article intends to get to the attention on such groups by explaining what is meant by UHF and VHF and their differences.
What is UHF?
UHF, abbreviated form for Ultra High Frequency, designates the ITU (International Telecommunication Union) radio frequency range of electromagnetic waves between 300 MHz and 3000 MHz. UHF is also known as the decimeter band or decimeter wave since the length of the wave ranges from 1 to 10 decimeters. The UHF band is recognized below the SHF (Super High Frequency) and EHF (Extremely High Frequency) bands which fall into the microwave frequency range. Simply, SHF and EHF are above UHF. The VHF (Very High Frequency) band of radio frequency is what is seen below the UHF wave spectrum. Speaking of the application of UHF signals, the UHF signals are widely used for television and radio broadcast and for mobile phones. GSM networks, on which most mobile phones function, generally utilize the 900 MHz-1800 MHz band. Plus, mobile phones with 3G mobile networks use more high frequencies of the UHF band. Further, as well as UHF is used for FM radio and television broadcasts, it is globally used for land mobile radio systems for commercial, industrial, public safety, and military purposes. Moreover, UHF signals travel over line-of-sight distances. ‘Although ‘line of sight’ (where transmitter can be seen from receiving antenna without any obstacle) is not necessary, UHF waves are more attenuated than VHF waves’, it is noted. In addition, there are disadvantages of UHF. The main disadvantage is the shortness of the UHF wave. Another major disadvantage of UHF could be its restricted broadcast range and reception.
What is VHF?
VHF is found below the UHF wave spectrums. That means the VH frequency is less than UH frequency. VHF, which is the abbreviated form for Very High Frequency, is the radio frequency which ranges from 30 MHz to 300 MHz. Frequencies that are immediately below the VHF are known as HF (High Frequency). The higher band of frequency that is above the VHF is, as described previously, is the UHF. VHF is vastly used in FM radio and television broadcasts which usually use 88 MHz to 108 MHz. Further, VHF band of radio frequencies can be ideally utilized in terrestrial communication. Moreover, in VHF spectrum, ‘line-of-light’ is not necessary. Plus, compared to other lower frequencies, VHF is less affected by atmospheric noise and interference from electrical equipment. Also, compared to UHF, it is less affected by substantial objects such as buildings. Additionally, when speaking of channels, VHF may have fewer channels and a narrower range. One disadvantage of VHF is its ability to experience congestion and its potential of being interfered by other radios in the surrounding.
What is the difference between VHF and UHF radios?
Apart from the main similarity of UHF and VHF; both are types of radio frequencies mainly used for telecommunication purposes and are sub types of high frequencies. There are several distinct different features about the two bands of radio frequencies. The major difference would be that the UHF uses higher frequencies than the VHF. That is to say, when UHF designates frequencies from 300 MHz-3000 MHz, the VHF uses lower frequencies; 30 MHz-300 MHz. Also, UHF bands are much narrower than the VHF band and UHF bands carry more information. Then, another difference would be that UHF waves are more affected by attenuation than VHF waveforms, making them capable of traveling longer distances than the UHFs. Further, another disparity would be the size of the antenna. UHF antennas are shorter and smaller when compared to VHF antennas. Next, VHFs are less affected by atmospheric noise.
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