All wireless communication systems, including cell phones and two-way radios, operate on what is known as operate frequency. The government regulates these frequencies and the equipment used to communicate through them. Since people need all unlike types of radio signals a diverseness of wireless equipment is necessity to satisfy all needs .
In the United States, the Federal Communication Commission ( FCC ) regulates the radio frequency bands. According to US frequency groups there are four different categories : low-band VHF ( 49-108 MHz ), high-band VHF ( 169-216 MHz ), low-band UHF ( 450-806 MHz ), and high-band UHF ( 900-952 MHz ) .
The FCC is in control of who operates within each specific band and if anyone has priority over other operators. The primary users are by rights licensed radio and television broadcasters vitamin a well as commercial communication services such as cellular telephone phones and bipartisan radios.
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VHF and UHF each include their own alone benefits and drawbacks .
VHF- Very High Frequency
very high frequency is normally used for FM radio broadcast, two-way land mobile radio receiver systems, long-range data communication, and marine communications, precisely to name a few. VHF includes radio waves from 30 MHz to 300 MHz .
VHF waves must not exceed the local radio horizon of 100 miles. VHF frequencies are less likely to be interrupted by atmospheric noise, issues with electric equipment, and other interferences .
There are different bands within VHF frequency, including low-band and high-band. Low-band VHF range of 49 MHz includes transmission of radio microphones, cordless phones, radio controlled toys and more. slenderly higher VHF range of 54-72 MHz operates television channels 2-4, vitamin a well as radio systems defined as “ assistive listening. ” VHF frequencies 76-88 MHz operate channels 5 and 6. The highest low band VHF is 88-108 MHz and operates the commercial FM radiobroadcast band .
With so many different users the low-band VHF is not recommended for manipulation of serious applications due to the levels of radio “ make noise ” present at these frequencies. Despite the electric potential background make noise this a popular option because of the low monetary value equipment. Transmission world power is limited to under 50 mW, unless you are operating an assistive listening system in the 72-76 MHz range. besides, a big antenna booster is necessary, measuring deoxyadenosine monophosphate much as 3 feet in length, therefore limiting portability .
High-band VHF range is popular for professional applications. The lowest high-band ( 169- 172 MHz ) includes 8 different frequencies designated by the FCC, and is much used by the general populace and radio receiver microphone devices. These frequencies are known as “ traveling frequencies ” because they can be used all around the US without fear of noise from broadcast television receiver. Power is limited to 50 mW, although antenna size is smaller ( around 20 inches per ¼ wavelength type ). Businesses, government operations and the Coast Guard engage on this “ traveling ” band. For best results you typically lone want to operate two to three units on this frequency.
The high-band VHF between 174 and 216 MHz is used for VHF television channels 7-13. High quality audio is possible equally well as smaller antenna size, depressed to 14 inches or less. The same 50 mW ability restrictions apply .
Low-band VHF frequencies are far more probably to incur interferences than high-band VHF frequencies. ( Reference )
UHF- Ultra High Frequency
UHF radio waves are much shorter in distance than VHF, measuring approximately 12 to 24 inches. As a result antenna duration is reduced ampere well as radio range. Anything from a build to a human body can interfere with UHF transmissions. Dropouts and interferences are far more probably, but greater bandwidth occupation is permitted. As a result you may find a wide frequency stove a well as wide range of audio signal. Up to 250 mW is allowed, exceeding the 50 mW power restrictions applied to VHF .
Low-band UHF overlaps with high-band UHF, low is 450-536 MHz and high is 470-806 MHz. Typically, commercial enterprise services and UHF television receiver channels 14 through 69 manoeuver using these frequencies. High-band UHF ( anything above 900 MHz ) offers the least come of disturbances and requires antennas measuring between 3 and 4 inches. These channels operate studio-to-transmitter links vitamin a well as other chief users and extra channels .
UHF radio waves by and large alone go angstrom far as tune of sight. Anything in the way of your sight will besides interfere with frequency range, such as buildings, tall trees or any other obstruction. The transmission is high adequate to penetrate through build walls, making indoor reception a possibility. It is the limited line-of-sight broadcast range that makes UHF unsuitable in some instances. VHF offers a a lot larger air range, which is preferred in some industries .
UHF radio signals are used in many facets of animation including satellite communication, GPS, Wi-Fi, Bluetooth, walkie-talkies, cordless phones, cellular telephone phones, and television receiver circulate.
A boastfully advantage of UHF transmittance is the abruptly wavelengths produced by the eminent frequency. The size of the radio wave relates directly to the distance of transmittance ampere well as the reception antenna. In general, UHF antennas are light and across-the-board .
The cost of operating UHF equipment outweighs the operation of VHF equipment. This is because it is more work to create UHF compatible devices based on the ways high frequency and brusque wavelength radio signals interact together. The deviation in cost largely relates to the need for antennas, cables and other extra equipment .
Need help identifying the best radio frequency for your needs ? Contact Highland Wireless today and talk with lead experts regarding bipartisan radio technology .