With nearly two decades of experience in radio equipment sales, service, and installation, Two Way Radio Gear understands its products and its customer base, and can help customers find the right solution for their two way radio needs. One of the biggest questions newbies have about two-way radio communication is whether they should buy UHF or VHF radios. UHF Radio Advantages In general, UHF radios are better for indoor use because their wavelengths are shorter and better able to penetrate through steel and concrete.
The government regulates these frequencies and the equipment used to communicate through them. Since people need all different types of radio signals a variety of wireless equipment is necessary to satisfy all needs. The FCC is in control of who operates within each specific band and if anyone has priority over other operators. The primary users are properly licensed radio and television broadcasters as well as commercial communication services such as cell phones and two-way radios.
Very high frequency is commonly used for FM radio broadcast, two-way land mobile radio systems, long-range data communication, and marine communications, just to name a few. VHF waves must not exceed the local radio horizon of miles. VHF frequencies are less likely to be interrupted by atmospheric noise, issues with electrical 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 wireless microphones, cordless phones, radio controlled toys and more. Despite the potential background noise this a popular option because of the low cost equipment. The primary users of this band are VHF television channels 7 - The possibility of interference from other secondary users and general RF noise exists, but it is much less likely than for low-band VHF frequencies.
In addition, although this range includes the primary users of television channels 7 - 13, there are ample frequencies available, i. The primary physical characteristic of UHF radio waves is their much shorter wavelength of 12 inches to 24 inches.
The most apparent consequence of this is the much shorter length of antennas for UHF wireless microphone systems. One less obvious consequence is reduced radio wave propagation both through the air and through other non-metallic materials, such as walls and human bodies. This results in potentially less transmitting range for comparable radiated power. Another consequence is the increased amount of radio wave reflections by smaller metal objects, resulting in comparatively more frequent and more severe interference due to multi-path dropouts.
However, diversity receivers are very effective in the UHF band and the required antenna spacing is minimal. While the regulations for users and for licensing are essentially the same in the VHF and UHF bands, regulations for the equipment allow two potential differences. This effectively permits greater deviation for potentially wider frequency range and wider dynamic range of the audio signal. In addition, transmitter power up to mW is allowed. Finally, the available radio spectrum for UHF wireless microphone system use is almost eight times greater than for high-band VHF.
This allows for a much larger number of wireless microphone systems to be operated simultaneously. In practice, the effectively greater deviation limits of UHF are not generally used because of the resulting reduction in the number of simultaneous systems that may operated: the corresponding increased occupied bandwidth of each system uses up more of the available frequency range.
Also, use of increased transmitter power is rare due to the resulting severely decreased battery life and to the increased potential of mutual system interference. However, even for UHF systems with less than the maximum limits of deviation and power, the capability for an increased number of simultaneous systems is a significant benefit in certain applications. This is especially true since UHF systems can generally be used in conjunction with VHF systems at the same location without interference.
Typically, it is more difficult and more expensive to design and manufacture UHF devices. This means that UHF frequencies have smaller waves that produce a greater range. They are more likely to pass barriers like rocks and trees easier. VHF range is reduced due to signal degradation with barriers such as trees or hills. Together they both reach a good distance. UHF uses a lot of its battery due to the higher frequency. In order to ensure your radio is compatible with existing radio systems make sure you are staying within the same frequency band.
Another way to ensure your radios are compatible is make sure the current systems are correct. The newer models should be digital, but other models may still be using analog. Lastly, you need to keep in mind that if your radios meet the certain requirements mentioned above, they still may not be compatible. If you are unsure at any time that your two radios are compatible give our partners at First Source Wireless a call and they would be happy to assist in selecting the correct two-way radio.
You can find all of Harris two-way radios on First Source Wireless. First Source provides antennas and NMO mounts for vehicles and two-way radios. Shop today for your two-way radio antennas now. With her experience, she has helped public safety professionals find the right radio frequencies for their two-way radio.
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