How to choose a two-way radio

Monday, March 21, 2011

How to choose a two-way radio

two-way radios are essentially three types: hand, base station and mobile vehicle desktop. There are also only two-way radio equipment, such as call boxes inside and outside the radio one-way paging, wireless receiver, too.

portable radios are radio-type walkie-talkies that you see people carrying around. As the (Federal Communications Commission) FCC, wireless handheld can not exceed 5 wattsPower.

Two Way Radios

Vehicle-mounted mobile radios installed in a car or truck and use the car battery for power. They can make their antenna, but better range is achieved using an external antenna.

How to choose a two-way radio

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Desktop radio base station using the power outlet and they have a built-in antenna, but this antenna can be connected and then connected to cable, which is mounted to an external antenna. The higher the antenna is mounted, the better the range. L 'Mobile base stations mounted on the vehicle normally used with just an AC / DC.

Mobile radio base station and are usually more powerful than portable radios and can have up to 100 watts of power.

UHF or VHF

There are two main formats for wireless devices. They are Ultra High Frequency (UHF) radio and high frequency (VHF) radio. No frequency band is intrinsically better than others. They have their advantages and disadvantages. BothSizes are effective ways to communicate to another person with the decision depends on the radio right for you from your application.

The lower frequencies or wavelengths have a greater impact. This is one reason they are used to communicate with submarines. VLF radio waves (3-30 kHz) can penetrate sea water to a depth of 20 meters. So a submarine in shallow water, these frequencies.

So from what you read, you can think of VHF is still the bestElection of a two-way radio, no matter where you use it. This is not necessarily true. Although VHF penetrate better skills do not necessarily make it a better choice to build. The wavelength of a radio frequency has a significant impact on the air.

To explain this, assume we are on one side of an office building of communication with others. Between these two points, a metal wall with a door three feet in it. The metal is an enemy of radio wavesand usually does not go through.

For our example, suppose that the wavelength of the UHF radio consumes about a foot long and a half, like an FM radio is around five meters long. These are in the ballpark of their normal wavelength.

If the UHF signals of his foot and a half along a shaft through the door as the door to go well in that wavelength. The FM signal is reflected totally because it is more wide open the door.

TheirMicrowave is an example. The glass door is a metal mesh with tiny holes. Microwave wavelengths as the high frequency that are only a few centimeters in length. The network has captured the microwave oven, but allows you to see inside because light waves have a wavelength microscopic.

Imagine walking through the construction of a five poles meters wide. We face the same challenges a VHF signal encounters. Now, you are through, walkBuilding with a bar that only about half a meter wide as a wave UHF. There are a lot less you could not go door openings.

The only difference is that radio signals are plasterboard, masonry, human bodies, furniture, wall covering and penetrate other solid objects. All these items will reduce the signal strength though. The more the object, the smaller the signal. VHF penetrate these obstacles better than UHF, but that does not necessarily mean that VHFbest for indoor applications.

In our example above we have assumed that it was a metal wall with an opening. If this is reversed and you have a three-foot metal object against the transfer of the radio, then VHF would win. Since the object is three feet wide, is completely block the signal in the UHF FM signal is to get it. The lower frequencies such as VHF around large smooth obstacles more easily bend, and also to travel more easily through brick and stone.

For mostThe applications are the lower frequencies better than long-haul. A television broadcast station illustrates this. A typical VHF uses about 100,000 watts and has a range radius of about 60 miles. A UHF transmitter with 60-mile coverage radius requires three million watts of transmission.

So there is no clear choice for the best, VHF or UHF. There are a lot of "Black Magic" on radio technology in a way that is not always easy to say which is better for your workApplication.

The other thing you need to do is decide if you will not get an FCC license or want. If you buy a radio for your business, most business-band radios require a license from the FCC before they can use the radio. Business will need to use the VHF and UHF all licensed FCC.

One exception is if you buy the radios in the frequency Murs. You can radios in the unlicensed MURS VHF 151.8200 154.6000 purchase, thedoes not need a license. If it does not require a license 151.6250 154.6550 VHF and Business license 461.0375 469.5625 MHz UHF range of activities for granted.

To help you with the best radio for your application, more details on these decisions can be found in a book entitled "Two Way Radio success. How to choose radio, commercial telephones, and other communications equipment for your business" on Google only term "two-way radio success" and you will find.

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