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In most countries of the world, people can obtain government-issued licenses to send and receive messages via radio for nonprofessional purposes. In America, this hobby is called amateur radio or ham radio. If you want only to listen to communications and broadcasting, and not to transmit signals, you do not need a license in the United States (although you might need one in certain other countries).
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Anyone can use ham radio. Amateur radio operators, often called radio hams, can communicate using any of numerous modes, including speech, Morse code, television, and radioteletype (RTTY). This last mode, RTTY, can be done in real time, or by posting messages in a manner similar to the way computer users exchange information by electronic mail (e-mail). Radio hams have set up their own radio networks. Some of these networks have Internet gateways. This is known as packet radio. Some radio hams chat about anything they can think of (except business matters, which are illegal to discuss via ham radio). Others like to practice emergency-communications skills, so they can be of public service during crises such as hurricanes, earthquakes, or floods. Still others like to go out into the wilderness and talk to people thousands of miles away while sitting out under the stars. Amateur radio operators communicate from cars, boats, aircraft, and bicycles; this is called mobile operation. When transceivers are used while walking or hiking, it is known as portable or handheld operation.
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A simple ham radio station has a transceiver (transmitter/receiver), a microphone, and an antenna. A small station can fit on a desktop and is about the size of a home
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618 Wireless and personal communications systems computer or hi-fi stereo system. Accessories can be added until a ham rig is a large installation, comparable to a small commercial broadcast station. Figure 32-8 shows an example of a fixed, computer-controlled amateur radio station. The PC can be used to communicate via packet radio with other hams who own
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VHF/UHF transceiver
HF transceiver
Printer
Computer
Video camera
To all units
Power supplies
To utility mains
32-8 A computer-controlled amateur radio station.
computers. The station can be equipped for on-line telephone (landline) services. The PC can control the antennas for the station and can keep a log of all stations that have been contacted. Some transceivers can be operated by computer, either locally or by remote control over the radio or landline. A good way to learn about ham radio is to contact the headquarters of the American Radio Relay League, 225 Main Street, Newington, CT 06111. Their Web site is at http://www.arrl.org.
Shortwave listening
The high-frequency (HF) portion of the radio spectrum, at frequencies between 3 and 30 MHz, is sometimes called shortwave. This is a misnomer by contemporary standards; the waves are long compared with microwaves (a few millimeters) or IR (a tiny fraction of one millimeter), which are commonly used in wireless devices. A frequency of 3 MHz corresponds to a wavelength of 100 meters in free space; 30 MHz corresponds to 10 meters. But in the early years of radio when the shortwave band got its name, the wavelengths between 3 and 30 MHz were short compared with the
Noise 619 wavelengths of most broadcast and communications signals, which had wavelengths in the kilometer range. Anyone can build or obtain a shortwave or general-coverage radio receiver, install a modest outdoor antenna, and listen to signals from all around the world. This hobby is called shortwave listening or SWLing. In the United States, the proliferation of computers and on-line communications has, to some extent, overshadowed SWLing, and many young people grow up today ignorant of a realm of broadcasting and communications that still predominates in much of the world. But some people are still fascinated by the idea that people can contact each other by wireless devices without the need for any human-made infrastructure other than an antenna at the source and another antenna at the destination. The ionosphere returns shortwave signals to the earth s surface and allows reliable global broadcasting and communication to take place today, just as it always has, and just as it always will. There are various commercially manufactured shortwave receivers on the market today, and some of these are inexpensive. An outdoor wire antenna costs practically nothing. Most electronics stores carry one or more models of shortwave receiver, along with antenna equipment, for a complete installation. One problem with low-priced shortwave receivers is that they usually lack the mode flexibility, selectivity, and sensitivity necessary to engage in serious SWLing. If you are interested in this hobby and want to obtain high-end equipment, shop around in consumer electronics and amateur radio magazines. Most electronics and book stores carry periodicals and books for the beginner as well as the experienced SWLer. A library can also be a good source of information, especially if you are interested in antique shortwave receivers, some of which can be found at amateur-radio conventions and flea markets.
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