Amateur Radio Handbook

Amateur radio - Amateur radio, often called ham radio, is a hobby enjoyed by many people throughout the world. An amateur radio operator, ham, or radio amateur uses two-way radio to communicate with other radio amateurs for public service, recreation and self-improvement.

Amateur radio station - An amateur radio station is a facility equipped with the apparatus necessary for carrying on radiocommunications in the Amateur Radio Service. There are several types of amateur radio stations: an amateur radio station may be located in a building, installed in a vehicle, located in space, or established in a temporary field location.

Radio Amateur Civil Emergency Service - RACES (Radio Amateur Civil Emergency Service) is provided for in Part 97 of the FCC rules and regulations governing amateur radio in the United States. RACES members, volunteer Amateur Radio Operators, operate on behalf of a public agency during a declared emergency, including natural and man-made hazardous situations.

Amateur Radio Direction Finding - Amateur Radio Direction Finding is an amateur map and compass sport that combines the skills of orienteering and radio direction finding. It is a timed race in which individual competitors use a topographic map and a magnetic compass to navigate through diverse wooded terrain while searching for radio transmitters.

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The repeater devices generally use the VHF and UHF frequency bands and operate using line-of-sight propogation from the tops of mountains, tall buildings and towers, giving small mobile and handheld radios radio coverage for hundreds of miles. A repeater can repeat on the same band, but either the transmitting antenna and receiving antenna must be widely separated, or a high decibel filter system such as a series of cavity filters must be widely separated, or a high decibel filter system such as a series of cavity filters must be used to both block and pass the receception and transmission frequencies for their respective parts of the repeater. Heterodyne repeater Heterodyne repeater or cross band repeater. Synonym IF repeater. Note: Heterodyne repeaters are used, for example, in microwave systems, to avoid undesired feedback between the receiving and transmitting antennas. Source: from Federal Standard 1037C and from MIL-STD-188 See the repeater chapter in The ARRL Handbook for details. The repeater devices generally use the VHF and UHF frequency bands and operate using line-of-sight propogation from the tops of mountains, tall buildings and towers, giving small mobile and handheld radios radio coverage for hundreds of miles. A repeater can repeat on the same band, but either the transmitting antenna and receiving antenna must be widely separated, or a high decibel filter system such as a series of cavity filters must be used to both block and pass the receception and transmission frequencies for their respective parts of the repeater. Heterodyne repeater or cross band repeater: In radio reception and retransmission, a repeater that converts the original band of frequencies of the repeater. Heterodyne repeater Heterodyne repeater Heterodyne repeater Heterodyne repeater Heterodyne repeater or cross band repeater. Synonym IF repeater. Note: Heterodyne repeaters are used, for example, in microwave systems, to avoid undesired feedback between the receiving and transmitting antennas. Source: from Federal Standard 1037C and from MIL-STD-188 See the repeater chapter in The ARRL Handbook for details. The repeater devices generally use the VHF and UHF frequency bands and operate using line-of-sight propogation from the tops of mountains, tall buildings and towers, amateur radio handbook.