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Many modern CATV receivers can still lock-on to frequencies offset as much as 1 MHz. Rarely used today due to heavy FM repeater use in this range. To remain within the amateur radio bandwidth allocation, a maximum of two channels may be simultaneously used within a given geographic area, and the video carrier frequencies must be at least 12 MHz ...
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. [1]
An amateur radio net, or simply ham net, is an "on-the-air" gathering of amateur radio operators.Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a common topic of interest, in severe weather (for example, during a Skywarn activation), emergencies, or simply as a regular gathering of friends for ...
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The AARS organization continued to operate until the United States entry into World War II on 7 December 1941, at which time radio amateurs were denied the use of the airwaves, and the amateur service and the Army Amateur Radio System were deactivated. Following WWII, the US Army recognized the importance of reactivating the AARS to train ...
(a) To develop the use of personal radio services as an additional source of communications for emergencies, disasters, and as an emergency aid to individuals; [1] (b) To establish 24-hour volunteer monitoring of emergency calls, particularly over officially designated emergency frequencies, from personal radio service operators, and report such calls to appropriate emergency authorities; [1]
An SSTV repeater is an amateur radio repeater station that relays slow-scan television signals. A typical SSTV repeater is equipped with a HF or VHF transceiver and a computer with a sound card, which serves as a demodulator/modulator of SSTV signals. SSTV repeaters are used by amateur radio operators for exchanging pictures.
The RCRS service has 50 channels just for model aircraft in the 72–73 MHz range, and 30 more channels for surface models such as cars and boats in the 75.4–76 MHz range. 0.75 watts is allowed on these numbered channels. Licensed amateur radio operators can use any amateur frequency for R/C, but those enthusiasts tend to use frequencies in ...