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  2. Antenna analyzer - Wikipedia

    en.wikipedia.org/wiki/Antenna_analyzer

    An antenna analyzer measuring SWR and complex impedance of a dummy load. MFJ-269, MFJ Enterprises Inc. An antenna analyzer or in British aerial analyser (also known as a noise bridge, RX bridge, SWR analyzer, or RF analyzer) is a device used for measuring the input impedance of antenna systems in radio electronics applications.

  3. Slow-scan television - Wikipedia

    en.wikipedia.org/wiki/Slow-scan_television

    SSTV transmissions often include station call signs, RST reception reports, and Amateur radio jargon. Slow-scan television (SSTV) is a picture transmission method, used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color. A literal term for SSTV is narrowband television.

  4. Amateur television - Wikipedia

    en.wikipedia.org/wiki/Amateur_television

    Usually used as an ATV repeater output. VSB filters must be used on this channel to keep the signal inside the ham band. Channels 58 and 59 are often offset in frequency to limit interference to the weak-signal and amateur radio satellite sub-bands (431–433 & 435–438 MHz respectively). Many modern CATV receivers can still lock-on to ...

  5. KAET - Wikipedia

    en.wikipedia.org/wiki/KAET

    KAET (channel 8), branded Arizona PBS, is a PBS member television station in Phoenix, Arizona, United States, owned by Arizona State University and operated by ASU's Walter Cronkite School of Journalism and Mass Communication.

  6. Doppler radio direction finding - Wikipedia

    en.wikipedia.org/wiki/Doppler_radio_direction...

    A common RDF antenna design is the loop antenna, which is simply a loop of wire with a small gap in the circle, typically arranged to rotate around the vertical axis with the gap at the bottom. [3] Some systems used dipole antennas instead of loops. Before the 1930s, radio signals were generally in the long wave spectrum. For effective ...

  7. Antenna measurement - Wikipedia

    en.wikipedia.org/wiki/Antenna_measurement

    Antenna directivity is the ratio of maximum radiation intensity (power per unit surface) radiated by the antenna in the maximum direction divided by the intensity radiated by a hypothetical isotropic antenna radiating the same total power as that antenna. For example, a hypothetical antenna which had a radiated pattern of a hemisphere (1/2 ...

  8. List of PBS member stations - Wikipedia

    en.wikipedia.org/wiki/List_of_PBS_member_stations

    The following is a list of affiliates of Create, a PBS sub-channel network of non-commercial educational television stations in the United States. The list is arranged alphabetically by state and based on the station's city of license and followed in parentheses by the designated market area and when different from the city of license.

  9. Near vertical incidence skywave - Wikipedia

    en.wikipedia.org/wiki/Near_Vertical_Incidence...

    Near vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the medium distances range — usually 0–650 km (0–400 miles). It is used for military and paramilitary communications, broadcasting, [ 1 ] especially in the tropics, and by radio amateurs for nearby contacts circumventing line ...

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