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  2. Antenna rotator - Wikipedia

    en.wikipedia.org/wiki/Antenna_rotator

    An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...

  3. Antenna tuner - Wikipedia

    en.wikipedia.org/wiki/Antenna_tuner

    An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), antenna coupler, or feedline coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna's feedline. Antenna tuners are particularly important for use with ...

  4. Yaesu FT-817 - Wikipedia

    en.wikipedia.org/wiki/Yaesu_FT-817

    [1] [2] With internal battery pack, on board keyer, its all mode/all band capability and flexible antenna, the set is particularly well suited for portable use. The FT-817 is based on a similar circuit architecture as Yaesu's FT-857 and FT-897, so it is a compromise transceiver and incorporates its features to its low price ($670.- at its 2001 ...

  5. QSK operation (full break-in) - Wikipedia

    en.wikipedia.org/wiki/QSK_operation_(full_break-in)

    Enormous signal level ranges must be accommodated by radio transceiver equipment. Transmitter output power for amateur radio stations might typically be 100 watts (+50 dBm) or more, while received power at radio receiver antenna input terminals might typically be as low as −130 dBm. This range of signal power that must be handled by various ...

  6. Duplexer - Wikipedia

    en.wikipedia.org/wiki/Duplexer

    In radar, a transmit/receive (TR) switch alternately connects the transmitter and receiver to a shared antenna. In the simplest arrangement, the switch consists of a gas-discharge tube across the input terminals of the receiver. When the transmitter is active, the resulting high voltage causes the tube to conduct, shorting together the receiver ...

  7. Diplexer - Wikipedia

    en.wikipedia.org/wiki/Diplexer

    The dish antenna occupies the high frequencies (typically 950 to 1450 MHz), and the TV antenna uses lower television channel frequencies (typically 50 to 870 MHz). In addition, the satellite also gets a DC to low frequency band to power the dish's block converter and select the dish antenna polarization (e.g., voltage signaling or DiSEqC ).

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