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  2. 15-meter band - Wikipedia

    en.wikipedia.org/wiki/15-meter_band

    The 15-meter band (also called the 21-MHz band or 15 meters) is an amateur radio frequency band spanning the shortwave spectrum from 21 to 21.45 MHz. The band is suitable for amateur long-distance communications, and such use is permitted in nearly all countries.

  3. The 7 Best HDTV Antenna Amplifiers of 2023 For a Better Signal

    www.aol.com/lifestyle/best-high-definition-tv...

    LNA-100 Boost Antenna Amplifier. If you’re looking for an antenna amplifier that's easy to set up and minimizes wires in your house, the Winegard LNA-100 Boost is an ideal choice.

  4. Antenna amplifier - Wikipedia

    en.wikipedia.org/wiki/Antenna_amplifier

    In electronics, an antenna amplifier (also: aerial amplifier or booster) is a device that amplifies an antenna signal, usually into an output with the same impedance as the input impedance. Typically 75 ohm for coaxial cable and 300 ohm for twin-lead cable. An antenna amplifier boosts a radio signal considerably for devices that receive radio ...

  5. Shortwave bands - Wikipedia

    en.wikipedia.org/wiki/Shortwave_bands

    Shortwave bands are frequency allocations for use within the shortwave radio spectrum (the upper medium frequency [MF] band and all of the high frequency [HF] band). Radio waves in these frequency ranges can be used for very long distance (transcontinental) communication because they can reflect off layers of charged particles in the ionosphere and return to Earth beyond the horizon, a ...

  6. Cellular repeater - Wikipedia

    en.wikipedia.org/wiki/Cellular_repeater

    A cellular repeater (also known as cell phone signal booster or cell phone signal amplifier) is a type of bi-directional amplifier used to improve cell phone reception. [citation needed] A cellular repeater system commonly consists of a donor antenna that receives and transmits signal from nearby cell towers, coaxial cables, a signal amplifier, and an indoor rebroadcast antenna.

  7. Moxon antenna - Wikipedia

    en.wikipedia.org/wiki/Moxon_antenna

    Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]

  8. Signals intelligence operational platforms by nation - Wikipedia

    en.wikipedia.org/wiki/Signals_intelligence...

    The other antennas, a 15m radome and seven uncovered smaller dishes, are intended for the fully automated US naval Mobile User Objective System, a new 'next generation' narrowband networked satellite constellation for Ultra-High-Frequency satellite communications enabling secure all-weather and all-terrain 3 and 4G mobile telecommunications.

  9. Manfred Memorial Moon Mission - Wikipedia

    en.wikipedia.org/wiki/Manfred_Memorial_Moon_Mission

    The radio payload consisted of a quarter-wave monopole antenna supported by an I/Q modulator, and an RF power amplifier providing 1.5 W power. [ 9 ] [ 11 ] The probe's antenna transmitted up to 2,500, 13-character digital messages at 145.980 MHz using digital mode JT65B , with additional tone transmissions .

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