Radio Equipment and Antenna Characteristics
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Questions and Answers

What is the purpose of the transformer rectifier unit (TRU) in an airborne HF communication system?

  • To convert AC output to DC power (correct)
  • To amplify the carrier wave
  • To detect HF radio waves
  • To modulate the signal wave

    • What determines the resonant frequency of an antenna?

  • The power of the transmission signal
  • The frequency of the carrier wave
  • The length of the antenna element (correct)
  • The type of antenna used

    • What is the purpose of the antenna tuner in the airborne HF communication system?

  • To detect the signal wave
  • To amplify the transmission signal
  • To modulate the carrier wave
  • To adjust the resonant frequency and perform impedance matching (correct)

    • What type of antenna is used for VHF and UHF equipment?

    <p>Yagi antenna, Sleeve antenna, and Brown antenna</p> Signup and view all the answers

    What is the function of the side tone circuit in an airborne HF communication system?

    <p>To allow pilots to monitor their own transmission</p> Signup and view all the answers

    What is the frequency range of the airport surface detection equipment (ASDE)?

    <p>SHF</p> Signup and view all the answers

    What is the capability of mode S in a secondary surveillance radar (SSR) system?

    <p>Addressing a single specific aircraft with its unique mode-S address</p> Signup and view all the answers

    What is the frequency range of a VOR (VHF Omnidirectional Range)?

    <p>VHF</p> Signup and view all the answers

    Study Notes

    Radio Equipment Power

    • Radio equipment requires DC power to operate.

    Transformer Rectifier Unit (TRU)

    • AC output of the engine driven generator is converted to DC by the TRU.
    • TRU consists of a transformer, a rectifier, and a smoothing circuit.

    Antenna Characteristics

    • The resonant frequency of an antenna is determined by the antenna element length.
    • The antenna's characteristic (resonant) frequency is electrically adjustable.
    • Insertion of coils in antenna elements lowers the resonant frequency.
    • Insertion of capacitors makes the resonant frequency higher.

    Antenna Tuner

    • Airborne HF communication system has an antenna tuner in the antenna circuit.
    • The antenna tuner adjusts the resonant frequency and performs impedance matching.

    Antenna Types

    • Sleeve antenna, Brown antenna, and Yagi antenna are used for VHF and UHF equipment.
    • Yagi antenna is a directional antenna.

    Ionosphere and HF Communication

    • The F layer in the ionosphere reflects HF radio waves.
    • HF communication quality can be deteriorated by magnetic storm, Dellinger phenomenon, and fading depending on the strength of Sun's activity.

    Radio Wave Transmission

    • A carrier wave is generated by an oscillator.
    • The carrier wave is modulated with a signal wave (audio), and the modulated carrier wave is amplified to the required power for transmission.

    Side Tone Circuit

    • The side tone circuit allows pilots to monitor their own transmission.
    • Transmission signal is partially fed back to the receiving system for this purpose.

    Radar Frequencies

    • Detection capability of a high-frequency microwave is excellent, but its attenuation is high.
    • The airport surface detection equipment (ASDE) operates on SHF (Super High Frequency).
    • The air route surveillance radar (ARSR) and the airport surveillance radar (ASR) operate on UHF.

    SSR Modes

    • SSR mode A is capable of discriminating a "squawk" code selected on the aircraft's transponder panel.
    • Mode C has a capability of automatic altitude reporting.
    • Mode S is capable of addressing a single specific aircraft with its unique mode-S address.
    • VOR operates on VHF, providing excellent accuracy of bearing but with limited coverage to line of sight.
    • DME is commonly co-located at VOR stations to provide aircraft with bearing and distance information.
    • RNAV routes are established along waypoints based on the bearing and distance information from VOR/DME.

    ILS Components

    • Basic ILS components are a localizer for lateral guidance, a glide slope for vertical guidance, and marker beacons for position information.

    MTSAT and Satellite-Based Augmentation System

    • MTSAT provided SBAS (Satellite-Based Augmentation System) for improved accuracy and reliability of GPS navigation.
    • MTSAT also provided Controller Pilot Data-Link Communication (CPDLC) and Automatic Dependent Surveillance (ADS) for oceanic flights.
    • SBAS function is being transferred to QSS (Quasi-Zenith Satellite System).

    INMARSAT Communication

    • The quality and coverage of communication by INMARSAT are much better than HF voice communication, except in polar regions.

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    Description

    Quiz about radio equipment power sources and antenna properties, including resonant frequency and adjustments.

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