Radio Wave Properties and Characteristics
45 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which ILS indicator indicates an aircraft on final approach left of the center line and at maximum safe deviation below the glide path?

  • A needle pointing towards the left of the center line
  • A vertical needle deflected half scale down (correct)
  • A full scale deflected needle above the center line
  • A centered needle with no deflection

    • What will an aircraft receive when tracking to intercept the ILS localizer inbound on the approach side but outside the published coverage angle?

  • False on-course or reverse sense signals (correct)
  • Intermittent and correct signals
  • Consistent strong signals
  • Debilitating signals with no flag indications

    • What is the maximum safe 'FLY UP' indication on a 5 dot CDI?

  • 3 dots fly up
  • 1.5 dots fly up
  • 2.5 dots fly up (correct)
  • 4 dots fly up

    • Which factor determines the maximum range of a radar?

    <p>Pulse repetition rate</p> Signup and view all the answers

    If the PRF of a primary radar is 500 pulses per second, what will be its maximum range?

    <p>324 nm</p> Signup and view all the answers

    To double the range of a primary radar, by what factor must the power be increased?

    <p>4</p> Signup and view all the answers

    What is the range of a target if the time between pulse transmission and echo reception is 1720 microseconds?

    <p>278 km</p> Signup and view all the answers

    What is the maximum PRF required to achieve a radar range of 100 nm?

    <p>810 pps</p> Signup and view all the answers

    What does the term 'pseudo-range' refer to in the context of GNSS?

    <p>A range calculation not yet corrected for receiver and satellite clock errors</p> Signup and view all the answers

    Which method is employed to transmit navigation and system data messages in GNSS?

    <p>Using C/A and P PRN codes</p> Signup and view all the answers

    In a non-precision approach using GNSS, how is the Minimum Descent Altitude (MDA) determined?

    <p>Using either barometric or radio altimeter altitude</p> Signup and view all the answers

    What happens to the accuracy when an aircraft's maneuver causes a satellite to enter the wing shadow?

    <p>The accuracy is temporarily downgraded</p> Signup and view all the answers

    Which statement regarding NAVSTAR/GPS time is accurate?

    <p>Satellite time is correlated with UTC</p> Signup and view all the answers

    What should the pilot set on the OBS to home to the VOR on the 030 radial?

    <p>210</p> Signup and view all the answers

    What type of emission is radiated by a VOR beacon?

    <p>A double channel VHF carrier with amplitude and frequency modulation.</p> Signup and view all the answers

    If an aircraft wishes to track towards a VCR along the 274 radial with a variation of 10° W, what should be set on the OBS?

    <p>264</p> Signup and view all the answers

    An aircraft is tracking away from a VCR on a heading of 287°M with 14" starboard drift and 6°W variation. What is the phase difference of the VOR transmission?

    <p>301°</p> Signup and view all the answers

    What is the theoretical maximum range for a pilot flying at 18,000 feet from a VCR at 900 feet above mean sea level?

    <p>205 nm</p> Signup and view all the answers

    If an aircraft is on the 152 radial and has set 329 on the OBS, what will the deviation indicator show?

    <p>One and a half dots fly right.</p> Signup and view all the answers

    If a VOR receiver measures the phase difference as 220°, on which radial is the aircraft located?

    <p>220</p> Signup and view all the answers

    To convert RMI bearings of NDBs and VORs to true bearings, which combination for magnetic variation should be used?

    <p>NDB aircraft position, VOR aircraft position.</p> Signup and view all the answers

    Which of these statements about ionization levels is correct?

    <p>Ionization levels increase with increasing altitude.</p> Signup and view all the answers

    What is the average height of the E-layer and the maximum range for skywave?

    <p>125 km, 2200 km</p> Signup and view all the answers

    Which statement regarding HF communications is correct?

    <p>The frequency required is dependent on both time of day and season.</p> Signup and view all the answers

    What is the bandwidth produced when a radio frequency of 4716 kHz is amplitude modulated with an audio frequency of 6 kHz?

    <p>12 kHz</p> Signup and view all the answers

    Which statement about amplitude modulation (AM) is correct?

    <p>The amplitude of the RF is modified by the amplitude of the AF.</p> Signup and view all the answers

    What is one advantage of single sideband (SSB) emissions?

    <p>Reduced power requirement</p> Signup and view all the answers

    In frequency modulation (FM), which statement is accurate?

    <p>The frequency of the RF is modified by the frequency of the AF.</p> Signup and view all the answers

    What is the ideal length for a Marconi aerial for a frequency of 406 MHz?

    <p>36.9 cm</p> Signup and view all the answers

    What does the NAVSTAR/GPS control segment consist of?

    <p>The space segment, the user segment and the ground segment</p> Signup and view all the answers

    What is the orbital height and inclination of the NAVSTAR/GPS constellation?

    <p>20180 km, 65°</p> Signup and view all the answers

    How many satellites comprise the NAVSTAR/GPS operational constellation?

    <p>24</p> Signup and view all the answers

    What is the minimum number of satellites required for a 3D fix?

    <p>4</p> Signup and view all the answers

    What is the primary purpose of the pseudo-random noise codes in NAVSTAR/GPS?

    <p>Identify the satellites</p> Signup and view all the answers

    What is the most significant error associated with GNSS?

    <p>GDOP (geometric dilution of precision)</p> Signup and view all the answers

    What is the frequency allocated for non-authorized users of NAVSTAR/GPS?

    <p>1575.42 MHz</p> Signup and view all the answers

    If a receiver needs to download the almanac, what will be the approximate time required?

    <p>25 minutes</p> Signup and view all the answers

    What altitude are the tops of the clouds at if the radar detects a cloud at 60 nm and the tilt is selected to 2° UP with a beamwidth of 6°?

    <p>43,000 ft</p> Signup and view all the answers

    Which of the following sequences correctly represents the special SSR codes for emergency and other situations?

    <p>7700; 7600; 7500; 2000</p> Signup and view all the answers

    Secondary Surveillance Radar is a form of __________ radar with __________ type emissions operating in the __________ band.

    <p>secondary; pulse; UHF</p> Signup and view all the answers

    What happens when the SSR transponder IDENT button is pressed?

    <p>An identification pulse is automatically and continuously transmitted for 20 seconds, 4.35μ sec after the last framing pulse.</p> Signup and view all the answers

    When using SSR, what discrepancy in altitude will prompt the ground controller to ask the pilot to cancel mode C?

    <p>300 ft 1013 HPa</p> Signup and view all the answers

    When setting the SSR code for inbound or crossing flight with no other 'squawk' allocated, what should the code be?

    <p>2000</p> Signup and view all the answers

    What is required for secondary radars to function correctly?

    <p>A target which will respond to the interrogation, and this target may be either an aircraft or a ground based transponder.</p> Signup and view all the answers

    How does airborne DME equipment differentiate between its own pulses and those intended for other aircraft?

    <p>By analyzing the timing of the received pulses.</p> Signup and view all the answers

    Study Notes

    Radio Wave Properties

    • Radio waves are energy waves with an electrical field perpendicular to a magnetic field.
    • The speed of radio waves is 300 million meters per second.

    Polarization of Electromagnetic Waves

    • The plane of polarization is the plane of the electrical field.

    Wavelength and Frequency

    • If a radio wave's wavelength is 3.75 meters, its frequency is 80 MHz.
    • A frequency of 125 MHz corresponds to a wavelength of 2.4 meters.
    • A wavelength of 69.8 cm corresponds to a frequency of 4.298 GHz.

    Frequency Bands

    • The frequency band containing 29.1 cm is VHF.

    Phase Comparison of Electromagnetic Waves

    • Both waves must have the same frequency for phase comparison.

    Signal Attenuation

    • Signal strength reduction with increasing range from a transmitter is called attenuation.

    Surface Wave Range

    • 243 MHz will give the greatest surface wave range.

    Increasing Transmitter Range

    • Doubling the range of a 50 nm VHF transmitter to 100 nm requires increasing the power output by 4 times.

    Transmitter Range

    • A 300 kHz transmitter with 1600 watts output has a sea range of 80 nm.

    Aircraft Communication Range

    • A VHF aircraft communication range from 196 ft is 64 nm.

    Minimum Aircraft Height

    • For aircraft detection by a 1600 ft amsl radar at a 200 nm range, the minimum height required is 15,000 ft.

    Atmospheric Ionization

    • The highest levels of ionization are in low latitudes.
    • Ionization levels don't increase linearly with altitude.
    • The E-layer is generally lower at night than during the day.

    HF Communication

    • The frequency required for communication is influenced by latitude, time of day, but not necessarily season.
    • The frequency requirement for short ranges is lower than for long ranges.

    Amplitude Modulation (AM)

    • The amplitude of the RF is modified by the amplitude of the AF.
    • The bandwidth of an AM signal (4716 kHz modulated by 6 kHz) is 12 kHz.

    Single Sideband (SSB)

    • SSB emissions offer advantages of more available frequencies, reduced power requirements, and improved signal-to-noise ratios.

    Frequency Modulation (FM)

    • The frequency of the RF is modified by the frequency of the AF.

    Marconi Aerial

    • The ideal length of a Marconi aerial for 406 MHz is 36.9 cm.

    Slotted Antenna (Phase Array)

    • A slotted antenna (phase array) offers advantages such as reduced sidelobes and improved resolution.
    • It has a disadvantage related to reduced directivity.

    Half-Wave Dipole

    • For a frequency of 75 MHz, the ideal length of a half-wave dipole antenna is 1.9 m.

    VHF Station Altitude

    • For a 300 nm range, the minimum altitude for a VHF contact between a 2500 ft aircraft and a ground station at 2500ft is 1378 ft.

    VDF Accuracy

    • 'B' class VHF DF bearings have an approximate accuracy of +-2 degrees.

    VDF Accuracy Assumptions

    • A VDF QDM, given without an accuracy classification, is assumed to be accurate within 5 degrees.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    NAV Questions 2024-2025 PDF

    Description

    This quiz covers essential concepts of radio wave properties, including polarization, wavelength, frequency, and signal attenuation. Test your understanding of how these properties influence radio transmissions and their applications in various frequency bands.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser