20 Questions
Which component in the TRU smooths out the rectified DC power?
Smoothing circuit
Which factor primarily determines the resonant frequency of an antenna?
Antenna element length
What effect does the insertion of capacitors in antenna elements have on the resonant frequency?
Makes the resonant frequency higher
What does the airport surface detection equipment (ASDE) operate on?
SHF
What is the main advantage of Yagi antennas?
Directional capability
What layer in the ionosphere reflects HF radio waves?
F layer
What mode of SSR has the capability of automatic altitude reporting?
Mode C
What system allows pilots to monitor their own transmission?
Side tone circuit
Which of the following deteriorates HF communication quality?
Magnetic storm
What frequency band does the VOR operate on?
VHF
What is the primary purpose of the antenna tuner in the airborne HF communication system?
To adjust the resonant frequency and perform impedance matching
What is the main characteristic of the Yagi antenna?
It is a directional antenna
Why does the insertion of coils in antenna elements lower the resonant frequency?
Because coils increase the inductance of the antenna
What is the primary purpose of the side tone circuit in an airborne HF communication system?
To allow pilots to monitor their own transmission
What is the main difference between the airport surface detection equipment (ASDE) and the air route surveillance radar (ARSR)?
Frequency band of operation
What is the primary advantage of mode S in SSR?
Capability of addressing a single specific aircraft
What is the primary limitation of the VOR system?
Limited coverage to line of sight
What is the primary effect of magnetic storms on HF communication?
Deteriorates HF communication quality
What is the primary purpose of the transformer rectifier unit (TRU) in an airborne HF communication system?
To convert AC power to DC power
What is the primary characteristic of the F layer in the ionosphere?
It reflects HF radio waves
Study Notes
Radio Equipment and Power
- Radio equipment requires DC power, which is obtained by converting AC output from the engine-driven generator using a transformer rectifier unit (TRU).
- The 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 resonant frequency can be electrically adjusted.
- Insertion of coils in antenna elements lowers the resonant frequency, while insertion of capacitors increases it.
Antenna Types and Applications
- Sleeve, Brown, and Yagi antennas are used for VHF and UHF equipment.
- Yagi antennas are directional.
HF Communication
- HF communication quality can be affected by magnetic storms, Dellinger phenomenon, and fading, depending on the strength of Sun's activity.
- The F layer of the ionosphere reflects HF radio waves.
Communication Systems
- The airborne HF communication system has an antenna tuner that adjusts the resonant frequency and performs impedance matching.
- A carrier wave is generated by an oscillator and modulated with a signal wave (audio).
- The modulated carrier wave is amplified to the required power for transmission.
Aviation Communication Systems
- SSR mode A can discriminate a selected "squawk" code on an aircraft's transponder panel.
- Mode C has automatic altitude reporting, and mode S can address a single specific aircraft with its unique mode-S address.
- VOR operates on VHF, providing bearing information with high accuracy, but limited to line of sight.
- DME is co-located with VOR stations to provide bearing and distance information.
Navigation Systems
- ILS components include a localizer for lateral guidance, a glide slope for vertical guidance, and marker beacons for position information.
- MTSAT provides SBAS for improved GPS navigation, CPDLC, and ADS for oceanic flights.
- INMARSAT provides better communication quality and coverage than HF voice communication, except in polar regions.
Radio Equipment and Power
- Radio equipment requires DC power, which is obtained by converting AC output from the engine-driven generator using a transformer rectifier unit (TRU).
- The 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 resonant frequency can be electrically adjusted.
- Insertion of coils in antenna elements lowers the resonant frequency, while insertion of capacitors increases it.
Antenna Types and Applications
- Sleeve, Brown, and Yagi antennas are used for VHF and UHF equipment.
- Yagi antennas are directional.
HF Communication
- HF communication quality can be affected by magnetic storms, Dellinger phenomenon, and fading, depending on the strength of Sun's activity.
- The F layer of the ionosphere reflects HF radio waves.
Communication Systems
- The airborne HF communication system has an antenna tuner that adjusts the resonant frequency and performs impedance matching.
- A carrier wave is generated by an oscillator and modulated with a signal wave (audio).
- The modulated carrier wave is amplified to the required power for transmission.
Aviation Communication Systems
- SSR mode A can discriminate a selected "squawk" code on an aircraft's transponder panel.
- Mode C has automatic altitude reporting, and mode S can address a single specific aircraft with its unique mode-S address.
- VOR operates on VHF, providing bearing information with high accuracy, but limited to line of sight.
- DME is co-located with VOR stations to provide bearing and distance information.
Navigation Systems
- ILS components include a localizer for lateral guidance, a glide slope for vertical guidance, and marker beacons for position information.
- MTSAT provides SBAS for improved GPS navigation, CPDLC, and ADS for oceanic flights.
- INMARSAT provides better communication quality and coverage than HF voice communication, except in polar regions.
This quiz covers the basics of radio equipment power sources, including the conversion of AC to DC power, and the characteristics of antennas, including resonant frequency and how it can be adjusted.
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