3-K-071: Automatic Direction Finding Equipment (ADF) & Transponders
3-71K1:
What is the frequency range of an aircraft’s Automatic Direction Finding (ADF) equipment?
190 kHz to 1750 kHz.
190 MHz to 1750 MHz.
108.10 MHz to 111.95 MHz.
108.00 MHz to 117.95 MHz.
3-71K2:
What is meant by the term “night effect” when using an aircraft’s Automatic Direction Finding (ADF) equipment? Night effect refers to the fact that:
Non Directional Beacon (NDB) transmissions can bounce-off the Earth’s ionosphere at night and be received at almost any direction.
All Non Directional Beacon (NDB) transmitters are turned-off at dusk and turned-on at dawn.
An aircraft’s ADF transmissions will be slowed at night due to the increased density of the Earth’s atmosphere after sunset.
An aircraft’s ADF antennas usually collect dew moisture after sunset which decreases their effective reception distance from an NDB transmitter.
3-71K3:
What are the transmit and receive frequencies of an aircraft’s mode C transponder operating in the Air Traffic Control RADAR Beacon System (ATCRBS)?
Transmit at 1090 MHz, and receive at 1030 MHz
Transmit at 1030 kHz, and receive at 1090 kHz
Transmit at 1090 kHz, and receive at 1030 kHz
Transmit at 1030 MHz, and receive at 1090 MHz
3-71K4:
In addition to duplicating the functions of a mode C transponder, an aircraft’s mode S transponder can also provide:
Mid-Air collision avoidance capabilities.
Primary RADAR surveillance capabilities.
Long range lightning detection.
Backup VHF voice communication abilities.
3-71K5:
What type of encoding is used in an aircraft’s mode C transponder transmission to a ground station of the Air Traffic Control RADAR Beacon System (ATCRBS)?
Pulse position modulation.
Differential phase shift keying.
Doppler effect compressional encryption.
Amplitude modulation at 95%.
3-71K6:
Choose the only correct statement about an aircraft’s Automatic Direction Finding (ADF) equipment.
An aircraft’s ADF antennas can receive transmissions that are over the Earth’s horizon (sometimes several hundred miles away) since these signals will follow the curvature of the Earth.
An aircraft’s ADF transmission exhibits primarily a line-of-sight range to the ground-based target station and will not follow the curvature of the Earth.
Only a single omnidirectional sense antenna is required to receive an NDB transmission and process the signal to calculate the aircraft’s bearing to the selected ground station.
All frequencies in the ADF’s operating range except the commercial standard broadcast stations (550 to 1660 kHz) can be utilized as a navigational Non Directional Beacon (NDB) signal.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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