Basic Propagation Theory Flashcards
What is an NDB connected with?
ADF
What type of indication do radio waves give?
Magnetic
What is the speed of light in nautical miles per second?
161,800nm/s
What is a cycle?
A completed series of values of a periodical process.
What is the principle of operation of a vor?
Phase angle
Whats another name for direct and line of sight waves?
Space waves.
What frequency does ILS LOC use?
Very high
What frequency does ILS GP use?
Ultra High
What is the first character of a radio signal?
The type of modulation.
What is the second character of a radio signal?
Nature of the signal
What is the third character of a radio signal?
Type of information transmitted
What is the code for a carrier without modulation?
N0N
What is the code for a carrier with keyed morse code modulation?
A1A
What is the code for a carrier with amplitude modulated morse code?
A2A
Whats the code for a carrier with amplitude modulated speech?
A3E
Whats the code for a DME?
P0N
Whats the code for an ILS?
A8W
Whats the code for a VOR?
A9W
What is the simplest form of modulation?
Keying
Where would you see single sidebands?
HF comms and HF VOLMET
Any conductor with an alternating current through it because a what?
Wave transducer
What is the simplest form of an antenna?
Half wave dipole
Where do you get no signal on a dipole antenna?
Above
Where would you find a loop antenna?
ADF
Where would you find a parabolic antenna?
Older AWR
Where would you find a slotted planar array antenna?
Modern AWR
Where would you see a helical antenna?
GPS
What frequency and above only sees space and line of sight wave propagation?
VHF
What ionosphere layer disappears at night?
D
What is the skip distance?
Aerial to first returning sky wave.
Whats skip zone?
Distance between surface wave and first returning sky wave.
What does natural static noise affect?
VHF and below
What does man made static noise affect?
VHF and above
What is Fading?
Interference of a ground wave and a sky wave.
A student pilot has just learnt that meteorological information for aircraft en route on long-haul flights is sent by radio. What kind of radio receiver is needed to receive this information?
Single side band reciever
Which aeronautical radio frequency band uses refraction within ionospheric layers?
HF
Which aeronautical radio frequency band uses refraction within ionospheric layers?
HF