Radio Aids and Radio Navigation UPDATED ACTUAL Questions and CORRECT
Answers
The interval between any 2 points measuring the comple-
Cycle
tion of a single wave movement.
The actual length of one wave measured in metres. Wave length
The strength or width of one wave. Amplitude
The number of cycles per second. Frequency
Cycles per second Hertz (Hz)
Thousands of cycles per second Kilohertz (Kz)
Millions of cycles per second Megahertz (Mz)
Billions of cycles per second Gigahertz (Gz)
The bending of a wave as it passes from one medium to
Refraction
another or through a single medium of varying density.
A change in direction of travel of a wave occurs at the
Reflection
surface separating 2 different media.
Bending which occurs when a wave grazes the edge of a
Diffraction
solid object through which it cannot pass.
The loss of wave energy as it travels through a medium. Attenuation
1. Ground waves
Waves emitted from a transmitting site can be one of three
2. Space waves
types:
3. Sky waves
1. Transmitted radiation that follows surface of the Earth
Describe ground waves. How are they affected? What 2. Suffers from surface attenuation proportional to the
doesn't affect them? frequency
3. Not subject to ionospheric interference or weather
Do higher or lower frequencies = less attenuation? Lower frequencies
Describe space waves. Transmitted radiation that travel into space.
, Transmitted radiation that is reflected/refracted from the
Describe sky waves. ionosphere. Continues to reflect between earth and sky
until completely attenuated.
Zone of silence between the point where the ground wave
becomes too weak for reception and the point where the Skip zone
sky wave is first returned to Earth.
VLF frequency range 3 - 30kHz
LF frequency range 30 - 300kHz
MF frequency range 300KHz - 3MHz
HF frequency range 3 MHz - 30 MHz
VHF frequency range 30MHz - 300MHz
UHF frequency range 300MHz - 3GHz
SHF frequency range 3 GHz - 30GHz
EHF frequency range 30-300 GHz
Which radio frequency categories constitute *ground
VLF, LF, MF
waves*?
Which radio frequency categories constitute *sky waves*? HF
Which radio frequency categories constitute *space
VHF, UHF, SHF, EHF
waves*?
What is the frequency allocation for VOR? 108.1 to 117.95 MHz
1) Reference phase
VOR transmits 2 signals. What are they called?
2) Variable phase
Time (sec) for radial change / Degrees of radial change =
What is the formula for Time to Fly to a Station?
Time to station (min)
A TACAN is similar to a VOR but uses frequencies and
UHF, military
is for use.
2/7
Answers
The interval between any 2 points measuring the comple-
Cycle
tion of a single wave movement.
The actual length of one wave measured in metres. Wave length
The strength or width of one wave. Amplitude
The number of cycles per second. Frequency
Cycles per second Hertz (Hz)
Thousands of cycles per second Kilohertz (Kz)
Millions of cycles per second Megahertz (Mz)
Billions of cycles per second Gigahertz (Gz)
The bending of a wave as it passes from one medium to
Refraction
another or through a single medium of varying density.
A change in direction of travel of a wave occurs at the
Reflection
surface separating 2 different media.
Bending which occurs when a wave grazes the edge of a
Diffraction
solid object through which it cannot pass.
The loss of wave energy as it travels through a medium. Attenuation
1. Ground waves
Waves emitted from a transmitting site can be one of three
2. Space waves
types:
3. Sky waves
1. Transmitted radiation that follows surface of the Earth
Describe ground waves. How are they affected? What 2. Suffers from surface attenuation proportional to the
doesn't affect them? frequency
3. Not subject to ionospheric interference or weather
Do higher or lower frequencies = less attenuation? Lower frequencies
Describe space waves. Transmitted radiation that travel into space.
, Transmitted radiation that is reflected/refracted from the
Describe sky waves. ionosphere. Continues to reflect between earth and sky
until completely attenuated.
Zone of silence between the point where the ground wave
becomes too weak for reception and the point where the Skip zone
sky wave is first returned to Earth.
VLF frequency range 3 - 30kHz
LF frequency range 30 - 300kHz
MF frequency range 300KHz - 3MHz
HF frequency range 3 MHz - 30 MHz
VHF frequency range 30MHz - 300MHz
UHF frequency range 300MHz - 3GHz
SHF frequency range 3 GHz - 30GHz
EHF frequency range 30-300 GHz
Which radio frequency categories constitute *ground
VLF, LF, MF
waves*?
Which radio frequency categories constitute *sky waves*? HF
Which radio frequency categories constitute *space
VHF, UHF, SHF, EHF
waves*?
What is the frequency allocation for VOR? 108.1 to 117.95 MHz
1) Reference phase
VOR transmits 2 signals. What are they called?
2) Variable phase
Time (sec) for radial change / Degrees of radial change =
What is the formula for Time to Fly to a Station?
Time to station (min)
A TACAN is similar to a VOR but uses frequencies and
UHF, military
is for use.
2/7
