F023 TAv 21 - Comms EO 21.01

What factor(s) determine the range of a Ground Wave?

• The terrain the wave is traversing (Land or Sea)

• The time of day

• The height of the ionosphere

• The line of sight in relationship to the horizon

What factor(s) determine the range of a Sky Wave?

• The terrain the wave is traversing (Land or Sea)

• The frequency

• The condition of the ionosphere

• The line of sight in relationship to the horizon

• Transmitter power

Which radio band is used in systems to permit aircraft to operate within controlled airspace (air to air and air to ground)

Which radio band is used in systems that enable the aircraft to operate successfully in a battlefield scenario, (secure communications with allied platforms)

Which of the following radio wave bands use Ground (surface) Waves as their method of propagation?

• VLF

• MF

• HF

• UHF

• VHF

Which of the following radio wave bands use Sky Waves as their method of propagation?

• VLF

• MF

• HF

• UHF

• VHF

Which of the following radio wave bands use Direct (space) Waves as their method of propagation?

• VLF

• MF

• HF

• UHF

• VHF

in the diagram regarding sky wave propagation what term is being represented by a?

• Critical Frequency

• Sky Wave

• Ground Wave

• Dead Space

• Skip Distance

in the diagram regarding sky wave propagation what term is being represented by b?

• Critical Frequency

• Sky Wave

• Ground Wave

• Dead Space

• Skip Distance

in the diagram regarding sky wave propagation what term is being represented by c?

• Critical Frequency

• Sky Wave

• Ground Wave

• Dead Space

• Skip Distance