AET Communication Systems

Question 1

What frequency band does aviation VHF communication primarily use?

Accepted Answer

118–137 MHz

Answer

88–108 MHz

Answer

406–512 MHz

Answer

960–1215 MHz

Question 2

What modulation type is used by VHF aviation voice communication radios?

Accepted Answer

AM

Answer

FM

Answer

SSB

Answer

DSB

Question 3

What is the channel spacing used by modern 8.33 kHz VHF aviation radios in Europe?

Accepted Answer

8.33 kHz

Answer

25 kHz

Answer

50 kHz

Answer

100 kHz

Question 4

Which component in a VHF comm transceiver ensures the carrier frequency is stable?

Accepted Answer

Frequency synthesizer with PLL

Answer

Mixer

Answer

IF amplifier

Answer

Squelch circuit

Question 5

What is the purpose of a squelch circuit in an aviation receiver?

Accepted Answer

Mute the receiver when no signal is present

Answer

Amplify weak signals

Answer

Filter harmonics

Answer

Reduce transmitter power

Question 6

What does SELCAL stand for in aircraft communication systems?

Accepted Answer

Selective Calling System

Answer

Self-Calibrating Amplifier Loop

Answer

Sequential Electronic Link Call

Answer

Satellite Electronic Communication Link