quiz from the reference ELECTIVE VHF

a. 45 deg

the angle between the successive phase changes of a d8psk signal is

(a) 45 deg
(b) 90 deg
© 180 deg

C. DSB AM

the method of modulation currently employed for aircraft vhf voice communication is?
a. MSK
b. D8PSK
c. DSB AM

A. 8.33 KHZ AND 25 KHZ

THE CHANNEL SPACING USED IN EUROPE FOR AIRCRAFT VHF VOICE COMMUNICATION IS
A. 8.333 KHZ AND 25 KHZ
B. 12.5 KHZ AND 25 KHZ
C. 25 KHZ AND 50 KHZ

1.1 SQRT OF ALTITUDE

FORMULA FOR LOS RANGE

C. To increase the average level of modulation

FUNCTION OF THE COMPRESSOR STAGE IN AN AIRCRAFT VHF RADIO IS
(a) to reduce the average level of modulation

(b) to increase the average level of modulation

(c) to produce 100% modulation at all times.

A. to eliminate noise when no signal is received

FUNCTION OF THE SQUELCH STAGE IN AN AIRCRAFT VHF RADIO IS
(a) to eliminate noise when no signal is received

(b) to increase the sensitivity of the receiver for weak signals

(c) to remove unwanted adjacent channel interference.

B. three VHF radios

LARGE PASSENGER NORMALLY CARRY
(a) two VHF radios

(b) three VHF radios

(c) four VHF radios.

B. 7KHZ

The typical bandwidth of a DSB AM voice signal is
A, 3.4 KHZ

B. 7KHZ

C. 25 KHZ

B. the possibility of adjacent channel interference

The disadvantage of narrow channel spacing is:

• (a) the need for increased receiver sensitivity

• (b) the possibility of adjacent channel interference

• (c) large amounts of wasted space between channels.

C. ARINC 724

The standard for ACARS is defined in:

• (a) ARINC 429

• (b) ARINC 573

• (c) ARINC 724

25 W

The typical output power of an aircraft VHF radio using voice mode is: