Chapter 5, HF Communications Flashcards
1
Q
The typical bandwidth of an aircraft HF SSB
signal is
A
3.4 kHz
2
Q
The principal advantage of SSB over DSB
AM is
A
Reduced bandwidth
3
Q
HF datalink uses typical data rates of
A
300 bps and 600 bps
4
Q
The standard for HF datalink is defined in
A
ARINC 635
5
Q
Which one of the following gives the
approximate range of audio frequencies used
for SELCAL tones?
A
312 Hz to 1479 Hz
6
Q
How many alphanumeric characters are
transmitted in a SELCAL code?
A
4
7
Q
How many bits are used in an ICAO aircraft
address?
A
24
8
Q
The typical RF output power from an aircraft
HF transmitter is
A
400 W pep
9
Q
An HF radio is required for use on oceanic
routes because
A
VHF coverage is inadequate
10
Q
The function of an HF antenna coupler
is to
A
Match the antenna to the radio
