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COMMS FINAL
VHF...
The VHF control panel/head...
COMMS FINAL
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1
The VHF control panel/head...
Is where navigation information is stored
Routes all VHF audio signals to where they are required
Is where station frequencies are selected
Indicates which VHF station is nearest the aircraft
2
VHF...
Is used by aviation, fire, police and taxi services
Is strictly reserved for aviation use
Takes advantage of radio waves following the contour of the earth
Is used for long distance transoceanic travel
3
"Repeat" is not an acceptable word in communication. Which word has the same meaning and is acceptable?
"Come back now"
"Say again"
"Once again"
"Read over"
4
A VHF communication transceiver...
Requires 1 antenna per transceiver Bcause it can't transmit while receiving
Requires an internal antenna to reduce drag
Does not require an antenna because it is only for internal communications
Requires two antennas, one for transmission, and another for reception
5
The ELT system uses the following frequencies:
2 GHz to 4 GHz
121.5 MHz to 406 MHz
108.00 MHz to 395 MHz
121.5 MHz, 243 MHz, and 406 MHz
6
To be effective SATCOM antennas aboard aircraft...
Must be mounted in pairs for transmission and reception
Must point to the satellite
Are usually mounted on the bottom of the fuselage
Are omnidirectional
7
Questions...
should be asked to narrow down possible causes of the problem
are only useful if you have access to the pilot
indicate a lack of system knowledge
are of limited usefulness in troubleshooting
8
When transmitting a call on an aviation radio, what is said second?
The name and type of the station being called
"Testing testing"
Your call sign
"This is"
9
The Selcal decoder...
Is only operational in USB mode
Has rotary switches with numbers on them
Causes illuminated warning on the flightdeck if it recognizes special tones
Is controlled by rotary switches in the cockpit
10
Selcal tones..
Are four tones transmitted in mixed pairs
Are in the 3MHz to 30MHz range
Assure unique identification because the possible combinations are infinite
Alert the pilot of various errors in the system
11
The VHF transceiver is normally...
In transmit mode
In receive mode
In single sideband (USB) mode
In scan mode
12
What is the frequency range of an aircraft 760 channel VHF communication radio?
2MHZ to 30MHz
118.00MHz to 135.975MHz
118.00MHz to 136.975MHz
100Hz to 10KHz
13
Communications Systems...
Are all radio based
Provide audio only communication between the aircraft and the ground
Are used to move information
Do not include digital data transfer
14
Gather and Evaluate Information...
is not required
is optional if you have test equipment
is done away from the aircraft
is the first step in troubleshooting
15
Troubleshooting involves...
applying what you know to a problem in an organized way
informing the pilot of the steps taken
programming test equipment
reducing costs by reducing weight
16
SATCOM operates...
By interrogating a satellite and timing the response
By comparing the signals of three satellites to provide a 2D positional fix
By relaying information through satellites and ground stations
By relaying comms between satellites to achieve long distance communication
17
ELT stands for
Emergency Locator Transmitter
Extra Large Transmitter
Electronic LORAN Transmitter
Emergency Location Transceiver
18
The USB selection on the HF control panel..
Allows for transfer of data through the control panel via stick
Is only used for ground maintenance
Stores HF data for the entire flight
Selects single side band operation
19
Experience...
shortens the troubleshooting process
means that you don't need to troubleshoot
leads to complacence
usually results in fewer snags
20
The typical impedance of an aircraft microphone set is:
8 Ohms
150 Ohms
500 Ohms
50 Ohms
21
The swap components method of troubleshooting...
is the cheapest method of troubleshooting
is not a true method of troubleshooting
is one of many methods
is the best method
22
Troubleshooting...
is not strictly an avionics technician responsibility
is unique to aviation
is no longer required because of computerized systems
applies only to electronic systems
23
Two key foundational sources of information are:
pilots and supervisors
EFIS and DME
test equipment and observation
Training/Education and Manuals/Textbooks
24
HF comms are unique in their requirement for?
Internal antennas
An antenna coupler
A tone based on a four letter ID
Noise cancelling circuitry
25
The Selcal decoder...
Distributes all audio within the service interphone system
Decrypts messages that have been scrambled for privacy or security
Allows the pilot to select a 4 digit number to transmit to ATC
Allows for a code of 4 letters to be used to identify an aircraft uniquely
26
Troubleshooting is...
Using a multimeter to measure resistance
a systematic approach to problem solving
Replacing components to fix a snag
Running BIT tests to find a problem
27
A Dongle system...
ensures the correct ELT is installed in an aircraft
keeps the battery charged in an ELT
provides GPS data for tracking in an emergency
allows for an ELT to be used in different aircraft
28
SATCOM antennas..
Require regular calibration to ensure data integrity
Are complex because of the requirement to aim the antenna at the satellite
Tend to be large because of the large distances involved
Are simpler than most because they are omnidirectional
29
After an accident the ELT...
Receives information from ATC to aid in rescue attempts
Automatically senses a crash and sends out emergency radio signals
Uses GPS data to detect deceleration
Triggers a rescue when the signal stops transmitting
30
How many VHF transceivers is normal for airliners?
1 for Receiving and 1 for Transmitting
1
3
2
31
The purpose of the HF antenna coupler is?
To combine the transmitted and received signals
To provide protection from EMF interference
To join the antenna to the AMU
To match the antenna impedance to the selected frequency electronically
32
In the phonetic alphabet used in aviation, what is the spoken word for the letter "A"?
Alpha
Answer
Albert
Able
33
SATCOM..
Do not allow voice transmissions because it is a digital system
Requires 24 satellites to provide a positional fix
Is a superior communications technology
Is limited due to the effect of sunspot activity on the ionosphere
34
The VHF radio...
Is a transmitter
Is a transceiver
Is a receiver
Is a transponder
35
The use of Selcal..
Extends the range of VHF communications
Is restricted to a 200 mile limit
Is restricted for emergency use only
Is only used for travelling over oceans
36
For VHF, the PTT...
Mutes the audio from the mic
Activates the Power Transfer Takeoff
Is not used
Switches the radio from receive to transmit
37
The 406 MHz ELT system...
will soon be obsolete
use frequency matching to locate downed aircraft
can provide a fix within 1 to 3 miles of a downed aircraft
has completely replaced the 121.5 MHz system
38
Selcal stands for...
Select Calibration
Selected Call Answering Limit
Selection Calculation
Selective Calling
39
What is the spoken word for urgency?
Help
Urgent
Pan Pan
Mayday
40
Maintenance of ELT
is no longer necessary because of the use of integrated circuitry
is limited to visual inspection of the antenna and LRU
Requires a yearly inspection and test
is governed by manufacturers specifications
41
VHF-Com...
Has been mostly replaced by GPS
Is only used for non-critical communications due to its unreliability
Is also known as simply VHF
Is a special subset of the VHF Radio Frequency Band
42
Historically, many ELT failures were due to
interference from the ionosphere
poor design
insufficient range capabilities
poor maintenance practices
43
The use of Selcal...
Provides precise positional fixes in 2D and 3D
Reduces the interference from selected frequencies
Reduces the volume of HF reception until a code is received
Provides privacy over HF transmissions
44
Symptoms...
only appear when a piece of equipment has completely failed
require test equipment to measure
are invisible signs of malfunction
help to determine the nature of a problem
45
Selcal operates in the....
HF and VHF band
HF band
VHF band
UHF band
46
HF communication systems...
Uses direct line of sight transmission
Takes advantage of radio waves following the contour of the earth
Are used only over ground stations
Are used for long distance communications
47
One advantage of SATCOM...
Is the ability to split frequencies
Is the fact that they do not require antennas
Is the precision of the positional fix
Is the capability for encryption
48
ELT....
uses a barometric bellows to detect rapid deceleration
uses an accelerometer to detect rapid deceleration
uses GPS data to detect rapid deceleration
uses data from the ADC to detect rapid deceleration
49
The 406 MHz ELT system...
does not require satellites for operation
transmits about 5W of power
is strictly a receiver
transmits about 1/10W of power
50
What is the typical audio level on an aircraft speaker?
10 Watts
1 milli Watt
1 Watt
25 milli Watts
