Communication Systems Flashcards
What are the main components of a communication system
- VHF radio
- UHF radio
- HF radio
- Controller (UFCP)
- Intercom (ICS)
- Transponder (including ADS-B)
- ELT (emergency locator transmitter)
What are the 3 main frequencies and their bands
HF = 3 - 30 MHz VHF = 30 - 300MHz UHF = 300 - 3000MHz
What are HF comms primarily used for and what is their range. And can it be used beyond line of sight?
Long range comms
1600km
Yes
What are average VHF comms distance at 1000ft and 10,000
30, 123 miles
What are the 3 main components of a typical VHF system
Transceiver
Controller
Antenna
What is the typical operating band of a UHF system
225 - 400 MHz
Is UHF AM or FM used by military?
Am
What are some functions a cockpit intercom provides
- Voice comms between aircrew
- Monitoring communications reciever audio
- Monitoring navigation reciever audio
- Selection of a comms system to transmit on
- Audio control to transmitting comms system
What has the implementation of digital data allowed in modern aircraft
Allows multiple systems to communicate with eachother through a single interface
(UFCP)
What generally activates an emergency locator transmitter (ELT)
Ejection or excessive G
What is an ELT
Emergency battery powered transmitter
What does the PC21 communication system provide audio comms between and what is its secondary function
- both pilots
- pilot and ground crew
- own aircraft and other aircraft
- own aircraft and interrogators (ground or air)
2nd:
- Emergency transmission for aircraft location
What components does the comms system consisit of in the avionics bay
- Audio managment unit (AMU)
- UHF/VHF recievers
- ELT
Where are the respective antennas for the comms system
- Upper ATC/ ADS-B
- UHF/ VHF 2
- ELT
All just forward of Vertical stabilizer - UHF/ VHF 1
Below others, on underside - Lower ATC/ ADS-B
Below wings
What does the UHF/VHF reciever guard do
Constantly monitors VHF & UHF guard frequencies 121.5 & 243 MHz
What 2 main components make of the ELT
Transmitter uni
Interface unit
What does the pc21 have to dissipate static charge and how many
Static discharges
21
How does static charge affect communications
It can disrupt LF reception or VHF interference
What are the 5 communication controls in the front cockpit
- COMM panel on right console
- Decouple panel above RH mfd
- ELT remote control panel on rear of right console
- PTT switch PCL
- Instructor switch on left console
Where is communication system related data shown
- UFCP
- FMS
- MFDs (both)
What does the COMM 2 button on the decouple panel do
Allows instruction to transmit without student hearing
What does the AMU control
UHF, VHF radios
Intercom
Aural warning tones
Where does the AMU recieve inputs from
DWP
RIOCs 3 & 4
What would cause damage to AMU WRT receiving and transmitting
If simultaneously transmitting and receiving occured on the same channel
