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What does TCAS stand for?
Traffic collision aviodance system
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What modulation type uses a changing frequency on the carrier wave?
Frequency Modulation
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What is the drawback of frequency modulation?
Large bandwidth
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HF is what kind kind of waves?
Sky waves
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VHF and UHF are what kind of waves?
Space waves
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What are the 2 types of carrier wave fields?
electric and magnetic
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What generates the carrier wave?
Oscillator
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What adds information to the carrier waves?
the modulator
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What are the 3 types of microphones?
Carbon Dynamic Electret
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Antenna coupler does 2 things?
Lightning protection and "Tune and peak"
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If the system has no "tune and peak" what tunes the antenna?
The capacitance of the length of Coaxial cable
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4 types of antennas?
- Monopole
- Hertz Dipole
- Straight wire
- Loopwire
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What frequency type does a straight wire antenna sense?
Low frequency
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What does the monopole antenna use for a ground?
the skin of the aircraft
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What direction is a dipole antenna mounted?
Horizontally
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What system uses crystals to tune in a radio frequency?
Superheterodyne
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What determines the distance antennas are mounted?
the length of the antennas
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What sets the sensitivity of VHF?
Squelch knob
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What kind of antenna does a VHF use?
Monopole
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where are VHF antennas mounted?
Bottom of aircraft
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What does SELCAL do?
allows you to talk to one aircraft individually on company frequency without disrupting any others
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What system can update the FMS system enroute, by text , and performs trend monitoring?
ACARS
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ADF uses 2 antennas what are they?
Loop and straight wire
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what kind of antenna does a VOR use?
Dipole on vert stab
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OBS stands for?
Omni Bearing selector
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CDI stands for?
course deviation indicator
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what is the ADV slaved to?
Flux valve
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What affects HF waves
Atmospheric disturbances (weather)
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What 2 kinds of radio waves exist in a radio transmitting antenna to cause it to radiate electrical energy?
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The higher the frequency, the (longer or shorter) the wavelength.
shorter
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The frequency of a radio transmission indicates the number of electromagnetic field ______ that occur in ____ second.
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radio waves travel at the speed of ______
light
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A______ wave is necessary to transmit radio waves and antennas are usually ______ to _____ the length of the transmitted wave.
carrier , one quarter , one half
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Each oscillation is called a ____ and frequency is measured in ____ per second or _____.
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There are 2 ways to modulate a carrier wave?
- amplitude modulation
- frequency modulation
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The 3 basic functions of a radio transmitter are:
- generate signal at the correct frequency
- modulate the signal
- amplify the signal
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What type of radio waves bounce off the ionosphere and can be used to achieve _____-_____ radio transmission.
sky, long range
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The component that generates the carrier wave is called?
oscillator
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A component found in both transmitters and receivers that increases signal strength?
amplifier
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A half wave antenna may also be referred to as a?
Hertz dipole antenna
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The metal surrounding the base of a marconi monopole antenna is called?
ground plane
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Aircraft VHF communications antennas are polarized in what direction?
vertically
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What circuit is used to isolate the desired frequency from all other frequencies picked up by an antenna?
tuning circuit
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HF radios are most commonly used by large aircraft for (general, oceanic, or continental ) ATC communication
oceanic
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Most civilian aviation radio communication is done in the (uhf or vhf) range
VHF
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VHF comms are limited to line of sight. true or false
true
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A special VHF/HF communication system for calling a single specific aircraft is known as ?
SELCAL
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SATCOM radios operate in the (VHF or UHF) range and can carry both _____ and _____ communication.
UHF , Voice and Data
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ACARS is a system for transmitting routine operational, maintenance and administrative messages to airliners via?
digital data link
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The 2 antennas required for an ADF are?
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ADF is (air or ground) equipment while NDB are (air or ground) equipment
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What does ADF stand for?
automatic direction finder
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what does NDB stand for?
Non directional beacon
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ADF operates in the (LF/MF or VHF/UHF) range
LF/MF
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VOR is a (phase or voltage) comparison system
phase
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VOR nav radios used for IFR ops must be checked for accuracy every how many days?
30
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DME is or is not a form of pulse equipment?
is
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An RNAV must be tuned to a VOR or VORTAC system to operate normally
VORTAC
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GPS is a ground or space based system
space
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Inertial nav systems do or do not require an external radio signal?
do not
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INS systems operate by accurately measuring ?
acceleration
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