NAOPM (Mod 2) Flashcards
- Short radio navigation system
- Calculates the relative bearing
Automatic direction finder
What frequency does ADF operate on
190 kHz - 1750 kHz (medium frequency)
____ is the aircraft equipment
____ is the ground station
- Automatic direction finder
- Non directional beacon
- Equally sensitive to all signals/radius
- No pattern
- Equally distributed
Non directional beacon
ADF system components
ADF antenna (loop & sense) -> ADF receiver -> ADF control panel -> Display/Instrument
Difference between ADF and VOR
ADF has more range
VOR operates in what frequency
Very high frequency
Types of propagation and its operating frequency
- Ground (VLF, LF, MF)
- Sky (HF)
- Space (VHF)
2 types of ADF antenna
- Loop
- Sense
Where is loop antenna located
Bottom of aircraft
Where is sense antenna located
Top of aircraft
ADF instruments
- Relative bearing indicator
- Relative bearing indicator (moving card)
- Radio magnetic indicator
ADF operational modes
- ADF mode
- Antenna mode
- Beat frequency oscillator
ADF mode
- Fully operational
- Loop and sense antenna
- Relative bearing
- Morse identifier is heard
Antenna mode
- Sense antenna
- Morse identifier
Beat frequency oscillator
If the NDB transmits w/out a tone the system will produce a tone so there will be an identifier
Non directional beacon operates in what frequency
LF/MF (190-595 kHz)
- Little used of enroute navigation in the US but still used for approaches
- Used for enroute nav. In much of the world
Non directional beacon
NDBs are also useful at ranges up to
600 N.M.
Transmitter vary in power from ___ watts for ____ on an ILS approach to as much as ____ watts
- 25
- Locator outer markers
- 2000
The range of the most powerful transmitters is listed as ___ miles but is usually much greater
75
4 types of non directional beacon
- Compass locator
- Approach aids
- Enroute beacon
- High power beacon
The Automatic Direction Finder (ADF) consists of :
- AM receiver
- Sense antenna
- Loop antenna
- Indicator
There is a switch on the receiver marked:
- OFF
- ADF
- ANT
- BFO
This switch position gives maximum receiver sensitivity and should be used for tuning and identifying (3letters coded I.D except for LOMs which have 2 letter I.D)
ANT
This switch position is used for better identifying unmodulated signals which are used in other parts of the world.
BFO
