MOD 1 2 3

Question 1

What is repeatability?

Answer 1

A method of expressing the accuracy of a navigation system, the ability of the user to return to the same location using the same methods

Question 2

How many pulses does the MASTER station have?

Answer 2

9 pulses

Question 3

How many pulses do the SECONDARY stations have?

Answer 3

8 pulses

Question 4

What is the carrier wave pulses tuned to?

Answer 4

100kHz

Question 5

What pulses has the maximum power in a burst?

Answer 5

the 8th pulse

Question 6

The receiver measures the _________ between the master and the secondary stations

Answer 6

difference

Question 7

The difference in distance between 2 stations creates what kinds of lines of position?

Answer 7

hyperbolic

Question 8

The time between each master station transmission is called __________

Answer 8

group repetition interval (GRI)

Question 9

What pulse is the principal timing point (timing reference) for a LORAN pulse?

Answer 9

The 3rd pulse because there is no sky wave contamination

Question 10

How long is each pulse?

Answer 10

Each pulse is 270uS in duration

Question 11

How much time is between pulses?

Answer 11

1mS, but for the master the last 2 are 2mS

Question 12

An imaginary line drawn between the master and each secondary

Answer 12

Baseline

Question 13

The coverage of a LORAN chain is determined by

Answer 13

Power transmitted, distance between, and geometry

Question 14

What is needed in order to determine a position fix?

Answer 14

2 intersecting lines of position

Question 15

Whats the typical range coverage of a LORAN chain?

Answer 15

1200 - 1900km

Question 16

What can be determined by the LORAN data?

Answer 16

Positional latitude and longitude
Flight plan and route info
status of loran chain
course left/right info

Question 17

What frequencies does the ADF operate on?

Answer 17

190kHz to 1750kHz

Question 18

What kind of wave propagation does ADF use?

Answer 18

Ground wave

Question 19

Loop antenna utilizes the _______ field of the wave

Sense antenna utlizes the _______ field of the wave

Answer 19

Magnetic field

Electrostatic field

Question 20

What does ADF give direction to?

Answer 20

Relative bearing to a non directional beacon (NDB)

Question 21

7 limitations for ADF

Answer 21

Electrical Interference (electronics within aircraft)
Natural interference (lightning storms) (p-stat)
Night effect (Shape of ionosphere changes the wave propagation)
Coastal effect (lakes and oceans near a coast)
Attitude Error (banking could block antenna)
Quadrantal error (caused by physical shape of aircraft)

Question 22

the pattern of the loop and sense together is a

Answer 22

cardioid pattern

Question 23

what is a goniometer and what does it do?

Answer 23

A resolver made up of coils / windings (sin and cos), and the rotor winding will have a signal of 2 nulls, determining a LOP

Question 24

What does the balanced modulator produce?

Answer 24

Only the sum and difference frequencies and switches the phase at a rate equal to the servo reference frequency

Question 25

What does the 90 degree phase shift network do?

Answer 25

Phase shifts the signal by 90 degrees. Compares the output from the loop with the sense. Eventually makes it in phase with the sense, or 180 degrees out of phase

Question 26

The goal of the goniometer is to point towards what?

Answer 26

One of the 2 nulls, which will tell the servo motor to stop rotating the winding

Question 27

What does the loop amp do?

Answer 27

Amplifies the loop antenna signal

Question 28

The loop amp / 90 degree phase / balanced mod lead to what?

Answer 28

The RF amp

Question 29

What does the RF amp do?

Answer 29

It amplifies the signal from the goniometer (loop antenna) and the sense antenna. In phase = large amplitude signal, out of phase = small amplitude signal

Question 30

What does the servo amp compare?

Answer 30

If the signal is in phase or out of phase with the servo reference frequency, determining CW or CCW rotation of the motor in the goniometer

Question 31

Difference between closed loop vs open loop?

Answer 31

Open loop has no feedback from the indicator / receiver back to the antenna Open loop uses a phase detector or coherent detector

Question 32

When testing an ADF with an antenna box, it is useful to know the _________

Answer 32

Room factor

Question 33

If sense is weaker than loop, it will result in a ________

Answer 33

deadspot

Question 34

If sense is stronger than loop , it will result in a _________

Answer 34

confused needle

Question 35

Frequency range for VOR is

Answer 35

between 108.00MHz to 117.95MHz

Question 36

Propagation for VOR is

Answer 36

Space wave or direct wave

Question 37

Range for localizer (ILS) is

Answer 37

108.10MHz to 111.95MHz

Question 38

Name of ground station for VOR and DME

Answer 38

VORTAC

Question 39

VOR is usually a ________polarized and mounted where?

Answer 39

Horizontally polarized mounted on the vertical stablizer