A & P

Question 1

What is the speed of light in meters per second?

Answer 1

300,000,000 mps

Question 2

What is the civilian HF frequency band?

Answer 2

3 MHz to 30 MHz

Question 3

How many 5khz channels would you get in the UHF bandwidth? (Remember-kilohertz: 1000 hertz, megahertz: 1000, 000)

Answer 3

UHF bandwidth is 300-3000Mhz giving 2700 MHz bandwidth; therefore answer should be 2700, 000, 000 divided by 5000 equals: 5400 channels

Question 4

What is the relationship between Wavelength and Frequency?

Answer 4

Higher Frequency shorter wavelength

Question 5

What is the polarization of a SATCOM antenna?

Answer 5

Polarization of a Satcom antenna is circular

Question 6

Name the three components of a radio wave?

Answer 6

Frequency ( f )
Wavelength ( lambda )
Velocity ( v )

Question 7

How will the ionosphere affect at night effect UHF Tacsat communication?

Answer 7

Less resistance and refraction than than during the day time. therefore less interference and potential clearer Tacsat comm

Question 8

How will the ionosphere affect HF comms at night?

Answer 8

Higher frequencies will pass through the ionosphere and less will be reflected back to the surface

Question 9

Name the three types of radio wave?

Answer 9

Skywave
Space wave - Direct wave
- Ground reflected
Surface wave

Question 10

Give one predictable Ionospheric variation?

Answer 10

Geographical
Seasonal
Daily
Sunspot cycle

Question 11

Give one unpredictable Ionospheric variation?

Answer 11

Solar flares
Magnetic storms
Sporadic E

Question 12

What is the symbol for writing wavelength and its name?

Answer 12

LAMBDA

Question 13

Name 2 factors effecting surface wave?

Answer 13

Polarisation
Frequency
Ground
Terrain
Obstacles

Question 14

Factors effecting space wave?

Answer 14

Antenna height
Refraction in lower atmosphere
Obstacles terrain

Question 15

Name the layers of the ionosphere and what happens at night?

Answer 15

F2
F1
E
D

Turn into one F layer at night

Question 16

Explain skip zone?

Answer 16

The zone where surface wave stops and sky wave returns to Earth

Question 17

Explain skip distance?

Answer 17

Distance where the wave leaves antenna to where it first returns to Earth

Question 18

What does NVIS stand for?

Answer 18

Near Vertical Incidence Skywave

Question 19

Name two factors common to all 3 types of propagation?

Answer 19

Antenna
Noise
Power output of transmitter
Receiver

Question 20

What is the working out triangle ?

Answer 20

V
_________
F | Lambda

Question 21

Name the antenna categories?

Answer 21

Resonant
Traveling wave
Wideband/broadband

Question 22

What is the calculation for a ¼ wavelength antenna for a freq of 9 MHz?

Answer 22

300,000,000 metres per second divided by 9,000,000 hz equals: 33.3 metres. Divided by four to produce a 1/4λ antenna equals: 8.3 metres

They may also answer: 75/9 which also equals 8.3 metres.

Question 23

What travels faster through Free Space, radio waves, gamma waves or x-rays ?

Answer 23

None, they all travel the same speed – the speed of light

Question 24

In what direction do you get the most gain (signal strength) from an HF Dipole Antenna?

Answer 24

The HF Dipole is omni-directional at close range, but for highest gain and furthest distance the antenna needs to be orientated broadside on towards the receiving station

Question 25

Name the 5 components of a radio station?

Answer 25

``` power supply inteligence input and output transceiver transmission line antenna ```

Question 26

What does EMC stand for?

Answer 26

Electromagnetic Capability

Question 27

What do AM and FM stand for?

Answer 27

``` AM = Amplitude modulation FM = Frequency Modulation ```

Question 28

What does USB AND LSB stand for?

Answer 28

Upper side band | Lower side band

Question 29

Factors effecting surface wave range?

Answer 29

``` height polarisation type of ground frequency terrain ```

Question 30

What does the power supply do on a radio station?

Answer 30

dc power | drives electronic components

Question 31

What is the transceiver made up of??

Answer 31

RF transmitter | RF receiver

Question 32

What does the rRF transmitter do??

Answer 32

converts speech into RF | amplifies it into a signal to TX

Question 33

What does the RF receiver do??

Answer 33

RF intelligence from antenna | amplifies and convert it back to its original form

Question 34

What is the intelligence input and output made up of?

Answer 34

headset or handset microphone

Question 35

What is the transmission line?

Answer 35

Coax

Question 36

What capabilities must the transmission line have?

Answer 36

Flexible and robust

Question 37

What is the antenna made up of?

Answer 37

TX antenna | RX antenna

Question 38

What is the definition of a frequency?

Answer 38

Frequency is the number of complete cycles of an alternating radio wave that pass a given point in 1 secondA AND P Q

Question 39

Two materials use in antenna makeup and resistance number??

Answer 39

Copper wire - 71.3 | Brad - 68.5

Question 40

When does a resonant antenna perform to the best effectiveness?

Answer 40

When the length of the antenna corresponds to the wavelength in use

Question 41

What does MEMIC stand for? And what causes it?


Answer 41

Mobile Electromagnetic Incompatibility | Vibrating metal objects

Question 42

Surfaces wave range?


Answer 42

Ranges up to 100km

Question 43

What is a UNipole half of?

Answer 43

A dipole