Radio nav 1st Lessson

Question 1

Perpendicular to the wire (sideways)

Answer 1

Magnetic field (H)

Question 2

Parallel to the wire up & down

Answer 2

Electric field (E)

Question 3

Magnetic field & electric field are both propagating (spreading out) at

Answer 3

The speed of light

Question 4

Time =

Formula

Answer 4

1/frequency

Question 5

Wavelength =

Formula

Answer 5

Speed of light / frequency

Question 6

Kilo … 10 ^ ?

Answer 6

10^3

Question 7

Mega…10^?

Answer 7

10^6

Question 8

Giga…10^?

Answer 8

10^9

Question 9

Unit

Answer 9

=0

Question 10

Milli…10^?

Answer 10

10^-3

Question 11

Micro…10^?

Answer 11

10^-6

Question 12

Nano..?

Answer 12

10^-9

Question 13

Pico

Answer 13

10^-12

Question 14

Speed of light ?
In the x10^ ms^-1 sense
And the NMS^-1 sense

Answer 14

3x10^8 ms^-1

162,000 nms^-1

Question 15

Radio part of the electromagnetic spectrum has frequencies from

Answer 15

3 KHZ to 300GHz

Question 16

3 Types of Radio comms

Answer 16

Key modulation (morse code) switch on/off transmitter

Pulse modulation

Phase modulation - phase forward by 90⚫️

Question 17

Double side bands can cause

LSB=USB

Answer 17

Station interference

Question 18

Single sideband

Used in HF-long range (need specially designed SSB receiver/transmitter in order to use it)

Answer 18

• Uses half bandwidth
• allows more power for range and less for transmission
• improves signal to noise ratio