Basic Radio Theory - Ch 1 Flashcards
1
Q
Wavelength =
A
= Speed of light / frequency
2
Q
Amplitude
A
The power or noise - magnitude of oscillation
3
Q
Phase
A
The shift from a reference
4
Q
Doppler Effect
A
Converging = increased frequency
Diverging = decreased frequency
5
Q
Modulation
A
The way of transporting information on EM waves
Done by altering the frequency, amplitude, phase or status
6
Q
Amplitude Modulation
A
Signal alters amplitude, prone to noise spike or error
7
Q
Frequency Modulation
A
Changing frequency to alter signal
8
Q
Phase Modulation
A
Complex that requires complex demodulator but used in GPS
9
Q
Sideband
A
Upper and Lower (USB and LSB)
Single used in HF Comms
10
Q
When is a BFO switch required
A
When the signal is A1A
11
Q
Max Theoretical Distance of a wave
A
1.23 x ( square root of transmitter height + square root of receiver height)
12
Q
Ionosphere
A
Changed by the sun Impacts EM waves Higher during the day and lower at night Effect HF range Can be called 'F layer" (for us)
