Radio Theory Flashcards
(12 cards)
1
Q
What is the bandwidth for navigational frequencies?
A
109 - 117.975MHZ
2
Q
What is the bandwidth for voice frequencies?
A
118 - 137 MHZ
3
Q
What is VHF propagated by?
A
Space waves.
4
Q
What is HF propagated by?
A
Sky waves
5
Q
What type of modulation is used in VHF comms?
A
Amplitude modulation.
6
Q
What is a transmission principally degraded by?
A
Moisture
7
Q
Above what frequency is attenuation greater?
A
Above 100MHZ
8
Q
How do you calculate the maximum theoretical range for a transmission?
A
(nm) = 1.23 x ( the square root of transmitter elevation plus the square root of receiver elevation) FEET
9
Q
What is the max theoretical range?
A
250nm
10
Q
What is the typical VHF frequency spacing?
A
25 kHz
11
Q
What is the updated spacing for more channels??
A
8.22kHz
12
Q
Whats the morse code for maintenance?
A
_ … _ OR _ . … _
