Flashcards in Radio Theory Deck (19)
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1
Range of frequencies and wavelengths of HF band?
3 MHz - 30 MHz
100m - 10m (decametric)
2
Range of frequencies and wavelengths of VLF band?
3 kHz - 30 kHz
100km - 10km (myriametric)
3
1 KHz=
1 MHz=
1 GHz=
1 KHz= 1000 Hz
1 MHz= 1 000 000 Hz
1 GHz= 1 000 000 000 Haz
4
What is the formula to find frequency?
What units must each be in?
F= C/W
Frequency in Hz
Speed of light in m/s
Wavelength in meters
5
Range of frequencies and wavelengths of UHF band?
300 MHz - 3 ghz
1m - 10cm (decimetric)
6
Range of radio frequencies (lowest to highest)
3 kHz - 300 ghz
7
What is the speed of light per second?
300 000 000 m/s (3x10p8 m/s)
162 000 NM/s
8
Range of frequencies and wavelengths of MF band?
300 kHz - 3 MHz
1km - 100m (hectometric)
9
Mnemonic to remember frequency bands?
Very
Lovely
Maidens
Have
Very
Useful
Sewing
Equipment
10
Range of frequencies and wavelengths of EHF band?
30 ghz - 300ghz
1cm - 1mm (millimetric)
11
Range of frequencies and wavelengths of LF band?
30 kHz - 300 kHz
10km - 1km (kilometric)
12
Range of frequencies and wavelengths of VHF band?
30 MHz - 300 MHz
10m - 1m (metric)
13
What is a transducer?
A device that converts energy from one type to another
14
Range of frequencies and wavelengths of SHF band?
3 ghz - 30 ghz
10cm - 1cm (centimetric)
15
What is Amplitude Modulation and Frequency Modulation?
Addition of information to the carrier wave by varying the amplitude and frequency respectively
16
Ideal size of a dipole aerial?
Quarter or half the wavelength
17
A parabolic aerial transmits...
Directional signals (pencil beam)
18
A phase array aerial is made up of...
A series of small
19
