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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

What is Doppler shift?

An apparent change in frequency due to the relative movement between the transmitter and receiver.

Moving towards each other will increase frequency, moving away will reduce frequency.