What process do high-frequency carrier radio waves undergo before transmission over long distances?
Modulation using audio signal information.
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5
What is frequency deviation, Îf ?
The maximum variation in frequency.
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15
What is the function of an analogue to digital converter?
The analogue signal is sampled at a number of regular time intervals and then each is converted to a binary number.
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15
What are wire pairs? One example of uses
Wire pairs are links between information transmitters and receivers. Nowadays they are used for low frequency short distance communications, e.g. doorbells.
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15
How do geostationary satellites and ground stations avoid de-sensing?
They transmit at different frequencies.
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10
What is the effect of frequency modulation (FM) on the amplitude of the carrier wave?
None, the amplitude is constant but the frequency is varied depending on frequency variations of the audio signal.
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10
Which transmission media has the highest bandwidth?
Optical fibres.
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What are microwave links?
Line of sight transmission paths to receive and transmit information at microwave frequencies.
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25
What are 2 ways to improve the reproduction of input signal
1. Increase the number of bits . number for each sampling so that the step height is reduced. 2. Increase sampling frequency so that the depth isis reduced.
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5
Do FM or AM signals have higher noise immunity?
FM.
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10
What two forms can metal wire be found as in communication systems?
1. Coaxial cable. 2. Twisted pair cable.
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25
What are 3 advantages of optical fibres compared to coaxial cables?
1. Larger bandwidth. 2. Lower attenuation of signal. 3. More secure.