IAN LANG ELECTRONICS

A Level Electronics

AQA Unit5- Communications Sytems

Perhaps it's because I am getting old, but I found this unit to be the easiest of the lot of them. It deals with technologies used in broadcasting and signalling, and begins with the standard question:

1 (a) In the space below draw a block diagram in the space below of a generalised communication system using the following terms:

carrier generator demodulator input transducer

modulator output transducer receiver transmitter

(7 marks)

The next two questions ask you for definitions:

Explain the meaning of the following terms
1 (b) (i) communication

………………………………………………………………………………

………………………………………………………………………………

1 (b) (ii) bandwidth and capacity to carry information.

………………………………………………………………………………

………………………………………………………………………………
(5 marks)

The process of conveying meaningful information from one location to

another.

The measure of the amount of information that can be sent at any given

time. Greater bandwidth means greater capacity for information.

That, if you learn it, is the easiest twelve marks you will pick up in the examination.