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Data communication systems (A-level only)

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Question 11
a.

State one advantage of using frequency modulation (FM) rather than amplitude modulation (AM) for radio communications.

[1]
b.

The frequency range of a VHF FM radio band in a particular country is 88.0 MHz to 108.0 MHz. The FM stations are allocated frequency slots with a channel spacing of 250 kHz250\text{ kHz}250 kHz.

Calculate the maximum number of stations that can be accommodated within this frequency range.

[3]
c.

A radio station broadcasting on this FM band transmits a signal with a maximum audio frequency of 12 kHz12\text{ kHz}12 kHz and a maximum frequency deviation of ±100 kHz\pm 100\text{ kHz}±100 kHz.

Determine, using Carson's Rule, whether this transmission fits within the 250 kHz250\text{ kHz}250 kHz channel spacing allocation.

[3]

Data communication systems (A-level only) Questions

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  3. /Data communication systems (A-level only)