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Data communication systems (A-level only)

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Question 6
a.

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

[1]
b.

A telemetry band allocated for high-altitude scientific research balloon transmissions ranges from 144.0 MHz144.0\text{ MHz}144.0 MHz to 148.0 MHz148.0\text{ MHz}148.0 MHz. Within this band, telemetry channels are allocated slots with a standard spacing of 100 kHz100\text{ kHz}100 kHz.

Calculate the maximum number of telemetry channels that can be accommodated in this frequency range.

[2]
c.

A telemetry transmitter on one of the balloons broadcasts an FM signal with a maximum modulating data frequency of 7 kHz7\text{ kHz}7 kHz and a peak frequency deviation of ±45 kHz\pm 45\text{ kHz}±45 kHz.

Determine, using Carson's Rule, whether this transmission will fit within its allocated 100 kHz100\text{ kHz}100 kHz channel spacing without spilling into adjacent channels.

[3]

Data communication systems (A-level only) Questions

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