State one advantage of using frequency modulation (FM) rather than amplitude modulation (AM) for radio communications.
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.
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.
22 exam-style questions on AQA A Level Physics Data communication systems (A-level only), covering Principles of communication systems (A-level only), Transmission media (A-level only), Time-division multiplexing (A-level only), and Amplitude (AM) and frequency modulation (FM) techniques (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.