State one advantage of using frequency modulation (FM) rather than amplitude modulation (AM) for radio communications in environments with high levels of electromagnetic interference.
An emergency services radio network operating in the VHF band has an allocated frequency range from 168.0 MHz168.0\text{ MHz}168.0 MHz to 174.0 MHz174.0\text{ MHz}174.0 MHz. The FM channels within this band are allocated with a channel spacing of 150 kHz150\text{ kHz}150 kHz.
Calculate the maximum number of emergency transmission channels that can be accommodated within this frequency range.
A search-and-rescue team transmits an FM voice signal within this network with a maximum audio frequency of 6 kHz6\text{ kHz}6 kHz and a maximum frequency deviation of ±65 kHz\pm 65\text{ kHz}±65 kHz.
Determine, using Carson's Rule, whether this transmission fits within the allocated 150 kHz150\text{ kHz}150 kHz channel spacing.
