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Describe the functions of base stations and the cellular exchange when a mobile phone is switched on and before a call is made.
Physics 9702 · AS & A Level · Characteristics of alternating currents
Characteristics of alternating currents — practice question
At its most basic level, a mobile phone handset is a radio transmitter and receiver.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Handset sends an identification signal to base stations; base station passes the signal to the cellular exchange, which selects the strongest signal and carrier frequency.” …
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