Rx Receiving Section of Nokia 3310-3315 Phones:
Beginning from Antenna Switch Z502 : Antenna receives the incoming signal Rx. This signal contains the required signals as well as signals which are not required or not desired to be present or just UNWANTED signals in simple words. This unwanted signals are simply trapped and sent to ground by the coil L510. In this way the unwanted signals are blocked here by the coil L510 and so are prevented from proceeding further. The Capacitor C593 picks up the desired signal and passes them on further to the Antenna Switch Z502 (at Pin No.4).So, the desired RF signal is passed on to the Antenna Switch, which processes it and separates the 2 different frequency signals received thus and provides them separately at it’s output pins 14 & 12. The 900 MHz signal is made available at it’s pin no.14 and 1800MHz signal is made available at it’s pin no.12 as shown in the diagram below
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