V1.0 Page 11 of 38 ICM MP CC ST
A35-A36-A40 Company Confidential 09/01
4.3 Antenna switch (electrical)
Internal > Receiver/Transmitter <> GSM900/1800
The Axx mobile has in opposite to P35 only one antenna switch (electrical). Notes
The electrical antenna switch (Diplexer Z503) is used for the differentiation
between the receiving and transmitting signals, just like the differentiation
between GSM900 and GSM1800.
To do so the transistors V506,V507,V509 and V510 are used to switch the
diplexer signals VC1–VC4 as required.
Please note, that Axx mobiles have no external antenna connector.
The matrix below shows the different conditions at the diplexer and the
accompanying signals.
from PA
to PCN receiver
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