Frequency Plan - Nokia RM-132 Service Manual & Parts Manual

RM-132; RM-133
System Module Nokia Customer Care
Figure 97 RM-132 RF block diagram
Single feed switch
In RM-133, the single feed antenna switch directs the received signal from the multiband antennas to either
the GSM or the WCDMA section. In the case of RM-132, the WCDMA switch output is terminated by a matched
load. The GSM section covers the four GSM bands USGSM850, EGSM900, GSM1800 and the GSM1900. The WCDMA
section operates at the 2100 MHz band. In the transmit direction the switch takes the transmit signal from
either the GSM band or the WCDMA band to the single feed multiband antenna.

Frequency plan

Both, the receiver and the transmitter, are based on direct conversion architecture. The VCOs operate at the
channel frequency multiplied by two or four depending on the band of operation. This means that the
modulated baseband signals are directly converted up to the transmission frequency and the received RF
signals directly down to the baseband frequency.
Issue 1 COMPANY CONFIDENTIAL Page 9 –35
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