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RM-824; RM-825; RM-826
System Module
The RF module receives and demodulates the radio frequency signals from the base station and transmits
the modulated RF signals to the base station. It consists of the following functional sub-modules: Receiver,
Frequency Synthesizer and Transmitter.
Frequency mappings
GSM850 frequencies
Channel
TX Freq
128
824.2
190
836.6
251
848.8
GSM900 frequencies
Channel
TX Freq
975
880.2
37
897.4
Issue 2
Figure 56 RF block diagram
RX Freq
(MHz)
(MHz)
869.2
881.6
893.8
RX Freq
(MHz)
(MHz)
925.2
942.4
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TX VCO Freq
RX VCO Freq
(MHz)
(MHz)
3296.8
3476.8
3346.4
3526.4
3395.2
3575.2
TX VCO Freq
RX VCO Freq
(MHz)
(MHz)
3520.8
3700.8
3589.6
3769.6
Page 6 – 27
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