User Guide

RH-27
System Module CCS Technical Documentation
Page 32 © 2003 Nokia Corporation Confidential Issue 1 11/2003
has a common feeding point for both antenna radiators, which results in the need for
diplexer. In a singleband transciever, a SMD-compatible through chip can be used..
Software Compensations
The following software compensations are required:
• Power levels temperature compensation
• Power levels channel compensation
• Power level reduction due to low battery voltage
• TX Power Up/Down ramps
• PA's bias reference currents vs. power, temp and operation mode
• RX IQ DC offsets
• RSSI channel compensation
• RSSI temperature compensation
RF Frequency Plan
The RH-27 frequency plan is shown in the following figure. A 19.44 MHz VCTCXO is used
for UHF and VHF PLLs and as a baseband clock signal. All RF locals are generated in PLLs.
Figure 18: RH-27 frequency plan
UHF LO
CELL 997.14 - 1022.07 MHz, 30 kHz Step
PCS 2058.10 - 2118.05 MHz, 50 kHz Step
TX Block
RX Block
TX VHF LO
CELL 346.2 MHz
PCS 416.2 MHz
°0
°90
2
1
TX Q
TX I
RX VHF LO
CELL 256.2 MHz
PCS 256.2 MHz
°0
°90
2
1
RX Q
RX I
TX IF
CELL 173.6 MHz
PCS 208.1 MHz
RX IF
CELL 128.1 MHz
PCS 128.1 MHz
824.04 - 848.97 MHz
30 kHz Steps
1850.00 - 1909.95 MHz
50 kHz Steps
PCS
CELL
1930.00 - 1989.95 MHz
50 kHz Steps
869.04 - 893.97 MHz
30 kHz Steps
PCS
CELL