User Guide

RH-25
System Module CCS Technical Documentation
Page 34 ©Nokia Corporation Confidential Issue 1 10/2003
Table 8: TDMA 1900 TX
*** 26.3 dBm for channel 1000 and 1998; 27.0 dBm for channel 2.
Antenna
The RH-25 antenna solution is an internal dual resonance PIFA antenna. This antenna
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-25 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.
Power
level
RF power at external
Antenna Pad (dBm)
Tuning target
tolerant (dB)
Testing limits (dB)
2 26.3*** +/- 0.25 0.5/-0.5
3 23.3 +/-0.5 +/-2.0
4 19.3 +/-0.5 +/-2.0
5 15.3 +/-0.5 +/-2.0
6 11.3 +/-0.5 +/-2.0
7 7.3 +/-0.5 +/-2.0
8 3.3 +/-0.5 +/-2.0
9 -0.7 +/-0.5 +/-2.0
10 -4.7 +/-0.5 +/-2.0