User Guide

CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 35
Troubleshooting:
If the maximum cannot be reached, either a component in the transmitter has too much
loss, or not enough gain. Troubleshoot the Cell transmitter Table 2, with the phone set to
the same channel as the failed channel.
Test 76 - 82 TN TX Limiting Po IS2K Cell: Low channel (or LowMid, MidLow, Mid, MidHigh,
HighMid or High channel)
Description:
This tuning provides an upper limit on the transmit power while in Cell mode with
CDMA2000 modulation. The reason for this is to ensure that the phone never violates the
SAR (Specific Absorption Ratio) limit, which is a health and safety specification that lim-
its the amount of radiation near the user's head. The phone is set to transmit and Txd-
BCtr is adjusted for the maximum transmit power.
Explanation of Result:
The result is a power level in dBm, which is the maximum allowed. This is done on each
of the seven channels.
Manual Verification:
Using Phoenix, set the phone to local mode, then turn on the Cell transmitter set to each
of the channels in the list below. Set modulation to C2k voice using CDMA Control.
Using the RF Tuning window, adjust TX RF AGC in PDM Control "value" until the TX
power, measured on the RF connector with a spectrum analyzer, is within the limits on
each of the channels below.
Troubleshooting:
If the maximum cannot be reached, either a component in the transmitter has too much
loss, or not enough gain. Troubleshoot the Cell transmitter Table 2, with the phone set to
the same channel as the failed channel.
Channel Cell Frequency Range for output power, in dB
Low 991 824.04 MHz 23.3 to 23.5 dBm
LowMid 107 828.21 MHz 23.6 to 23.8 dBm
MidLow 245 832.35 MHz 24.0 to 24.2 dBm
Mid 384 836.52 MHz 24.4 to 24.6 dBm
MidHigh 512 840.36 MHz 24.3 to 24.5 dBm
HighMid 660 844.80 MHz 24.2 to 24.4 dBm
High 799 848.97 MHz 24.1 to 24.3 dBm