User Guide

RH-27
Troubleshooting - RF (Part 1) CCS Technical Documentation
Page 20 ©2003 Nokia Corporation Confidential Issue 1 11/2003
Rx PDM Characteristic Curve (Phone Call Mode)
Key RF Performance Tests in Call Mode
Tx Tests
Max Limiting Power
Set the sector power to -95dBm or lower and set the Reverse Power control bits in the
8960 to always up. This is the maximum limiting power that the phone can provide.
Check phone’s limiting power vs. channels and see whether they are accurate to the lim-
its. (Be sure to account for cable loss.)
Waveform Quality (rho)
This can be measured on the 8960 call box. Always measure at maximum power; should
be greater than 0.97. The frequency error should be within +/-150Hz.
Spurious Emissions (ACPR)
ACPR can be measured on the 8960 call box. Always measure at maximum power. Limits
for +/-885kHz and 1.98MHz are lower than at least -42dBc and -54dBc.
Rx Tests
Rx Sensitivity
Measure this on the 8960 call box. Always measure at max power. Rx sensitivity is
defined as minimum sector power for 0.5% FER. Usually the result is better than
-107dBm. (Be sure to account for cable loss.)
Receive Signal Strength Indicator (RSSI)
When in a call, you can verify the receiver received level by using the Phoenix RF AGC
component. The RSSI reading should track with the call box sector power reading within
Rx PDM AGC Plots in a Call
-300
-200
-100
0
100
200
300
400
-110 -100 -90 -80 -70 -60 -50 -40 -30 -20
Rx Power (dBm)
PDM
Sector Power (Hi to Lo)
Sector Power (Lo to Hi)
This is a typical Rx AGC Curve that
This is a typical Rx AGC Curve that
sweeping from
sweeping from
–
–
25 ~
25 ~
-
-
109
109
dBm
dBm
Note that the abrupt change of
Note that the abrupt change of
PDM is due to the LNA gain state
PDM is due to the LNA gain state
switched between Hi and Lo gains
switched between Hi and Lo gains