User Guide

CCS Technical Documentation Troubleshooting — RF
RH-17
Issue 1 04/2003 Nokia Corporation Confidential Page 41
Troubleshooting:
Check Alfred and supporting components, reference Table 9.
Final UI test: Rho
Rho is a measure of CDMA transmit signal quality which encompasses other transmitter
indicators such as phase error and magnitude error. Rho is measured with the phone in a
phone call, and is read directly from the call box. Rho is measured with sector power
= -75 dBm. If Rho fails, first check the signal purity of the LO's. Check synthesizer com-
ponents and power supply decoupling. Reference Table 2.
Final UI test: Frame Error Rate (FER)
This measurement, also made in a phone call, measures the frame errors of the receiver
in CDMA mode. A low amplitude signal (typically at receiver sensitivity level of -
104.0 dBm) is injected into the receiver, and the FER is recorded. FER is measured in per-
centage, and 0.5 % or lower is passing (w/ 95% confidence). Failures are most often
caused by excess loss/insufficient gain in the receiver chain, (and sometimes by excess
noise in the receiver). Check for correct signal levels and AGC values/voltages as
described in Tables 8-12.
Final UI test: SINAD
SINAD (Signal-to-Noise-and-Distortion) is similar to a sensitivity/FER measurement for
CDMA, but is used in AMPS. A low level signal (typically at sensitivity level of -
116.0 dBm) is injected into the receiver, and SINAD is read off the call box, with 12 dB as
the passing limit. Check Tables 9-11.
MidLow 245
Mid 384
MidHigh 512
HighMid 660
High 799
Channel Cell