User Guide

RH-17
Troubleshooting — RF CCS Technical Documentation
Page 40 Nokia Corporation Confidential Issue 1 04/2003
same amplitude on Batman output, therefore if the AGC value is larger than normal,
then the AGC is compensating for loss in the chain prior to the variable gain amplifier.
After checking RSSI and AGC value, if it is still necessary to probe to pinpoint the source
of the error, use the AMPS probing Tables 9 through 11.
Test 178 - 179 TN LNA AMPS LowGain (or HighGain)
Description:
This tuning records RxdBCtr (which is automatically adjusted to produce the same ampli-
tude on the receiver output no matter what the input is) for the receiver with the LNA in
highgain mode, and again with the LNA in lowgain mode. For AMPS this is done only on
the center channel.
Explanation of Result:
The result is a value of RxdBCtr.
Manual Verification:
Using Phoenix, choose this tuning in the RF Tuning window. Inject a CW signal that is
10 kHz offset from the center frequency of the channel that is being tuned. For AMPS,
set the amplitude to -65 dBm. Record RxdBCtr, which is returned from Phoenix in the
lowest field in the RF Tuning window.
Troubleshooting:
Check Alfred and supporting components, reference Table 9.
Test 126 - 139 TN LNA CELL LowGain (or HighGain) LO (or LM, ML, MD, MH, HM, HI)
Description:
This tuning records RxdBCtr (which is automatically adjusted to produce the same ampli-
tude on the receiver output no matter what the input is) for the receiver with the LNA in
highgain mode, and again with the LNA in lowgain mode. For Cell this is done over sev-
eral channels.
Explanation of Result:
The result is a value of RxdBCtr.
Manual Verification:
Using Phoenix, choose this tuning in the RF Tuning window. Inject a CW signal that is
10 kHz offset from the center frequency of the channel that is being tuned. For Cell set it
to -95 dBm. Record RxdBCtr, which is returned from Phoenix in the lowest field in the RF
Tuning window.
Channel Cell
Low 991
LowMid 107