User Guide

PAMS
Technical Documentation
NME–3
Service Software Instructions
Page 10
Issue 1 10/99
Tuning Steps
1. RX Calibration (AGC + AFC)
Procedure
Follow the steps described in chapter ”Service Software Instructions”
section ”RX calibration... command”.
Software reports the following:
AFC init value
AFC slope
PSW slope
AGC DAC values and the corresponding voltages for each gain step (0 -
57 dB)
Limits for the reported values
If everything went well the reported values should approximately be the
following:
Parameter Low limit High limit
AFC init value –80 80
AFC slope 135 230
PSW slope 250 350
AGC 0 dB 440 740
AGC 57 dB 60 360
Difference between the two neighbour
AGC steps
10 20
Troubleshooting
If the calibration does not succeed the software normally reports ”Unable
to read data from phone” or ”Failed to set high reference” or ”Failed to set
low reference”.
In this case check first the basic functionality of the receiver chain: RF
generator frequency set as in the calibration and level for example to the
high reference value.
Then go to the RSSI reading menu (under RF controls). If the reading is
very low there is something broken in the receiver and must be found by
measuring voltages and signal levels at different places (information of
these can be found elsewhere in this manual).