Incorrect Rssi Readings; Agc Voltage Calibration; Nominal Agc Data - Tait TM9100 Service Manual

10.4

Incorrect RSSI Readings

If the RSSI readings are incorrect, the receiver calibration is suspect.
Introduction
There are four tasks, which cover the four types of settings concerned:
If the receiver is properly calibrated but the fault persists, then the receiver
sensitivity is suspect.
The first settings to check concern the AGC voltage calibration.
Task 10 —
AGC Voltage
Calibration
1.
2.
3.
4.
5.
6.
Table 10.3 Nominal AGC data
Parameter
AGC0
AGC1
AGC2
AGC0
AGC1
AGC2
AGC0
AGC1
AGC2
TM9100 Service Manual
© Tait Electronics Limited August 2005
Task

10: AGC voltage calibration

Task 11: FE tune BPF settings
Task 12: RSSI delta gain
Task 13: AGC delta gain
In the calibration application open the "Raw Data" page and click the
"Receiver" tab.
Note the settings listed in the "AGC Voltage Cal Pts" field. The nominal
settings should be as listed in
If the settings are correct, go to
Recalibrate the receiver and check the settings again.
If the settings are now correct, go to
Task 1 and check the receiver sensitivity.
Check if the RSSI fault has been removed. If it has, go to
Tasks" on page 147. If it has not, go to
B1 band
1725 ± 40
1850 ± 40
2000 ± 50
H5 band
1860 ± 40
2040 ± 40
2200 ± 50
Standard radio
–50
–60
–68
Table 10.3.
Task 11. If they are not, go to
Step 6. If they are not, go to
Task 11.
AGC voltage (mV)
AGC voltage (mV)
H6 band
1870 ± 40
2050 ± 40
2220 ± 50
Receiver input power (dBm)
Trigger-base radio
–44
–54
–62
Receiver Fault Finding
Step 4.
"Final
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