User Guide

PAMS
Technical Documentation
WinTesla User Guide
NHD–4
Page 49
Original 11/97
AGC Tuning
The purpose of this tuning operation is to determines the difference
between the received CDMA signal power and the transmit CDMA signal
power of the phone when it is in the Open–Loop AGC mode.
This tuning is needed if any component in the receiver or transmitter chain
is replaced.
Description of Tuning
This tuning determines the difference between the received CDMA signal
power and the transmit CDMA signal power of the phone when it is in the
Open–Loop AGC mode. This delta value is better known as CloopRef.
To do this a –73 dBm CW tone is fed into the CDMA receiver and the
CloopRef value is adjusted in software until the CDMA transmitter output
bandpower measures 0.0 dBm.
AGC calibration steps & equipment:
– Using the JBS–7 service jig, replace the standard battery of the phone
with the dummy battery BTS–4.
– Apply +6.0 V to dummy battery.
– Select ” Tuning – AGC”
– This tuning is done in duplex mode. Therefore the need to inject a Re-
ceive signal, while measuring a transmitt signal is required.
– Inject a signal at the antenna port as described by the tuning screen.
– Adjust the output power to obtain the specified target level.
– Press <save & exit> to store value to EEPROM or <cancel> to exit
without saving.