User Guide

PAMS
Technical Documentation
WinTesla User Guide
NHD–4
Page 32
Original 11/97
TX Output Power
This adjustment loads the power levels of the phone transmitter into
EEPROM. When doing this, a power meter must be used.
This tuning is needed if CDRFI (N700), duplex filter, power RF transistors
or power control parts are replaced
Description of Tuning
This tuning sets the AMPS transmitter power levels 2–7 to the required
power output. To perform this tuning the phone is placed in AMPS Mode
and the carrier is turned on. AMPS TX power control on the 2180 is done
by adjusting the TXI_REF PDM.
Power levels programming:
– 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 – TX power level”
– Connect power meter to antenna via the phone’s bottom connector.
– Adjust the tuning value with the arrow keys (fine tuning) or with PgUp
and PgDn–keys (coarse tuning) until the desired output power is
reached. Tuning starts from the highest power level.
Note: There is a little cable loss between the antenna connector and the RF power
meter. The total attenuation of 1 meter long RG–58 cable and the service box is about
0.7 dB. Please take this into account.
Power
level
Target Power level
values (milliWatts)
Example value
A/D converter
2 26.8 dB (479 mW) 143
3 22.8 dB (239.9 mW) 0
4 18.8 dB (95.5 mW) –40
5 14.8 dB (38.0 mW) –89
6 10.8 dB (15.1 mW) –129
7 6.8 dB (6.03 mW) –161
– Use the <TAB> key to move to tune the next power level.
– Press <Save & exit> to store calculated values to the phone and exit
or <Close> to exit without storing.