User Guide

PAMS
Technical Documentation
WinTesla User Guide
NHD–4
Page 48
Original 11/97
TX Slope Tuning
Definition of Tuning
This tuning determines the linear relationship, or slope, between a change
in the output bandpower of the CDMA TX and a change in the TxDac. To
do this the CDMA transmitter is turned on and set to an output bandpower
corresponding to a TxDac value referred to as TxDac1. The resultant
bandpower is read and stored as BPOW1. Next, the TxDac is
decremented by a fixed amount that should result in approximately 32 dB
less output bandpower than the initial state. This TxDac value is called
TxDac2. Again the output bandpower is read, and stored as BPOW2.
From this data the TX Slope is determined. It is then manipulated
mathematically so that the TX slope equals “1”. When it does, a one bit
change in the TxDac will result in a 1/8 dB change in output power. The
following graph should help describe the TX Slope concept.
T X Slope
TX Slope
TxDac1
~
32 dB
TxDac2
BPOW2
BPOW1
TX Output Power (dBm)
Figure 16. TX Slope
– Manually enter the new TX Power measurement into the BPOW2 loca-
tion. This value will be approximately minus 32 dB (–32 dB).
– Press <save & exit> to store value to EEPROM or <cancel> to exit
without saving.