User Guide

After Sales

Technical Documentation

PC Locals / NAM Prog / Tuning Instructions

Original, 09/94 Page 21

Tuning Menu

This menu contains the commands required for tuning the phone.

Selecting the Tuning menu opens a sub–menu from where the desired

Tuning parameters can be selected. After you select a tuning parameter

from the sub–menu, a tuning dialogue box will be opened and all

necessary settings for the phone will be done automatically.

Initialize Local Mode

This command reactivates the Locals mode of the phone.

Local Mode Activation

1. Select option 1 from the Tuning menu

2. The text ” Local ” will appear in the phone’s display

PA Bias Calibration

This command allows you to tune the two stages of the TX power

amplifier separately to achieve maximum efficiency.

Procedure

1. Select Tuning / PA Bias Calibration

2. The PA Bias Calibration procedure is as follows:

a) Enter the phone current, as measured on a meter, into the Supply

Current Text Box and then select Next Stage.

b) Follow the on–screen menu instructions to set PA Driver Bias Value

and select Next Stage. Repeat this process for PA O/P Bias Value.

c) Enter the new value to EEPROM by pressing ENTER on the

keyboard or clicking on the corresponding button using the mouse.

VCTCXO Alignment

This command is used to tune the VCTCXO frequency of the phone. This

command will tune the phone to channel 1988 and activate the

transmitter. Use an accurate frequency counter when measuring the

resultant output. Please note that the VCTCXO should only be aligned

using PC Locals. No attempt should be made to physically tune the

device using the trimming capacitor.

Tuning Procedure

1. Select Tuning / VCTCXO Alignment

2. Adjust Tx carrier frequency (F

) to within +/– 50Hz

3. Enter the new value to EEPROM by pressing ENTER on the keyboard

or clicking on the corresponding button using the mouse.