User Guide

PAMS

Technical Documentation

NSE–8/9

Troubleshooting

Page 36

Issue 1 07/99

4. GSM Transmitter

4.1 General instructions for GSM TX troubleshooting

Apply a RF–cable to the MJS–13 RF–connector to allow the transmitted

signal act as normal. RF–cable should be connected to measurement

equipment or to at least a 10–dB attenuator, otherwise the PA may be

damaged.

Start WinTesla–Service–Software and

Select: P

roduct Alt+p

and b

SM g

Select: Te

sting Alt+e

F Controls r

Power Level : BASE Alt+x, b

TX C

ontinous Alt+c

TX D

ata Type: Random Alt+d, r

Chan

nel: 60 Alt+n, 60

pply Alt+a

4.2 . Path of the transmitted GSM signal

This path defines the general route of the transmitted signal:

COBBA_GJP (N200), SUMMA(N700), 116 MHz Filter (L703, L704, L708),

CRFU3 (Upconverter N600), GSM Filter (Z601), MMIC PA (N500),

Directional Coupler (L500), Duplexer (Z500), Diplexer (Z503), Antenna.

The related component number(s) are defined inside (.).

There is also power detection (V500) and power control circuits inside

SUMMA for transmitter power control.