Checking Antenna Functionality; Main Antenna Functionality - Nokia n81 Service Manual

RM-179; RM-223
RF troubleshooting

Checking antenna functionality

The device has a main GSM and WCDMA 2100 antenna. The main antenna is the visible gold structure on the
black plastic carrier. The main antenna has six connections to the PWB via C-clips. The main antenna consist
of two radiator structures for quadband GSM/ WCDMA 2100 TX and a WCDMA 2100 RX.
The BT/Wlan antenna is the visible flexid PWB covered with black paint. The antenna is connected to the PWB
with two C-clips.

Main antenna functionality

The main antenna is an active antenna. It is functioning normally when the feeds and the GND have proper
connection to the PWB.
The radiator is made from a durable gold colored conductive layer. This layer has to be visually intact.
The main antenna functionality must be checked by measuring the transmitted power with an RF coupler at
GSM 1800 channel 610 and GSM 900 channel 37. The test in GSM 1800 and GSM 900 take care that the active
path (XGND) of the antenna is working.
Figure 35 Main antenna
Issue 1 COMPANY CONFIDENTIAL Page 4 –25
Copyright © 2007 Nokia. All rights reserved.