User Guide

Checking antenna functionality

The main antenna has one antenna: GSM.

In the GSM antenna, there is one Feed and two GND contacts.

The contacts of the GSM antenna are separated in the (RDC = 0 ohm) short-circuit.

Figure 50 Main antenna

The antenna is functioning normally when the contacts function (RDC = 0 ohm) and the antenna is visually

intact.

BT antenna

BT antenna is a conventional PWB antenna. BT antenna can be damaged only by ripping the antenna feeding

capacitor off.

RF tunings

Introduction to RF tunings

Important: Only perform RF tunings if:

• one or more of the RF components is changed

• flash Memory chip is changed or otherwise corrupted.

RF calibration is always performed with the help of a product-specific module jig, never with an RF coupler.

Using an RF coupler in the calibration phase will cause a complete mistuning of the RF side.

Important: After RF component changes, always use autotuning. Manual tunings are only required

in rare cases.

Cable and adapter losses

RF cables and adapters have some losses. They have to be taken in account when the phone is tuned. As all

the RF losses are frequency dependent, the user have to be very careful and understand the measurement

setup. In the following table there are RF attenuations of the module jig:

Band Attenuation

GSM850 0.2 dB

GSM900 0.2 dB

GSM1800 0.3 dB

GSM1900 0.3 dB

RM-170; RM-171

Nokia Customer Care RF Troubleshooting and Manual Tuning Guide

Page 7 –18 COMPANY CONFIDENTIAL Issue 1