User Guide

Figure 64 RM-24 antenna

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

intact.

RF tunings

Introduction to RF tunings

Phone RF is tuned in production. There is no reason to do the re-calibration unless:

• One or more of the RF components is changed

• FLASH memory chip (D3000) is changed or otherwise corrupted.

Note: 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 into 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. The following table presents the RF attenuations of the product-specific module jig:

Band Attenuation

GSM850 0.3 dB

GSM900 0.3 dB

GSM1800 0.4 dB

GSM1900 0.4 dB

WCDMA 2100 0.4 dB

RM-10;RM-24

RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Issue 1 COMPANY CONFIDENTIAL Page 7 –19