User Guide

PWB outline

Figure 10 PWB top side component placement

RF description

Frequency band, power and multi-slot class

The requirements leads to the specification in the table below:

Table 11 Frequency bands and TX power class

System Frequency band TX power class

GSM900 Tx: 880 – 915 MHz 4 (33dBm)

Rx: 925 – 960 MHz

GSM1800 Tx: 1710 – 1785 MHz 1 (30dBm)

Rx: 1805 – 1880 MHz

Table 12 Multi-slot class

Multislot Class

GPRS MSC 6 (up to 3+1 and 2+2)

Transmitter - general description

The transmitter has 2 separate parallel paths one covering the 900 band and the other the 1800 band. The

transmitter operates in GMSK mode only. The power level control circuitry is integrated in the front-end module.

Each path of the transmitter is composed of a baseband lowpass filter for the I/Q signals and a quadrature direct

modulator integrated in PMB3258. At the modulator’s output there is a bandpass filter for each band (so-called

H3 filter) and a balun transformer to convert the differential output signal from the modulator into a single-

ended 50 ohm signal. This signal is fed into the input of the PA. The two power amplifiers and the antenna

switch are located in a single module with built-in power control loop.

RH-70

System module Nokia Customer Care

9243364 (Issue 1, Part 3) Company Confidential Page 1–21