Nokia 3105 Servicehandbuch

CCS Technical Documentation

Troubleshooting - RF

RH-48

Issue 1 11/2003

© 2003 Nokia Corporation         Confidential

Page 29

Figure 18 illustrates a simplified block diagram of the receiver. The diagram shows every 
major component from the antenna port to the I and Q baseband.

Note: See the Schematics chapter for an RH-48 receiver schematic.

Faulty synthesizers can cause both Rx and Tx failures during tuning, in addition to the 
VCTCXO tuning. The following synthesizers are incorporated into the RH-48:

•  UHF (cell) PLL inside Jedi IC (N601)

•  Tx VHF (457.2MHz) with PLL in Jedi IC

•  Rx VHF (367.2MHz) with PLL in Yoda IC

-95

0..633

Note the reduced delta because the LNA is 
switched on

-100

0.594

-105

0.524

-107

0.470