User Guide
Table Of Contents
- 7 - RF Description & Troubleshooting
- 1. RF Description and Troubleshooting
- 2. RF Implementation in NHL-12
- 3. Introduction to RF troubleshooting
- 4. Receiver Description and Troubleshooting
- 5. Transmitter Description and Troubleshooting
- 6. Additional Information on EDGE Troubleshooting
- 7. Synthesizer Description and Troubleshooting
- BACK TO MAIN PAGE
NHL-12
Nokia Customer Care 7 - RF Description & Troubleshooting
6 COMPANY CONFIDENTIAL Issue 2 10/2004
Copyright © 2004 Nokia. All Rights Reserved.
RF circuitry is located on one side of the 8-layer PWB.
The possible EMC leakage is prevented by using metal cans. The RF circuits are separated
into three blocks:
• PA, antenna switch module, Rx 1900 LNA, Rx 1900 SAW filter, Rx 1900 trans-
former balun, Tx 1800/1900 transformer balun and Tx 850 SAW filter
• Helgo RF IC, VCTCXO, Rx 850 SAW filter and Rx 1800 SAW filter
• VCO and transformer balun for VCO
The RF transmission lines constitute of striplines and microstriplines after PA.
The baseband circuitry is located on one side of the board, which is shielded with a metallized
frame and ground plane of the UI board.
■ RF measurement points
Figure 2: RF measurement points - Bottom