User's Manual

page 20/24
Note d’étude / Technical document : URDx– OTL 5635.1– 007 / 70 230 Edition 03
Document Sagem Communications Reproduction et divulgation interdites
Sagem Communications document. Reproduction and disclosure prohibited
• Put capacitor 100nF on battery (not on charger), or better put varistor or ESD diode in parallel on battery and
charger wires and on all wires on bottom connector
• Uncouple microphone and speaker by putting capacitor or varistor in parallel of each wire of these
devices
5.2 ESD FEATURES
The HiLo module can hold 2KV on each pin and on RF connector.
6. RADIO INTEGRATION
6.1 ANTENNA
- Antenna contact
• 50Ω line matching (between module and MMI board, and with RF test point)
• Sagem communications strongly recommends soldering the spring contact on the whole surface instead of
only 2 points
TBD
TBD
TBD
HiLo
50 ohm
Figure 18: Antenna connection
- Keep matching circuit on MMI board but with direct connection in the first step – it could be necessary to make
some adjustment later, during RF qualification stage
- The selected antenna must comply with FCC RF exposure limits in GSM850 and PCS1900 band:
GSM850: MPE < 0.55mW/cm
2
(Distance is 20 cm)
PCS1900: ERP < 3W