User's Manual

Page 25 of 187
TECHNICAL MANUAL
Telit GM862 PCS
Tri Band GPRS Data Terminal System Rev.1
1.16 Mounting the GM862-PCS on your Board
In order to electrically connect your board to the Telit GM862-PCS module, use a CSTP 2x25 pin
vertical SMD SCH–SCH Molex 53748 - 0504 (female, low profile) as a counterpart to the CSTP
50 pin vertical SMD Molex 52991–0508 (male) of your Telit GM862-PCS module.
When mounting the Telit GM862-PCS module on your board, take care of soldering the GM862-
PCS shielding reeds on a ground plane or signal.
NOTE: be very careful when connecting the Telit GM862-PCS module RF connector. The Telit
GM862-PCS module RF connector can be damaged if not connected with the proper antenna
RF connector. The minimum number of insertion cycles is recommended.
1.16.1 Antenna Coaxial cable fixing
The following constraints must be respected in the Telit GM862-PCS antenna cable connection:
- The fixing point of the coaxial cable must not be placed too close to the antenna connector,
leaving at least 30mm of flexible cable between the fixed point and the plug end.
- The fixing point must be at the same height of the antenna connector, eventually using a wedge
between the PCB and the cable if it is directly fixed to the PCB.
- The flexible cable must never be bent with a radius lower than 25mm (RG174 cable).
- The cable must be a RG174 type or more flexible ones.
The following pictures explain these constraints:
- Angle connector fixing example -