Ground Connection; Shielding - Sierra Wireless MC5725 Hardware Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
16
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Minimize RF cable losses to the antenna; the recommended
•
maximum cable loss for antenna cabling is 0.5 dB.
Figure 3-1: Antenna connection points and mounting holes

Ground connection

When connecting the module to system ground:
Prevent noise leakage by establishing a very good ground
•
connection to the module through the host connector.
Connect to system ground using the two mounting holes at
•
the top of the module (as shown in Figure 3‐1).
Minimize ground noise leakage into the RF.
•
Depending on the host board design, noise could potentially
be coupled to the module from the host board. This is
mainly an issue for host designs that have signals traveling
along the length of the module, or circuitry operating at
both ends of the module interconnects.

Shielding

The module is fully shielded to protect against EMI and to
ensure compliance with FCC Part 15 ‐ "Radio Frequency
Devices" (or equivalent regulations in other jurisdictions).
Proprietary and Confidential 2130114