NEC MPI4E RaspberryPi 4 System on a Chip Solution

Raspberry Pi Compute Module Setup Guide - Page 77

For MPI4E.

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©2021 Sharp NEC Display Solutions, Ltd. Page 77 of 86
Confirm that the Wi-Fi drivers are available and have been enabled in the operating system
being used. Raspberry Pi OS normally includes these drivers, but the Wi-Fi functionality must be
manually configured and enabled.
Problem: Poor or no Wi-Fi signal but Wi-Fi is enabled
Solution:
Confirm that the external antenna is selected in software see Section 12.4 on page 76.
Confirm the external antenna is correctly connected to the SMA type socket on the bracket of
the Interface Board.
Check the internal coax cable for kinks or other damage.
Confirm that the U.FL connector on the coax cable is correctly connected to the U.FL antenna
receptacle on the Compute Module.
Check for sources of external interference.
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