IBASE SI-18 - Manual (Page 16)

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4. Use a screw driver to pinch out the knock-out metal-plate of the SMA antenna
hole from point B. To avoid any metal falling into the system, pinch out the
metal-cover with the same direction as shown in the following figure.
5. Hold WLAN antenna SMA head carefully and through the hole on I/O wall.
Beware the direction of SMA head with the hole, there only has one direction can
pass through the antenna hole. And there has one washer shall be put on head
before through into the hole, point C.
B
C