RF guidelines
Since the matching is different for the external antenna at the LGA pad, this RF output power
calibration in the firmware is not valid and a new calibration data should be generated based on
matching from the LGA pad to an external antenna. When the current calibration data based on the
U.FL connector is applied to the external antenna as routed on the SBC Pro carrier board from Digi,
the RF power levels are slightly lower, and also waved along frequency. If applied on another external
antenna on another carrier board design, the resulting RF power levels will depend directly on the
implemented matching network.
Regulations
Both antennas have been certified compliant, assuming the external is connected as in the SBC Pro
carrier board from Digi. For an external antenna on another carrier board design to remain compliant,
the same design approach must be followed to reduce conformance testing to a spot-check.
Certification testing can also be reduced by using already-approved antennas by Digi. You can also use
antennas of the same kind with equal or less gain to reduce testing.
ConnectCore 6UL Hardware Design Guidelines
Regulations
14
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