Meaning
Verification protocol required when a certified radio module is added to a final end-product to confirm the assembly still meets emission limits. Performing host retesting ensures that the mechanical housing, internal cables, and power supplies do not create new sources of interference. The process validates the compliance of the entire system rather than just the radio component.
Integration Check
Placement of the antenna and the routing of high speed data lines influence the radiated performance of the finished product. Unintended coupling between the module and the host circuit board often creates spurious signals.
Spurious Emission
Measurements in an anechoic chamber identify any energy discharged at frequencies outside the intended operating band. The test laboratory checks the harmonics of the carrier and the local oscillator to ensure they remain below the legal limit. If the host enclosure is metallic, it may trap energy and create resonant peaks that were not present when the module was tested alone.
Testing Frequency
Verification is mandatory whenever the physical configuration of the radio or the antenna system is modified. A host manufacturer must maintain a record of these tests to support their declaration of conformity. This evidence protects the company during market surveillance by showing that the product meets the technical requirements of the grant.
