Evaluation Protocols for Unlicensed Radio Module Cross Border Certification Schemes
Cross-border radio module schemes demand host-level verification, strict trace layout compliance, and targeted local filing sequencing to secure market access.
Conducted Power Mask
Meaning
Boundary limits applied to the output spectrum of a transmitter ensure that out-of-band emissions do not disrupt adjacent communications. A conducted power mask establishes the maximum allowable signal level across a range of offset frequencies relative to the carrier frequency. Compliance prevents interference in neighbouring channels by confining the transmitted energy.
Spectral Boundary
Compliance verification occurs at the antenna port of the RF module during design approval. The conducted power mask defines the power envelope that the transmitter must not exceed under any modulation state. Measurements are recorded using a calibrated spectrum analyser.
Receiver Protection
Preventing interference to adjacent receivers is the primary engineering objective of these transmitter limits. When a module operates close to another receiver, the conducted power mask acts as a barrier against spectral regrowth and intermodulation distortion. This safeguard is necessary in high-density installations.
Without this containment, the system suffers from reduced throughput and dropped connections.
Test Configuration
Engineers perform continuous-wave and modulated-carrier tests to verify the transmitter characteristics under extreme thermal conditions. Measuring the conducted power mask requires precise attenuation to protect the input stage of the spectrum analyser from damage. Automated software sweeps the frequency range and compares the recorded power levels against the predefined limit curves.
This procedure is repeated across all supported channel bandwidths and modulation schemes to ensure complete coverage.