Evaluating Permissive Change Compliance Paths for Potted RF Transmitter Modules
Adding potting compound to an unpotted RF module demands Class II permissive change re-testing if dielectric loading increases radiated spurious emissions.
Host Integration Guide
Meaning
Technical manuals are provided by modular transmitter manufacturers to instruct host system integrators on how to install the module without violating regulatory compliance. The host integration guide outlines the mandatory board layouts, antenna trace designs, and shielding requirements that must be followed. This document ceases to apply if the host integrator elects to use a different antenna type than those pre-approved under the module’s grant.
Instructional Layout
Circuit board designers must follow the specified trace dimensions to maintain the module’s certified RF performance. The host integration guide provides step-by-step instructions on trace routing, copper clearances, and decoupling capacitor placement. Failing to adhere to these design rules can lead to increased radiated emissions and can invalidate the existing modular approval.
This requirement ensures that the host product inherits the module’s regulatory status without a complete recertification.
Antenna Specification
Permissible antenna gains and trace routing topologies are specified to prevent exceeding the allowed radiated power limits. Deviating from these specifications forces the integrator to seek a separate permissive change.
Compliance Handover
Responsibility for final product compliance is divided between the module vendor and the host developer. The integrator must verify that the finished system complies with out-of-band emission standards.