Meaning
Administrative process used to modify the certification of a radio device without submitting it for an entirely new grant of equipment authorization. This permissive change engineering involves documenting hardware or software updates to a previously approved module. It categorizes modifications into different classes based on whether they affect the radio frequency characteristics or the enclosure.
Class Distinction
Minor changes that do not alter the radiated power or frequency stability fall under class one. When a manufacturer replaces a pin to pin compatible component, permissive change engineering verifies that the emissions remain within the original test limits. This avoids the cost and delay of full lab retesting.
Class two changes are more substantial and require a formal filing with the regulatory body.
Technical Evaluation
Engineers perform comparative tests to show that the new version performs as well as the original. In permissive change engineering, the focus is on the worst case emission levels observed during the initial certification. The data must show that the update did not degrade the compliance margin.
This process allows for continuous product improvement while maintaining a valid market entry.
System Impact
Adding a new antenna type to a module often triggers this workflow. Permissive change engineering ensures that the peak gain and radiation pattern stay within the allowed limits for the specific radio technology.
