FCC Class II Permissive Change Mechanics for Antenna Modifications in Modular Host Integrations
Modifying modular antennas triggers FCC Class II Permissive Changes whenever gain, radiator type, or host SAR conditions alter baseline RF compliance.
TCB Clearance
Meaning
Formal administrative authorization issued by an accredited Telecommunication Certification Body confirms that an intentional radiator complies with applicable FCC rules. Obtaining TCB clearance validates that test reports, antenna specifications, test setup photographs, and operational descriptions conform to Federal Communications Commission Title 47 requirements. The grant applies exclusively to the tested hardware layout and becomes void if unauthorized radio frequency alterations or unapproved antenna gains are introduced.
Review Procedure
Accredited certification bodies inspect test reports generated by third party radio frequency testing laboratories. The TCB clearance process requires auditors to cross check conducted power measurements, spurious emission sweeps, and occupied bandwidth plots against regulatory rules. Any discrepancy in test setup photos or schematic diagrams halts evaluation until the applicant uploads corrected technical exhibits.
Grant Issuance
Following a compliant technical audit, the certification body uploads the approval package directly to the FCC Equipment Authorization System database. The resulting TCB clearance issues an official Grant of Equipment Authorization bearing the assigned FCC Identifier code. Commercial shipment of transmitting hardware across United States borders remains illegal until this grant appears in the public registry.
Modular Integration
Original equipment manufacturers integrating pre-certified wireless modules leverage existing filings through permissive change procedures. A full TCB clearance may be avoided if the integrator incorporates the certified module strictly according to manufacturer antenna guidelines and maintains required co-location clearances. Modifying trace layouts or swapping an antenna for a higher gain model triggers a Class II Permissive Change requiring new test exhibits.