Executing Class Two Permissive Changes for Substituted Host Antennas
Substituted host antennas qualify for Class II Permissive Changes only when peak gain stays below certified limits and radiative physical structure remains identical.
Attestation Letter
Meaning
Declarative documents provided by a manufacturer or testing laboratory confirm that a specific hardware configuration or software version meets defined criteria without requiring a new series of physical tests. An attestation letter allows a grantee to bypass redundant lab work by asserting that current equipment remains electrically identical to previously certified models. Administrative tools like these link existing test reports to new product variants or rebranding efforts.
Documentary Evidence
Verification happens when the signatory identifies the specific delta between the original product and the new variant. If the only change is the model name, a letter is sufficient.
Regulatory Submission
Authorities like the Federal Communications Commission accept these declarations to simplify the equipment authorization process. The letter must explicitly reference the original grant of equipment authorization and the new identifier. It lists the technical justifications for why the original test data remains valid for the modified device.
Providing a clear map of the hardware heritage allows the regulator to process the application without further inquiry.
Modification Declaration
Engineers use this method to handle component substitutions when the original parts reach end of life. Replacing a resistor or a capacitor with an equivalent part does not always trigger a full hardware audit. The declaration confirms that the change has no impact on the radio frequency characteristics.