Changing a certified radio: prepare hardware, software and permissive-change evidence
The acquired § 2.1043 distinguishes changes to basic circuitry/power ratings from classes of permissive change, with software-specific context. Describe the actual before/after change and affected emissions; this guide does not classify your change or authorize marketing under an existing grant.
Evidence retrieved 2026-10-06. Source versions and topic-specific limits are listed below.
Sourced criteria · US
What changes the service scope?
Decision or task
What the source describes
What to prepare
title 47 / section § 2.1043 / XML P[1]
(a) Except as provided in paragraph (b)(3) of this section, changes to the basic frequency determining and stabilizing circuitry (including clock or data rates), frequency multiplication stages, basic modulator circuit or maximum power or field strength ratings shall not be performed without application for and authorization of a new grant of certification. Variations in electrical or mechanical construction, other than these indicated items, are permitted provided the variations either do not affect the characteristics required to be reported to the Commission or the variations are made in compliance with the other provisions of this section. Changes to the software installed in a transmitter that do not affect the radio frequency emissions do not require any additional filings and may be made by parties other than the holder of the grant of certification. [1]
Compare this exact dated paragraph, its stated conditions and the linked provisions with the supplied configuration evidence.
title 47 / section § 2.1043 / XML P[2]
(b) Except for equipment prohibited from authorization pursuant to § 2.903, three classes of permissive change may be made in certificated equipment without requiring a new application for and grant of certification. Any of these classes of changes must not result in a change in identification. [2]
Compare this exact dated paragraph, its stated conditions and the linked provisions with the supplied configuration evidence.
title 47 / section § 2.1043 / XML P[3]
(1) A Class I permissive change includes those modifications in the equipment which do not degrade the characteristics reported by the manufacturer and accepted by the Commission when certification is granted. No filing is required for a Class I permissive change. [3]
Compare this exact dated paragraph, its stated conditions and the linked provisions with the supplied configuration evidence.
title 47 / section § 2.1043 / XML P[4]
(2) A Class II permissive change includes those modifications which degrade the performance characteristics as reported to the Commission at the time of the initial certification. Such degraded performance must still meet the minimum requirements of the applicable rules. [4]
Compare this exact dated paragraph, its stated conditions and the linked provisions with the supplied configuration evidence.
This is a focused preparation guide, not the complete rule set or a product-specific legal determination. Current related rules, amendments/effective dates, grant conditions and deciding buyer facts remain unresolved. No scope, exemption, certification, emission limit or test-panel result is automatically assigned.
Prepare the RF configuration evidence
Use this checklist to gather your business or product details before speaking with a specialist. The items below explain what to record and suggest useful supporting documents. You can add your own answers in the editable project brief.
Describe the exact change
Identify circuitry, frequency/data-rate, modulation, power, construction and software changes with versioned evidence.
Useful evidence: Before/after schematics, specifications, firmware versions and change rationale.
Assess affected characteristics
Ask the responsible specialist/grantee which reported characteristics may change and what evidence establishes the effects.
Useful evidence: Original grant/reports and a change-impact/evidence matrix.
Confirm the authorized route
Obtain the reviewed route, filing/acknowledgement needs and marketing conditions under the complete current provisions before release.
Useful evidence: Written change classification, supporting tests and release controls.
Work packages and dependencies
Conditional: Changing a certified radio: prepare hardware, software and permissive-change evidence — Review the documented configurations and current complete provisions; agree the justified evidence/testing scope and its exclusions.
Questions for providers
Which exact configuration facts and current provisions justify the proposed scope for Changing a certified radio: prepare hardware, software and permissive-change evidence?
Which supplied-source and grant conditions remain unresolved, and how will you investigate them?
Which operating modes/configurations, evidence deliverables and exclusions are included in the quotation?
Sources and data dates
Read the official document in context. The audit details identify the precise locators and preserved versions used for this page.
