Navigating Modular FCC Approvals for Embedded Wireless Hardware Devices
Pre-certified FCC modular grants eliminate fundamental radio testing but require strict host trace adherence, exposure compliance, and Part 15B verification.
KDB Publication 447498
Meaning
Regulatory guideline issued by the Federal Communications Commission that defines exposure compliance requirements for radio frequency devices. KDB Publication 447498 specifies the formulas and test configurations used to determine if a wireless product requires specific absorption rate testing or qualifies for an exemption. This document governs all transmitters operating in the United States.
Exemption Calculation
Device manufacturers calculate power thresholds based on the separation distance to the human body. When the calculated output power is below the threshold for a given frequency and distance, the device is exempt from laboratory exposure testing. If the device exceeds this limit, physical testing in a simulated tissue phantom becomes mandatory.
Simultaneous Transmission
Multiple transmitters operating together require a specialized evaluation of their combined exposure. The guideline details how to calculate the sum of the exposure ratios for co-located radios such as Wi-Fi and Bluetooth. When this sum exceeds the legal limit, the integration design must be modified.
This modification often involves reducing the output power of the modules or increasing antenna separation.
Certification Submission
Telecommunication certification bodies review the calculated exposure data before granting equipment authorization. The applicant must include the math showing compliance with KDB Publication 447498 in the official filing. This prevents delays during the review process.