Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?
Gain is less than 23 dB when driven by power of 10 watts or less
The equipment dealer assembled it from a kit
It was manufactured and certificated in a country which has a reciprocal certification agreement with the FCC
The amplifier is constructed or modified by an amateur radio operator for use at an amateur station✓Correct answer
Explanation
Certification is not required for an amplifier constructed or modified by an amateur radio operator for use at an amateur station, and that is the exemption among these choices that the rule actually contains. A kit assembled by the dealer and a foreign certification agreement are not exemptions, and the 23 dB gain figure is not in the rules, which cap certified amplifier gain at 15 dB.