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I checked the Whole House website and the only thing I found about FCC certification was:
Is this FM Transmitter Designed to be FCC Compliant and What Exactly are the FCC Rules?
Yes, the Whole House FM Transmitter is designed to be FCC compliant with Part 15C [Section 15.239(b)] which states:
The field strength of any emissions within the permitted 200 KHz (88 – 108MHz) band shall not exceed 250 microvolts/meter at 3 meters. The emission limit in this paragraph is based on measurement instrumentation employing an average detector.
Since this is a question the FCC receives a lot they have also issued a FCC Part 15 Public Notice dated July, 24 1991 that helps clarify the maximum distance you can transmit without needing a FCC license. They provide an “Approximate Maximum Coverage Radius” of 200 feet. Read the FCC Part 15 Public Notice dated July, 24 1991.
“Designed to be FCC compliant” doesn’t mean it is certified. It doesn’t appear to be certified but I could have missed something.