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June 22, 2006
Dennis Wharton
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NAB Study Shows Wireless FM Modulators Exceed FCC Limits

NAB recently performed a series of tests on 17 wireless FM modulator devices that are currently on the market today. These devices are used by many consumers to transmit audio signals from their satellite radio or MP3 player to their in-dash car radio. Our tests showed that 13 of the 17 wireless devices (76%) exceeded field strength limits set by the FCC. Six of those devices exceeded the FCC field limit by 2,000%. One device transmitted a signal that was 20,000% stronger than allowed by FCC rules. Many of the devices also transmitted signals that were substantially wider in bandwidth than permitted by the FCC, resulting in potential interference to 1st and 2nd adjacent channels as well.

NAB has sent letters to both FCC Chairman Martin as well as Senate Commerce Committee Chairman Ted Stevens and Co-Chairman Daniel Inouye notifying them of these results. This timely study raises many questions about the operation of wireless transmitter devices in broadcast spectrum and should be taken into account when considering any "white space" legislation that would permit unlicensed device operation in TV spectrum.

A full copy of the report can be viewed and downloaded by clicking here.

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