TV STATIONS
PROBLEM: Wireless microphones are also subject to interference from other sources transmitting in the same spectrum. The most significant culprits are typically TV stations. FCC rules require wireless microphone users to avoid frequencies in TV channels occupied by a broadcast TV station in the same geographic area.
SOLUTION: When indoors, avoid TV channels active within 40 to 50 miles. Outdoors, a 50- to 60-mile radius should be used. Because active channels vary from city to city, the appropriate frequencies for wireless microphone operation depend on location. Manufacturers usually offer guidance as to which frequencies to use in different cities.
According to FCC mandates, all analog TV stations will cease operations in February 2009. At the same time, the spectrum above TV channel 51 will be repurposed for use by new services. Wireless microphones operating above 698 MHz may need to be tuned to a lower frequency in order to avoid experiencing interference once new services become active. As the transition continues, the occupied TV channels in a given location may change, so it's wise to regularly check published information.
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