Because of the nature of radio communication, there is always at least a small chance of interference when using wireless microphones. While some kinds of interference are more or less beyond the control of wireless users, many types of interference are avoidable. Taking the simple precautions listed below will greatly reduce the chances that interference will become a problem.
- Make certain that the wireless frequencies are not on a local TV channel.
- Check all wireless frequencies in use to make certain that no two systems are on the same frequency.
- Check to make certain that no two wireless frequencies are too close together. In general, 1 MHz is the recommended minimum spacing between systems.
- If a considerable number of systems will be used, operating conditions will be difficult or interference is likely, consider using more sophisticated equipment. Higher-performance systems are better able to reject interference.
- Before using a system in a new location or another city, double-check for new problems. Small changes in conditions can cause interference where none was present before.
- Check the squelch control setting on the receiver. A higher squelch setting provides better protection against interference. However, since a high setting also can cause a reduction in operating range, set the control to the lowest position that reliably mutes the interference.
- Make certain that all batteries are fresh and new. Weak batteries make a system more susceptible to interference.
- Turn off unnecessary electronic equipment, especially computers, CD players, and other digital devices. These are a relatively common cause of wireless interference, especially if they are near the receiver.
- If use of computers or digital devices is necessary, keep them at least 3 feet (1 meter) away from the wireless receiver and its antennas.
- If interference does occur, see Resolving Interference Problems for suggestions on solving the problem. Additional information about Types of Interference is also available.
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