Wireless microphone, is by a number of pocket transmitter (can be installed in a coat pocket, the output power of about 0.01W) and a centralized receiver, each of the pocket transmitter each has a different operating frequency, the centralized receiver can be received by the same time, the various pocket transmitter sends out different operating frequency voice signals. The centralized receiver can simultaneously receive the voice signals of different operating frequencies from the various pocket transmitters. It is adapted to the stage podium and other occasions.
a. FM wireless microphone: commonly known as FM refers to the FM 88-108MHz international FM radio band. Early consumer wireless microphone is the use of FM radio to receive, the system is simple, low-cost, but because of the use of the effect, can not meet the requirements of professional quality, the 21st century can only become a child or student toys.
b. VHF wireless microphone: divided into two types of low-frequency and high-frequency band, the former use VHF50MHz band, due to the lower frequency, the use of antenna length is too long, and the most vulnerable to a variety of electrical interference, so this type of product, in the 21st century, has been replaced by the high-frequency band and gradually disappeared from the market. The latter use VHF200MHz band, due to the higher frequency, the use of antennas shorter, and even can be designed as a hidden antenna, convenient, safe and beautiful, by the interference of electrical appliances and greatly reduce the interference of clutter, the circuit design is extremely mature, the popularity of the parts of the price is low, so it has become a popular type of machine on the market today.