a. Qualtz LOCked model: It uses a quartz oscillator to generate a precise and stable fixed frequency for transmitting and receiving. The circuit is simple and the cost is low. It is the standard circuit design of today’s wireless microphones. This type of microphone and receiver can only be paired with a single frequency, and the frequency cannot be changed or adjusted.

b. PLL Synthesized model: In order to avoid the wireless microphone encountering interference from other signals during use, it cannot be used, or to use multiple microphones at the same time, it is necessary to change the channel conveniently and quickly at any time, so The circuit design of PLL is adopted to meet the requirements of this function.

According to the receiver a. Single-channel model: Only one channel of non-auto-selection or automatic-selection receiver is installed in the chassis of a receiver. The former has almost no market in Taiwan, but the export market has the cheapest price. One item (big color goods). The latter is the best model for multi-channel simultaneous use in professional situations due to its simple use and stable characteristics to avoid signal interference.

b. Dual-channel model: In the case of a receiver, a two-channel non-automatic or automatic selection receiver is equipped to make full use of the space of the case and reduce costs. The former is the so-called “Asian fighter jet” model, because of its simple design, it has become the main model of Taiwan’s mass-produced low-priced manufacturers. The latter is not easy to deal with internal interference and antenna mixing and matching because of its complicated mechanism and circuit. It is only available for a few manufacturers that produce professional models.

c. Multi-channel models: In the case of a receiver, receivers with more than four channels are assembled, and most of them adopt the mechanical design of modular receiving modules. It is mainly suitable for the use occasions of rack-mounted professional models.