Before purchasing products,
First of all, there should be a product category
Only with basic concepts can you choose a model that suits your needs. The types of wireless microphones can be divided into many different types according to different definitions.
Differentiate by rate
a. FM wireless microphone: commonly known as FM refers to the FM 88-108MHz international FM radio frequency band. Early consumer wireless microphones used FM radios to receive. The system was simple and low in cost. However, due to the effect of use, it could not meet the quality requirements. In the 21st century, it can only become a toy for children or students.
b. VHF wireless microphone: It is divided into two types, low frequency and high frequency. The former uses the VHF50MHz frequency band. Because of the low frequency, the antenna length is too long, and it is easy to be interfered by various electrical clutter, so this type of product , Has been replaced by high frequency bands in the 21st century and gradually disappeared from the market. The latter uses the VHF200MHz frequency band. Because of the higher frequency, the antenna is shorter, and it can even be designed as a hidden antenna, which is convenient, safe and beautiful. The clutter interference of the receiver is greatly reduced, the circuit design is extremely mature, and the parts are popular at a price. Low cost, so it has become a popular model on the market today.
c. UHF wireless microphone: use a wireless microphone with a frequency of 300-3000M. It is the mainstream of microphone applications in the 21st century. Because the interference of V-segment walkie-talkies is avoided, the stability is greatly improved.
a. True diversity receiving wireless microphone system (True diversity receiving wireless system): Due to the physical phenomenon of "dead-point" (dead-point) in the radio waves, the sound output of the receiver will produce intermittent or unstable shortcomings. To solve this defect, the model adopts the "AutomatIC switching diversity receiving" (AutomatIC switching diversity receiving) method with dual antennas and dual tuners to improve.
b. Non-diversity receiving wireless microphone system (Non-diversity receiving wireless system): Due to the complicated and detailed circuit design of the above models, it is difficult to assemble, and the cost is high. Generally, low-cost models do not adopt the design of automatic selection. , So it is impossible to eliminate the shortcomings of sound interruption caused by wireless microphones in use. Of course, this type of machine cannot meet the basic requirements of the occasion.
Way to distinguish
a. Qualtz LOCked model: It uses a quartz oscillator to generate a fixed frequency with accurate and stable transmission and reception. 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 prevent the wireless microphone from encountering interference from other signals and cannot be used during use, 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 a receiver chassis. The former has almost no market in Taiwan, but the export market is cheap because of its low price. Item (big color goods). The latter is a model suitable for simultaneous use of multiple channels and avoid signal interference due to its simple use and stable characteristics.
Multi-channel wireless microphone
b. Dual-channel model: In the case of a receiver, two-channel non-automatic selection or automatic selection receivers are equipped to make full use of the space of the case and reduce costs. The former is the so-called "Asian fighter" model, because of its simple design, it has become the main model for 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 models.
c. Multi-channel model: 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. Mainly suitable for the use occasions of rack-mounted models.