Rate and distinction
A. FM wireless microphone: commonly known as FM refers to FM 88-108MHz international FM radio frequency band. The early consumer wireless microphone is received by FM radio. The system is simple and cheap, but it can not meet the requirements of professional quality because of the effect of use. In twenty-first Century, it can only be a toy for children or students.
B. VHF wireless microphone: also divided into two types of low frequency and high frequency section, the former uses the VHF50MHz frequency band, because the frequency is low, the use of antenna length is too long, and the most easy to be disturbed by all kinds of electrical clutter. Therefore, this type of product has been replaced by the high frequency section in twenty-first Century and gradually disappear from the market. The latter uses the VHF200MHz frequency band, because the frequency is high, the antenna is short, even can be designed into the hidden antenna. It is convenient, safe and beautiful. The interference of the electric clutter is greatly reduced. The circuit design is very mature and the price of the parts is low, so it has become the hot machine in the current market.
C.UHF wireless microphone: wireless microphone with 300-3000M frequency. It is the mainstream of the 21 century microphone application. The stability of the V segment is greatly improved because it avoids interference from the walkie talkie.
Distinguish
A. receiving wireless system (diversity receiving wireless system): due to the physical phenomenon of "dead angle" (Dead-point) in the electric wave, the sound of the receiver can be produced to produce the sound of the receiver and produce the shortcoming of intermittent or unstable. The AutomatIC switching diversity receiving is used to improve the dual tuner.
B. non automatic radio receiver wireless microphone system (Non-diversity receiving wireless system): because the circuit design of the above model is complex and precise, the assembly is difficult and the cost is high, the general low price model does not adopt the design of automatic selection, so it can not eliminate the shortcoming of the sound interruption in the use of the wireless microphone. Of course, this type of aircraft can not meet the basic requirements of professional occasions.
Way differentiation
A. quartz locking (Qualtz LOCked) machine: it is a standard circuit design for wireless microphone in today's wireless microphone with a quartz oscillator that produces accurate and stable fixed frequency of transmission and reception. This type of microphone and receiver only use a single frequency pairing, and can not change or adjust the frequency of use.
B. phase locked frequency synthesis (PLL Synthesized): in order to avoid the interference of other signals in the use of the wireless microphone in use, or to use multiple phones at the same time, it is necessary to change the channel at any time at any time, so the PLL circuit is used to achieve this function.
A. single channel system based on receiver: a non automatic signal or automatic receiver in the case of a receiver's chassis, the former has almost no market in Taiwan, but the market is the cheapest in the export market, but it is a (large color). The latter is simple and stable, and is suitable for multi-channel use in professional occasions and avoids signal interference.
B. dual channel: in the case of a receiver, a non automatic or automatic receiver of two channels is assembled to make full use of the space of the chassis to reduce the cost. The former is the so-called "Asian fighter" model, because the design is simple, and become the main type of low price manufacturers in Taiwan. The latter because of the complex mechanism and circuit, the internal interference processing and the antenna mix matching is not easy, only a small number of manufacturers in the production of professional machine models.
C. multi channel type: in a receiver's chassis, more than 4 channels are installed, most of which are designed by modular receiver module. It is mainly suitable for the use occasion of mounted professional aircraft.
