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Detailed explanation of the difference between wireless microphones, the original difference is so big

2021-02-27 36
The convenience of wireless microphones is obvious to all. In addition to stage performances, they are also widely used in KTV, conference rooms and other occasions. However, some people think that wireless microphones are susceptible to interference and have poor stability. They may have become a stereotype among some people after a bad experience, and it is difficult to change. For some ordinary users, they didn't want to learn too much.

In fact, the main cause of this situation is the frequency band.
The current wireless microphones are divided into two frequency modulation modes. [U-segment and V-segment] In the two, the stability and anti-interference performance are "the smallest difference, but the difference is a thousand miles."

How big is the difference between U-segment and V-segment?
U section: Features use phase-locked loop technology to obtain high-frequency signals, and the frequency of the transmitter is mostly adjustable.

Section V: The high frequency signal is obtained by using several frequency multiplication circuits, and the signal carrier frequency of the transmitter is fixed and non-adjustable.

A detailed explanation of the difference between wireless microphones, it turns out that the difference is so big that I was fooled by accident.
It can be understood this way, multi-lane and single-lane. The former can be changed at any time, and the frequency of multiple machines can be switched at will to avoid encountering them, while the latter has only one fixed frequency. If one more machine is used, it will interfere with each other. It is equivalent to being blocked on a single lane.

Anti-interference ability

When there is an interference signal, the V-segment wireless microphone is difficult to avoid, and the U-segment wireless microphone can easily avoid various interferences by adjusting the frequency of the transmitter and the receiver. U-segment wireless microphones used for professional performances are often made of true diversity, that is, a microphone uses two antennas to receive, the probability of breakpoints in the use of U-segment wireless microphones is extremely small, represented by the Kay Frog U7200 One category (excellent designed UHF true diversity wireless microphone).


Detailed explanation of the difference between wireless microphones, the original difference is so big


A detailed explanation of the difference between wireless microphones, it turns out that the difference is so big that I was fooled by accident.
Kay Frog U7200 true U section one with two wireless microphones

Signal transmission path
VHF radio frequency signal transmission has little reflection on small metal objects and can be diffracted; it can penetrate non-metal objects such as the human body; the loss of the feeder is low, and the antenna can be appropriately extended; the battery can be used for a long time; it is affected by VHF TV channels and paging , Letter machine and industrial pollution such as electric welding, electric motor, etc. have large interference; the usable frequency range is 61MHZ, the expandable range is too narrow, the frequency is crowded when using the multi-microphone, and the compatible frequency is small; the dynamic range of the signal is small.

UHF radio frequency signal transmission reflects much to small metal objects, and multi-path propagation can cause interference; it shields and attenuates non-metal objects such as the human body; the loss of the feeder is large, and the receiver should be as close to the microphone as possible; larger transmission power is required, and battery The use time is short; the high frequency interference is less; the usable frequency range is 270MHZ, the expandable range is large, and the multi-microphone can be used to form a larger system; the dynamic range of the signal is large.

After so many comparisons, each has its own characteristics, so why do most people choose U-band microphones now?

This has to be said, because the U-segment microphone has many frequency points, it has strong anti-interference and is not easy to cross frequency. Most of the scenes used now: meeting rooms, classrooms, KTV, performances, etc. If you need multiple simultaneous use, you have to choose U-segment microphones, which is why U-segment wireless microphones are favored by most people.

Factory cost
This is a real problem. Because of the above reasons, the microphone manufacturer will cost more on the materials of the U-segment product than the V-segment. In actual use, since most of the U-segment has a frequency modulation function, the U-segment is also more convenient.

Therefore, before buying a wireless microphone, it is indeed necessary to ask whether it is a U-segment or a V-segment. Generally speaking, merchants selling U-segment microphones will use this as a selling point, mainly to promote. Most of the vendors who sell V-segment microphones will not explicitly emphasize this point. You must ask clearly when you buy.
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