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The V segment does interfere with each other when using multiple sets of wireless microphones. Of course, it cannot be said that the U segment does not exist, but its expansion range is large and can be adjusted as much as possible. So what is the difference between the two? Which is more advantageous? Xiaobian will come to sort out and let you completely figure out.
The difference between the U segment and the V segment wireless microphone 1. The transmission signal of the transmitter The V segment wireless microphone transmitter portion mainly adopts several stages of frequency multiplying circuits to obtain a high frequency signal, and the signal carrier frequency of the transmitter is fixed.
U-band wireless microphone transmitters mostly use phase-locked loop technology to obtain high-frequency signals, and the frequency of the transmitter is mostly adjustable.
2. Receiver's transmission signal The V-segment wireless microphone receiver is also made to a fixed frequency point.
Most of the U-segment wireless microphone receivers are adjustable in receiving frequency.
3, anti-interference ability When there is interference signal, V-segment wireless microphone is difficult to avoid, U-band wireless microphone can easily avoid various interference by adjusting the frequency of the transmitter and receiver. The U-segment wireless microphones used for professional performances are often made into true diversity, that is, one microphone is received by two antennas, and the probability of occurrence of breakpoints in the U-segment wireless microphone is extremely small (designed UHF true diversity wireless microphone) ).
4. Signal transmission path VHF RF signal transmission has small reflection on small metal objects and can be diffracted; it can penetrate to non-metallic objects such as human body; the loss of feeder is low, the antenna can be extended appropriately; the battery is used for a long time; VHF TV channels, paging, letter machines and industrial pollution such as electric welding, electric motors, etc. have large interference; the usable frequency range is 61MHZ, the expandable range is too narrow, the frequency is crowded when using multiple microphones, the compatible frequency is small; the dynamic range of the signal is small .
UHF RF signal transmission has many reflections on small metal objects, and multi-channel propagation can form interference; occlusion attenuation is large for non-metallic objects such as human body; feeder loss is large, receiver should be as close as possible to microphone; large transmission power is required, battery The use time is short; the high frequency interference is less; the usable frequency range is 270 MHz, the expandable range is large, and it can be used by multiple microphones to form a larger system; the dynamic range of the signal is large.
Comparing so much, we can see that each of the two wireless microphones has its own characteristics. Why do most people say that the U segment is better than the V segment?
1. The amount of information is well known by the frequency of electromagnetic waves, and the amount of information is determined by the frequency of electromagnetic waves. The lower the frequency, the longer the transmission distance and the smaller the loaded data. The higher the frequency, the shorter the transmission distance and the larger the amount of data loaded. The V wave and the U wave are in two directions, which is why the V wave is more suitable for radios, walkie-talkies, aerospace communications, and U waves are suitable for television sets.
Because the V-band is narrow (180MHZ--280MHZ), it will interfere with each other in more than 6 bands, and the U-band range will be wider (500MHZ--900MH), so there will be more than 60 interferences. In addition to the small loading data, this is one of the important reasons why the V-band sound is not good.
Now with the development of technology, the processing of sound is more and more professional, requiring the selection of the V-band at a long distance, and the U-band with the requirement of sound quality. These two frequency segments for wireless microphones have their own advantages and disadvantages. This is determined by the user of the frequency band, the physical characteristics of the frequency band, and the adjustment limits of the frequency band.
Because the U segment is a high-frequency transmission and reception, the requirements for the electronic component are higher than those of the V segment, and the technical content is also relatively high. In terms of application, the U segment is not a segment with most of the frequencies in daily life, so the chance of interference is greatly reduced. The U segment has a wide segment, and more frequency points can be divided to achieve multiple frequencies in the same occasion without interference.
2, the manufacturer's cost has a real problem is that the microphone manufacturer for the above reasons for the purchase of materials on the U segment of the product will be more cost than the V segment. In actual use, since most of the U segments have a frequency modulation function, it is more convenient than the V segment.
In the performance or entertainment sound reinforcement project, when using a wireless microphone, is UHF (U segment) or VHF (V segment)? In general, the V-segment microphone is suitable for hotels, convention centers, and teaching systems; and the U-segment microphone is suitable for broadcast television and theater performances. Systems with multiple sets of channels working simultaneously use true diversity reception. However, experienced design and construction personnel usually try to test both systems before the show, mainly to check whether the electromagnetic space on the site is suitable for your wireless microphone.
July 03, 2023