VHF (Very High Frequency), very high frequency, refers to radio waves in the frequency band from 30 MHz to 300 MHz.
UHF (Ultra High Frequency), ultra-high frequency, refers to radio waves in the frequency band between 300-3000MHz.
These two radio bands are widely used in television, FM radio, mobile phones, pagers, stock information machines, microwave communications, and radar.
01 Transmitter transmission signal
Most U-segment wireless microphone transmitters use phase-locked loop technology to obtain high-frequency signals, and most of the transmitter frequencies are adjustable.
The V-segment wireless microphone transmitter part mainly uses several stages of frequency multiplication circuits to obtain high-frequency signals, and the signal carrier frequency of the transmitter is fixed.
02 Receive the transmission signal from the host
Most U-segment wireless microphone receivers are made with adjustable receiving frequencies. The V-segment wireless microphone receiver is also made into a fixed frequency point.
03 Anti-interference ability
When there is an interference signal, it is difficult to avoid the V-segment wireless microphone, and the U-segment wireless microphone can easily avoid various interferences by adjusting the frequency of the transmitter and receiver. U-segment wireless microphones used for professional performances are often made into true diversity, that is, one microphone uses two antennas to receive, and the probability of breakpoints in the use of U-segment wireless microphones is extremely small (especially the well-designed UHF true diversity). wireless microphone).
The V-band has a narrow low-frequency range (180MHZ--280MHZ), so there will be interference between more than 6 bands, and the U-band range is wider (500MHZ--900MH), so there will be more than 60 interference. In addition to the small load of data, this is one of the important reasons why the V-band sound is not good.
04 Signal Transmission Pathway
UHF radio frequency signal transmission has many reflections on small metal objects, and multi-path propagation can cause interference; the shielding and attenuation of non-metallic objects such as the human body are large; the loss of the feeder is large, and the receiver should be as close to the microphone as possible; large transmission power is required, and the battery The use time is short; the high-frequency interference is less; the usable frequency range is 270MHZ, the expandable range is large, and multiple microphones can be used to form a larger system; the dynamic range of the signal is large.
VHF radio frequency signal transmission has little reflection on small metal objects and can be diffracted; it can penetrate non-metallic 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; , letter machine and industrial pollution such as electric welding, motor, etc. have large interference; the usable frequency range is 61MHZ, the expandable range is too narrow, the frequency is crowded when multiple microphones are used, and the compatible frequency is small; the dynamic range of the signal is small.
U or V, each has its own merits, choose as needed To sum up, since the U-segment is a high-frequency transmitter and receiver, the requirements for electronic components are higher than those of the V-segment, and the technical content is correspondingly much higher. In terms of application, because the U segment is not the same segment as most of the frequency waves in daily life, the chance of being interfered is greatly reduced. The U segment has a wide segment, and more frequency points can be misclassified to achieve the use of multiple frequency points on the same occasion without interference.
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