1. Transmitter transmission signal
The V segment wireless microphone transmitter mainly adopts several stages of frequency multiplying circuits to obtain high-frequency signals, and the signal carrier frequency of the transmitter is fixed.
U segment wireless microphone transmitters mostly use phase-locked loop technology to obtain high-frequency signals, and the frequency of the transmitter is mostly adjustable.
2. Receive the transmission signal of the host
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 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 transmission and the 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; by VHF TV channel, paging The letter machine and industrial pollution such as electric welding, motor and so on 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, and 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.
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