Do you know the difference between the U segment and the V segment wireless microphone?
The difference between the U segment and the V segment wireless microphone mainly reflects the following four aspects: 1. The transmission signal of the transmitter
The VHF (V-segment) wireless microphone transmitter section mainly uses several stages of frequency multiplier circuits to obtain high-frequency signals, and the signal carrier frequency of the transmitter is fixed.
UHF wireless microphone transmitters mostly use phase-locked loop technology to obtain high-frequency signals, and the frequency of the transmitter is mostly adjustable.
2, receiving the host's transmission signal VHF wireless microphone receiver is also made a fixed frequency point.
UHF wireless microphone receivers are mostly made with adjustable receiving frequency.
3, anti-interference ability, therefore, when there is interference signal, VHF wireless microphone is difficult to avoid, UHF wireless microphone can easily avoid various interference by adjusting the frequency of the transmitter and receiver. UHF wireless microphones for professional performances tend to be true-diversity, that is, one microphone is received with two antennas, and UHF wireless microphones have a very low probability of occurrence of breakpoints (designed UHF true diversity wireless microphones).
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.
Precautions (1) Do not hold the net of the microphone with your hand.
The receiving part of all microphones has a certain directivity. If you hold the mesh cover part by hand, it will change the directivity and frequency response of the microphone. Due to the aggregation effect of the palm, it will affect the return and howling.
(2) Do not hold the antenna transmitting part of the microphone.
Generally, the handheld microphone has a transmitting circuit and an antenna located at the lower part of the microphone (away from the end of the microphone). When the human hand touches the antenna, most of the RF energy is lost due to the inability to enter the air, reducing the range of use of the wireless system, affecting Receive effect.
(3) Properly maintain the distance between the microphone and the mouth. When using the handheld wireless microphone, the distance between the microphone and the mouth is generally kept at 5-10 cm. If the distance is too close, the near-talk effect will be produced. If the sound is too far, the sound quality will be destroyed. When using a lavalier microphone, prevent the microphone from being too far away from the mouth and as close as possible to the mouth; use a headband microphone to avoid the mouth facing the microphone head and avoid the impact of the audible airflow, which should be moved to both sides.
(4) Avoid pointing the microphone directly at the speaker.
If you point the microphone directly at the speaker, the system forms a closed loop that produces positive feedback (howling), which must be avoided.
(5) Avoid placing two wireless microphone transmitters together to avoid intermodulation interference.
(6) During the use of the microphone, do not force the microphone to absorb the microphone to avoid damage to the microphone.
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