Wireless phone from sound to signal, and then modulated into high-frequency radio waves emitted, and then received back to demodulation, amplification, restore to the whole process of sound, there are many links, a link did not notice, there may be many links, a link did not notice, wireless microphone working range will be reduced, the use of the range will be reduced, the use of the range will become smaller, It will not even be interfered with, because the working range of the wireless microphone will be reduced, and the use of the wireless microphone will not be affected. On the contrary, every link should pay attention to, the anti-interference ability of the wireless microphone will be greatly enhanced, and the stability will be greatly improved.
First, the use of the operator should pay attention to matters
1. Precautions before use
The performer should carefully check the wireless microphone before playing or using it, correctly connect the system, reasonably set up the antenna, and ensure that the microphone is in normal working condition. Avoid silent sound of wireless microphone during performance or use
(1) Check whether the battery box is in good contact and whether the battery is powered on.
(2) When starting, the receiver should first be turned on, the RF meter head should be checked, the channel is free of RF interference RF interference, and then the emitter is developed.
(3) Check the microphone sound switch to ensure that the wireless transmitter and microphone are always working.
(4) Do not stack the receivers together so as not to interfere with each other.
(5) After use, please take out the power supply, because each microphone is a tap switch, whether it is in standby state, the battery will be charged.
2. Precautions in use
(1) When performing, pay attention to observe whether the RF signal indicator is normal to prevent interference from external wireless signals.
(2) When transferring the microphone, avoid stacking multiple wireless microphones that are being opened together, and do not approach the receiving antenna, so as to avoid intermodulation interference, affecting the use of wireless microphones.
(3) If there is noise in the sound, it may be that the microphone head is not installed in place, or the sensitivity of the microphone head is set too high, or the frequency used is interfered with.
① There are interference sources (such as mobile phones, walkie-talkies, cordless phones and other electromagnetic interference), in this case, first change the frequency of the receiver, find out the frequency of the receiver's RF signal without interference, and carry out the frequency; Especially when using multiple sets of wireless microphones, pay special attention to opening the frequency segment.
② Poor site reception conditions (such as the site is blocked by a column, or the site is reflected by metal equipment, glass, and the sound control room is blocked or turned by a wall far away from the venue) will affect the normal reception of signals. There are usually several ways to solve this problem.
As far as possible, use a diversity wireless system (that is, one microphone, two antennas), because two antennas receive a larger range.
② The direction and Angle of the antenna can be changed to improve the receiving effect.
If the receiving environment is too poor, such as the audio control room is not on site, just extend the antenna to solve the problem
④ When the wireless microphone needs to be replaced, the power supply of the microphone should be turned off first, then replaced, and then turned on the microphone switch.
⑤ Note that there is a power supply choice in the wireless microphone handle, L for low-power transmission, H for high-power transmission (can transmit and receive a long distance and large power consumption), set for the use of the environment.
Second, the use of personnel should pay attention to matters
(1) Do not hold the head of the microphone with your hand.
Since all the receiver parts of the microphone have a certain directivity, if you grasp the net cover part with your hand, it will change the directivity and frequency response of the microphone, and it will also produce effects such as feedback and whistling due to the aggregation effect of the palm.
(2) Do not hold the antenna transmitting position
The transmitter circuit and antenna are located at the lower part of the microphone (away from the microphone head). When the hand comes into contact with the antenna, most of the RF energy is lost because it cannot enter the air, reducing the use range of the wireless system and affecting the receiving effect. Usually, the handheld microphone is used.
(3) The distance between the mouth should be properly maintained
When holding a wireless microphone, the distance between the microphone and the mouth is generally maintained between 5 and 250 px, too close will produce a close talking effect, too far the sound will make the distance between the microphone and the mouth is too close, so that the distance between the microphone and the mouth is as close as possible; When using a wireless microphone, keep it close to your mouth; When using the head microphone, avoid mouth to the head of the microphone, avoid the impact of the sound flow, should move to both sides.
(4) Avoid pointing the microphone directly at the speaker
If the microphone is pointed directly at the speaker, as far as the entire system is concerned, a closed loop is formed, resulting in a positive feedback (whistling) phenomenon that must be avoided.
(5) Try to avoid placing two wireless microphone transmitters close together to avoid intermodulation interference.