Precautions and tips for using wireless microphones

With the popularity and widespread use of wireless microphones, how can they better play their superior role, the following issues should be paid attention to in operation and use:
1. How to buy battery for wireless microphone transmitter
In order to ensure that the signal distortion and frequency interference will not occur during the normal use of the system, a sufficient battery must be used. It is best to use an alkaline 9V battery if conditions are available when purchasing.

2. How can I know as soon as possible whether the transmitter battery energy is sufficient?
In various brands and models of wireless microphone systems, most receivers do not have the transmitter battery energy display function. Although some wireless transmitters have low battery display
However, users generally rarely pay attention to this problem in use. In the normal use of wireless microphones, audio signal distortion or frequency interference is sometimes caused by insufficient battery
What happened. In order to prevent this phenomenon, the operator can use the PFL pre-listening function of the mixer in a timely manner during the normal use of the wireless microphone, and monitor the wireless conversation with headphones.
If the signal of the tube is slightly reduced or the noise is slightly increased, the battery should be replaced immediately, so as to avoid as far as possible from the lack of battery energy to the operator
Coming psychological pressure.

3. How to change the battery in the middle of the show
It should be convenient, quick and simple to change the battery during the performance. The best way is to turn on the "mute" switch of the mixer channel to make the wireless microphone in a mute state.
A functional mixer can first turn off the output volume of the wireless microphone receiver, then turn off the transmitter power, replace the battery, turn on the transmitter power, and then output the receiver
The output volume is restored to the original gain. If the receiver does not have an output volume switch, you can turn off the mixer input gain or use the Line/MIC selector to switch, and it will be replaced.
Turn on the battery and reset the mixer input gain or selector. Why not change the battery after turning off the fader of the wireless microphone channel? One thing to explain here,
If you use the method of turning off the channel faders to replace the battery, it is more cumbersome. Generally speaking, the microphone is added with effect processing sound during the singing. If one microphone is used, the other wireless
The microphone needs to replace the battery. If you turn off the channel fader at this time, you should also turn off the auxiliary channel potentiometer for reverberation and delay. If you forget to turn off the auxiliary channel
Potentiometer, when the battery is replaced, the impact sound of the power supply of the wireless microphone transmitter will be output from the auxiliary channel to the mixer through the effector, which directly affects the sound effect; furthermore, if
If the auxiliary potentiometer is leaked after replacing the battery, there will be no effect sound, which will affect the sound effect. I would like to remind everyone to pay great attention to the fact that you must
Develop the habit of taking out the transmitter power (especially use non-alkaline batteries), otherwise you may forget to turn off the transmitter power because you have not taken out the battery.

An accident that causes the battery to run out, causes battery leakage to damage the transmitter system, and causes unnecessary losses.

Fourth, how can we prevent and avoid external interference to wireless microphones
Before purchasing a non-frequency conversion wireless microphone, you should find out the transmitting frequency of the local TV station. When purchasing, you should stagger the transmitting frequency of the TV station to avoid interference, and choose multiple wireless microphone systems.
It should also be noted that the frequency of each system cannot be repeated to avoid mutual interference when the frequency overlaps.

Five, how to eliminate the wireless microphone from the outside interference
When the non-frequency conversion diversity wireless microphone system is interfered by the outside (referring to when the transmitter is turned off, there are still RF radio frequency, AF audio or DIVERSITY points on the receiver display
If the LED display connected to either or both of A and B has a signal display, it indicates that the receiver is in external radio wave interference), which can be adjusted by SQUEICH
To improve reception and reduce interference. The specific method is to adjust the antenna position, the transmitter is still turned off, and the receiver volume output gain is turned off, and finally clockwise
Adjust the SQUEICH noise suppressor in the direction until all the interfering signals disappear (there is no signal display except the power display at this time), then turn it clockwise a little bit.
Be sure to use a non-inductive screwdriver.

6. How to use the antenna correctly to ensure signal stability
When using multiple sets of wireless microphone systems, such as the same series of products, it is best to use an antenna splitter if possible to minimize the mutual interference between the antennas, such as
If there is no antenna splitter, you should first adjust the antenna of the wireless microphone receiver to the best position, and then lay it out in parallel, keeping a proper distance between each wireless microphone receiver.
Distance (the antennas on each receiver cannot touch each other), so that each receiver has better receiving conditions, to improve the directivity of the wireless receiver, and avoid interference between frequencies
In order to obtain a better wireless signal. In addition, it is better to install extended antennas or active amplified antennas for large-scale performances to improve reception.

7. How to correctly identify the wireless microphone in use
When two or more handheld wireless microphones of the same model are used at the same time in a performance, each wireless microphone should be marked with a different color to prevent misoperation, and the mark should generally be attached
At the bottom of the handheld wireless microphone, a place that is not easy to block when holding the microphone, and the channel corresponding to the microphone on the mixer should also be pasted with the same color as the microphone
Mark or mark it. In this way, even if the actor takes the wireless microphone by mistake, the operator can also make the time when the host introduces the actor or plays (plays) the song.
Time corrected. In addition, you can also use the color microphone dust cover to mark, which can not only eliminate the "puff" and "puff" sounds, but also mark the microphone, which is really two birds with one stone
. Especially when singing duet or singing, it is more important to adjust the volume and tone of each microphone in time according to the color code.
For bodypack wireless microphones, in order to prevent wrong picking, you can first set the number or color of each microphone transmitter, and set the person and set before the performance. If there are several programs, alternate
For use, just in case, a dedicated person can register the person and machine after each change, and inform the operator of the registration to avoid operating errors.

8. How to prevent the silent phenomenon that may appear in the performance
In performances, singers always use hand-held wireless microphones alternately. After some actors use them, they may unconsciously turn off the power of the wireless transmitter or turn on the microphone.
Turn off to make the microphone in a mute state (the transmitter power switch and microphone mute switch of this type of wireless microphone are installed in a position that is easy to touch with fingers, so that the current actor can use
When using this wireless microphone, there will be an embarrassing scene where there is no sound from the wireless microphone, which not only affects the mood of the performer, but also affects the audience’s interest in watching, and may also make the operation
The personnel were caught off guard, and this must be taken seriously. In fact, when the power of the wireless microphone transmitter is turned off, the DIVERSITY transmitter on the wireless microphone receiver is displayed.
The indicator LED will go out. If the operator is using the wireless microphone, he can often check the working status of the wireless receiver when the program is changing.
of. However, if the mute switch of the wireless microphone is turned on, most wireless microphone receivers cannot display it. Unless the operator uses headphones to enter
Line monitoring (generally not realistic).
In order to prevent the wireless microphone from being silent, the operator should use glue for the wireless microphone transmitter power switch and microphone mute switch, which are exposed to such switches before the performance.
The cloth should be fixed, if there is a microphone switch protective cover, it should be used every time, so that the wireless transmitter and microphone are always in working condition to ensure normal performance.

9. How to operate the waistband wireless microphone
Waist-mounted wireless microphones generally use miniature electret condenser microphones. This type of microphone is highly sensitive and omnidirectional. It is easy to produce acoustic feedback during use, especially when used on stage.
In the case of using back-to-listening speakers, when this type of microphone is used for opera and sketch performances, if the stage is on the floor and there is a cavity under the floor, to prevent low-frequency resonance, the tuning should be adjusted
The bass gain of the channel on the stage is properly attenuated, and the signal output gain of the return listening system is also attenuated as necessary. Generally, the attenuation amplitude is above 6DB.
Passionate sketch performances can also cut off the signal output of the back-to-listening system to avoid acoustic feedback.

10. How to use the radio acoustic instrument system correctly
The radio acoustic instrument system is mainly suitable for sound sources such as electric guitars, electric doubles, electronic organs, synthesizers, and computer drums. The main difference from the wireless microphone system is the
with. The microphone pickup is a low-impedance output and the pickup of an electro-acoustic instrument is a high-impedance output (the microphone is 0DB output, and the electroacoustic instrument is -20DB output), so electroacoustic instruments are used
The LINE/MIC (line/microphone) switch on the wireless transmitter should be set to the LINE position; at the same time, the gain of the transmitter should be adjusted appropriately to adjust and control
Control the level of excessive distortion. The wireless microphone receiver should also set the LINE/MIC (line/microphone) switch to the LINE (line) position. In this way, not only makes electro-acoustic instruments and various
The impedance matching between the devices is truly achieved, the level is matched properly, and the performance of the electro-acoustic instrument can be maximized. If the LINE/MIC (line/microphone) switch is set
In the MIC/microphone position, it will cause distortion when connected to the /MIC microphone jack of the mixer. In severe cases, it will damage the equipment.

11. How to make the wireless microphone play the best effect
In order to make the wireless microphone play the best effect, the relationship between the transmitter output level gain, receiver output gain and mixer input gain must be handled properly, such as improper handling
If you do, the sound may be depressed, no penetration or sound distortion, or even excessive.
The correct operation method is to connect the wireless microphone to receive the receiver and the audio system power, and set the audio system level (0DB or +4DB), then turn on the power amplifier to the maximum output.
At the same time, set the main output volume of the mixer at 0DB, turn on the power of the wireless microphone transmitter, and set the audio output gain of the wireless microphone transmitter at 70%~75%.
And set the channel potentiometer of the wireless microphone input channel on the mixer at 0DB; finally, carefully adjust the mixer input gain, and if necessary, adjust the transmitter audio output slightly.
Gain gain until the microphone effect is satisfactory.
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