Wireless microphones provide us with great convenience, very free to move, and extremely simple to use. But they are not without shortcomings. The following will discuss how to use wireless microphones correctly to maximize their strengths and avoid weaknesses.
About frequency
A complete wireless system consists of a transmitter and a receiver, and they must be set to the same frequency.
The United States Federal Communications Commission (FCC) has allocated the frequency bands that can be used.
In the United States, the frequency bands used by wireless audio systems are:
VHF low frequency band (49-108 MHz)
VHF high frequency band (169-216 MHz)
UHF low frequency band (450-806 MHz)
UHF high frequency band (900-952 MHz)
UHF system has better performance than VHF system.
These wireless frequencies are also used in wireless microphone systems in television stations, communication equipment, and other fields.
Due to this wireless frequency sharing, other people in the same area may use the same frequency as you.
The government has also stipulated some other technical indicators, including restrictions on greater transmission power.
If two transmitters work on the same frequency, interference will occur, making the wireless system unusable. At the same time, two transmitters cannot use only one receiver.
Increasing the squelch parameters on the receiver can improve the protection against interference, but it will reduce the range of use. Adjust the squelch to a position that can reliably reduce the noise to a lower level.
Turn off unnecessary electronic devices, especially computers, CD players, and other digital devices. These are common sources of wireless interference, especially when they are near the receiver.
If you must use a computer or digital device, make sure that it is at least 3 feet away from the receiver and antenna.
In actual use, the larger working range of a wireless system is different. If it is in a crowded room, it may be only 100 feet, while in an open outdoor, it can reach 1,000 feet.
The operating range of the diversity system is almost certainly better than that of the non-diversity system.
The receiver must have one or two external antennas, and there should be an open transmission space between these antennas and the transmitter.
Tips for new users
1. Tell the host how the sound engineer controls the microphone switch. Paste the switch on the transmitter so that they don't touch it.
2. Consider in advance which direction the host's head is most likely to turn when facing certain people on the stage or in the auditorium. If you can't pin the microphone in the middle of your tie or shirt, then pin it on the side he/she is most likely to face.
3. The extra thread must be securely fixed to avoid entanglement on the armrest of the chair or affect the surface finish. The use of small lapel clips or "hair clips" can help users fix the cord in the desired position.
4. If possible, the transmitter/belt bag should be fixed to the host’s belt or belt-not to be thrown in the pocket. Because you don't know what else is in your pocket. If the host puts his hand in his pocket, he may unintentionally pull the cord or touch the switch.
5. One of the main advantages of wireless microphones is that they can move freely, but unfamiliar users may move too much and get to the front of the speaker, which may cause feedback problems. All users should be reminded to avoid getting close to the speakers.
6. If the host has to go around on stage or in the studio, or show up in several places, then tell him what to do if the signal is lost. Even high-quality wireless microphones will experience signal loss. Taking a step to the side, even a slight deviation, may solve the problem of loss, and the host can minimize the interruption and continue his performance.
About the battery
1. Some wireless problems, including completely no signal, reduced working range, sound distortion and interference, are usually caused by low or dead batteries in the transmitter.
2. Use new high-quality alkaline batteries. Other types of batteries (such as zinc-carbon batteries) have a shorter service life.
3. If you have any questions about the battery, then replace it. Do not mix old and new batteries.
4. Regarding rechargeable batteries:
·If you must use rechargeable batteries, use longer-lasting nickel-metal hydride batteries, lithium-ion batteries, or lithium polymer batteries instead of nickel-cadmium batteries.
·Pay attention to the actual voltage. Some rechargeable batteries that display 9 volts may only have 7.2 volts or 8.4 volts-or worse, 9.6 volts.
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