| Foreword: [With the increasing use of wireless microphones in different occasions, no matter how advanced wireless microphones with advanced wireless transmit and receive technology, the signal reception will be unstable due to some special features of the use. The following is based on the problems encountered by wireless microphones and some solutions to discuss with you. |
Overview of the way a wireless microphone is transmitted and received
Let us first take a general look at the way wireless microphones are transmitted and received. Most of the wireless microphones we use are working in the VHF or UHF bands. The radio signals in the VHF and UHF bands are collectively called radio frequency (RF), UHF bands. More utilized electromagnetic waves that are directly radiated. In addition to the direct radiated electromagnetic waves, the VHF band also utilizes a portion of the refracted and diffracted electromagnetic waves, so that under the same transmission power and propagation conditions, the transmission distance can be further. VHF technology is constantly being mastered, and the scope of application is becoming wider and wider. Therefore, in the space environment of our daily life, there are often many electromagnetic waves in the VHF band. The commonly used walkie-talkies generally work in the VHF band, so if we use Wireless microphones in the VHF band will have a much larger chance of being interfered. UHF technology is not yet mastered by many manufacturers, and because the cost of the circuit is much more expensive than VHF, the scope of application is not as high as VHF. Widely, the chance of interference with UHF wireless microphones will be much smaller. For this reason, most high-end wireless microphones will use UHF technology. UHF The propagation characteristics are more transmitted by direct radiation. Of course, it also has a certain penetrating power, but if it encounters an object with electromagnetic wave absorption characteristics (such as a metal substance), it will be powerless.
We can think of the transmitting antenna of the wireless microphone as an illuminant that emits light to the surroundings. The receiving antenna of the wireless microphone can be regarded as a sensor of light. When the wireless microphone transmits UHF signal, its transmitting power is generally 10mW (according to electromagnetic international regulations), the transmission characteristics of the UHF signal from the flashlight as if we, as the distance increases and weaker and weaker, so the wireless microphone there is a problem from the launch, and our wireless microphone receiver is like A sensor, as a receiving system, must have a received sensing value----the so-called receiving sensitivity (SQUELCH), which is like the threshold switch of the noise gate that we commonly use in professional audio engineering. Only the signal whose power is greater than this threshold can enter the demodulation circuit of the receiver. It can be seen that the length of the receiving distance can also be adjusted by adjusting the sensitivity. However, the adjustment sensitivity may also bring some disadvantages. When it’s high, it’s like when the windows in our house are too big, not only the fresh air Therefore, mosquitoes and flies are often easy to come in. That is to say, when the sensitivity is too high, it is easy to be disturbed by some weak noise (for example, mobile phones, high-frequency walkie-talkies), and vice versa. When using the sensitivity adjustment function, we should not greet the excessive receiving distance, but we should look at the food and eat, tailored according to the actual situation. Speaking of here, we should have a certain understanding of UHF wireless transmission and reception, below Let's explore the solution for stable reception of wireless microphones under special circumstances.
Solutions for stable reception of wireless microphones in special cases
1. There are no problems with the microphone when there are few people in the performance. When there are many people, there will be a frequency break. Our friends who often do performances will encounter such problems. During the rehearsal, the microphones have been used well, but one When the audience came, the frequency of the frequency break appeared at the crucial time of the official performance. In the above, we talked about the propagation of the UHF band is generally direct radiation, and some can also reach the receiver by penetrating obstacles and refraction. But when we are performing, especially during outdoor performances, there are all empty spaces around, so the refraction cannot exist. In the official performance, there will be a lot of audience, if the console is placed in the audience's golden listening. Position, the antenna of the receiver may be blocked by the audience. Although our UHF signal can penetrate a part of the viewer's body to reach the receiving antenna, the more objects the signal penetrates, the greater the attenuation. When the antenna is reached, its power may not be enough to open the receiver's sensitivity 'gate', which causes a phenomenon of frequency cut. The solution is as follows:
1.1 If a single wireless microphone is used, and the microphone has sensitivity adjustment function, we first adjust the sensitivity of the receiver to the maximum. If there is still a frequency interruption phenomenon, the microphone can be placed higher than the audience (most It's good to put it on the stage;) Or extend the antenna of the microphone to the outside, but we need an auxiliary device---the antenna amplifier, because it will bring some gain loss when extending the antenna cable. Adding an antenna amplifier can compensate for the gain loss caused by the coaxial cable.
1.2 If you are using multiple sets of wireless microphones , then we can't put so many wireless microphones on the stage, and it doesn't seem to be a real thing to pull a lot of antennas on the console. But ultimately We still have a way to solve this kind of problem. We can add another kind of device---the wireless microphone antenna splitter. This device can share several antennas with one antenna through the internal matching circuit, and then cooperate with the antenna amplifier. At this time, we will find two higher microphone brackets to support the antenna amplifier, so that we can solve the problem of stable reception when multiple microphones are used at the same time.
2, when the performance is relatively large, due to the large space for the microphone user to move, the transmission distance of the wireless microphone cannot meet the needs.
When we do large-scale concerts at the stadium, we often have to build a large stage, and we have to build several-story light fixtures, all of which are not conducive to the use of wireless microphones . As we all know, the standard transmit power of wireless microphones is 10mW. Due to the propagation in the air and the blocking and absorption of some substances, the distance of propagation is very limited. In addition, the sensitivity setting of the receiver will have a certain influence on the receiving distance. The transmission distance of the general wireless microphone For: 50~120 meters distance, if the environment used has strong electromagnetic interference or electromagnetic shielding, the launch distance may not exceed 50 meters. In summary, the wireless microphone will still accept a lot in large-scale performances. The test. However, if the antenna splitter and the antenna amplifier are used together, the problem of disconnection can be largely avoided. If we use four sets of wireless microphones , only one antenna splitter and two antennas are needed. Amplifier, make up a combination. Just let us use the coaxial cable to pull the antenna amplifier as close as possible to the side of the stage, if it can be fixed in the dance It's better on the stand of the stand. This condescending antenna installation method can ensure that the transmitted signal is not blocked in most cases, thus ensuring stable reception. Using this method we It is also possible to make some trade-offs. If we want to ensure strong reception stability, the distance between the two antenna amplifiers should be kept as much as possible between 50M and 100M, because we can use the automatic signal selection function of the microphone.
Overview of the way a wireless microphone is transmitted and received
Let us first take a general look at the way wireless microphones are transmitted and received. Most of the wireless microphones we use are working in the VHF or UHF bands. The radio signals in the VHF and UHF bands are collectively called radio frequency (RF), UHF bands. More utilized electromagnetic waves that are directly radiated. In addition to the direct radiated electromagnetic waves, the VHF band also utilizes a portion of the refracted and diffracted electromagnetic waves, so that under the same transmission power and propagation conditions, the transmission distance can be further. VHF technology is constantly being mastered, and the scope of application is becoming wider and wider. Therefore, in the space environment of our daily life, there are often many electromagnetic waves in the VHF band. The commonly used walkie-talkies generally work in the VHF band, so if we use Wireless microphones in the VHF band will have a much larger chance of being interfered. UHF technology is not yet mastered by many manufacturers, and because the cost of the circuit is much more expensive than VHF, the scope of application is not as high as VHF. Widely, the chance of interference with UHF wireless microphones will be much smaller. For this reason, most high-end wireless microphones will use UHF technology. UHF The propagation characteristics are more transmitted by direct radiation. Of course, it also has a certain penetrating power, but if it encounters an object with electromagnetic wave absorption characteristics (such as a metal substance), it will be powerless.
We can think of the transmitting antenna of the wireless microphone as an illuminant that emits light to the surroundings. The receiving antenna of the wireless microphone can be regarded as a sensor of light. When the wireless microphone transmits UHF signal, its transmitting power is generally 10mW (according to electromagnetic international regulations), the transmission characteristics of the UHF signal from the flashlight as if we, as the distance increases and weaker and weaker, so the wireless microphone there is a problem from the launch, and our wireless microphone receiver is like A sensor, as a receiving system, must have a received sensing value----the so-called receiving sensitivity (SQUELCH), which is like the threshold switch of the noise gate that we commonly use in professional audio engineering. Only the signal whose power is greater than this threshold can enter the demodulation circuit of the receiver. It can be seen that the length of the receiving distance can also be adjusted by adjusting the sensitivity. However, the adjustment sensitivity may also bring some disadvantages. When it’s high, it’s like when the windows in our house are too big, not only the fresh air Therefore, mosquitoes and flies are often easy to come in. That is to say, when the sensitivity is too high, it is easy to be disturbed by some weak noise (for example, mobile phones, high-frequency walkie-talkies), and vice versa. When using the sensitivity adjustment function, we should not greet the excessive receiving distance, but we should look at the food and eat, tailored according to the actual situation. Speaking of here, we should have a certain understanding of UHF wireless transmission and reception, below Let's explore the solution for stable reception of wireless microphones under special circumstances.
Solutions for stable reception of wireless microphones in special cases
1. There are no problems with the microphone when there are few people in the performance. When there are many people, there will be a frequency break. Our friends who often do performances will encounter such problems. During the rehearsal, the microphones have been used well, but one When the audience came, the frequency of the frequency break appeared at the crucial time of the official performance. In the above, we talked about the propagation of the UHF band is generally direct radiation, and some can also reach the receiver by penetrating obstacles and refraction. But when we are performing, especially during outdoor performances, there are all empty spaces around, so the refraction cannot exist. In the official performance, there will be a lot of audience, if the console is placed in the audience's golden listening. Position, the antenna of the receiver may be blocked by the audience. Although our UHF signal can penetrate a part of the viewer's body to reach the receiving antenna, the more objects the signal penetrates, the greater the attenuation. When the antenna is reached, its power may not be enough to open the receiver's sensitivity 'gate', which causes a phenomenon of frequency cut. The solution is as follows:
1.1 If a single wireless microphone is used, and the microphone has sensitivity adjustment function, we first adjust the sensitivity of the receiver to the maximum. If there is still a frequency interruption phenomenon, the microphone can be placed higher than the audience (most It's good to put it on the stage;) Or extend the antenna of the microphone to the outside, but we need an auxiliary device---the antenna amplifier, because it will bring some gain loss when extending the antenna cable. Adding an antenna amplifier can compensate for the gain loss caused by the coaxial cable.
1.2 If you are using multiple sets of wireless microphones , then we can't put so many wireless microphones on the stage, and it doesn't seem to be a real thing to pull a lot of antennas on the console. But ultimately We still have a way to solve this kind of problem. We can add another kind of device---the wireless microphone antenna splitter. This device can share several antennas with one antenna through the internal matching circuit, and then cooperate with the antenna amplifier. At this time, we will find two higher microphone brackets to support the antenna amplifier, so that we can solve the problem of stable reception when multiple microphones are used at the same time.
2, when the performance is relatively large, due to the large space for the microphone user to move, the transmission distance of the wireless microphone cannot meet the needs.
When we do large-scale concerts at the stadium, we often have to build a large stage, and we have to build several-story light fixtures, all of which are not conducive to the use of wireless microphones . As we all know, the standard transmit power of wireless microphones is 10mW. Due to the propagation in the air and the blocking and absorption of some substances, the distance of propagation is very limited. In addition, the sensitivity setting of the receiver will have a certain influence on the receiving distance. The transmission distance of the general wireless microphone For: 50~120 meters distance, if the environment used has strong electromagnetic interference or electromagnetic shielding, the launch distance may not exceed 50 meters. In summary, the wireless microphone will still accept a lot in large-scale performances. The test. However, if the antenna splitter and the antenna amplifier are used together, the problem of disconnection can be largely avoided. If we use four sets of wireless microphones , only one antenna splitter and two antennas are needed. Amplifier, make up a combination. Just let us use the coaxial cable to pull the antenna amplifier as close as possible to the side of the stage, if it can be fixed in the dance It's better on the stand of the stand. This condescending antenna installation method can ensure that the transmitted signal is not blocked in most cases, thus ensuring stable reception. Using this method we It is also possible to make some trade-offs. If we want to ensure strong reception stability, the distance between the two antenna amplifiers should be kept as much as possible between 50M and 100M, because we can use the automatic signal selection function of the microphone.
Overview of the way a wireless microphone is transmitted and received
Let us first take a general look at the way wireless microphones are transmitted and received. Most of the wireless microphones we use are working in the VHF or UHF bands. The radio signals in the VHF and UHF bands are collectively called radio frequency (RF), UHF bands. More utilized electromagnetic waves that are directly radiated. In addition to the direct radiated electromagnetic waves, the VHF band also utilizes a portion of the refracted and diffracted electromagnetic waves, so that under the same transmission power and propagation conditions, the transmission distance can be further. VHF technology is constantly being mastered, and the scope of application is becoming wider and wider. Therefore, in the space environment of our daily life, there are often many electromagnetic waves in the VHF band. The commonly used walkie-talkies generally work in the VHF band, so if we use Wireless microphones in the VHF band will have a much larger chance of being interfered. UHF technology is not yet mastered by many manufacturers, and because the cost of the circuit is much more expensive than VHF, the scope of application is not as high as VHF. Widely, the chance of interference with UHF wireless microphones will be much smaller. For this reason, most high-end wireless microphones will use UHF technology. UHF The propagation characteristics are more transmitted by direct radiation. Of course, it also has a certain penetrating power, but if it encounters an object with electromagnetic wave absorption characteristics (such as a metal substance), it will be powerless.
We can think of the transmitting antenna of the wireless microphone as an illuminant that emits light to the surroundings. The receiving antenna of the wireless microphone can be regarded as a sensor of light. When the wireless microphone transmits UHF signal, its transmitting power is generally 10mW (according to electromagnetic international regulations), the transmission characteristics of the UHF signal from the flashlight as if we, as the distance increases and weaker and weaker, so the wireless microphone there is a problem from the launch, and our wireless microphone receiver is like A sensor, as a receiving system, must have a received sensing value----the so-called receiving sensitivity (SQUELCH), which is like the threshold switch of the noise gate that we commonly use in professional audio engineering. Only the signal whose power is greater than this threshold can enter the demodulation circuit of the receiver. It can be seen that the length of the receiving distance can also be adjusted by adjusting the sensitivity. However, the adjustment sensitivity may also bring some disadvantages. When it’s high, it’s like when the windows in our house are too big, not only the fresh air Therefore, mosquitoes and flies are often easy to come in. That is to say, when the sensitivity is too high, it is easy to be disturbed by some weak noise (for example, mobile phones, high-frequency walkie-talkies), and vice versa. When using the sensitivity adjustment function, we should not greet the excessive receiving distance, but we should look at the food and eat, tailored according to the actual situation. Speaking of here, we should have a certain understanding of UHF wireless transmission and reception, below Let's explore the solution for stable reception of wireless microphones under special circumstances.
Solutions for stable reception of wireless microphones in special cases
1. There are no problems with the microphone when there are few people in the performance. When there are many people, there will be a frequency break. Our friends who often do performances will encounter such problems. During the rehearsal, the microphones have been used well, but one When the audience came, the frequency of the frequency break appeared at the crucial time of the official performance. In the above, we talked about the propagation of the UHF band is generally direct radiation, and some can also reach the receiver by penetrating obstacles and refraction. But when we are performing, especially during outdoor performances, there are all empty spaces around, so the refraction cannot exist. In the official performance, there will be a lot of audience, if the console is placed in the audience's golden listening. Position, the antenna of the receiver may be blocked by the audience. Although our UHF signal can penetrate a part of the viewer's body to reach the receiving antenna, the more objects the signal penetrates, the greater the attenuation. When the antenna is reached, its power may not be enough to open the receiver's sensitivity 'gate', which causes a phenomenon of frequency cut. The solution is as follows:
1.1 If a single wireless microphone is used, and the microphone has sensitivity adjustment function, we first adjust the sensitivity of the receiver to the maximum. If there is still a frequency interruption phenomenon, the microphone can be placed higher than the audience (most It's good to put it on the stage;) Or extend the antenna of the microphone to the outside, but we need an auxiliary device---the antenna amplifier, because it will bring some gain loss when extending the antenna cable. Adding an antenna amplifier can compensate for the gain loss caused by the coaxial cable.
1.2 If you are using multiple sets of wireless microphones , then we can't put so many wireless microphones on the stage, and it doesn't seem to be a real thing to pull a lot of antennas on the console. But ultimately We still have a way to solve this kind of problem. We can add another kind of device---the wireless microphone antenna splitter. This device can share several antennas with one antenna through the internal matching circuit, and then cooperate with the antenna amplifier. At this time, we will find two higher microphone brackets to support the antenna amplifier, so that we can solve the problem of stable reception when multiple microphones are used at the same time.
2, when the performance is relatively large, due to the large space for the microphone user to move, the transmission distance of the wireless microphone cannot meet the needs.
When we do large-scale concerts at the stadium, we often have to build a large stage, and we have to build several-story light fixtures, all of which are not conducive to the use of wireless microphones . As we all know, the standard transmit power of wireless microphones is 10mW. Due to the propagation in the air and the blocking and absorption of some substances, the distance of propagation is very limited. In addition, the sensitivity setting of the receiver will have a certain influence on the receiving distance. The transmission distance of the general wireless microphone For: 50~120 meters distance, if the environment used has strong electromagnetic interference or electromagnetic shielding, the launch distance may not exceed 50 meters. In summary, the wireless microphone will still accept a lot in large-scale performances. The test. However, if the antenna splitter and the antenna amplifier are used together, the problem of disconnection can be largely avoided. If we use four sets of wireless microphones , only one antenna splitter and two antennas are needed. Amplifier, make up a combination. Just let us use the coaxial cable to pull the antenna amplifier as close as possible to the side of the stage, if it can be fixed in the dance It's better on the stand of the stand. This condescending antenna installation method can ensure that the transmitted signal is not blocked in most cases, thus ensuring stable reception. Using this method we It is also possible to make some trade-offs. If we want to ensure strong reception stability, the distance between the two antenna amplifiers should be kept as much as possible between 50M and 100M, because we can use the automatic signal selection function of the microphone.
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