AKARSH SHEKHAR
How To Make Your Wireless Microphone System Work Better
There are wireless microphones that have the purpose of capturing any sound source , converting these pressure differences into an electrical signal , and transmitting it to another point without the need to use a cable , allowing greater user mobility and at least the best possible audio quality .
The way to transmit the signal without the need for a cable is through the air and they achieve it by compressing the signal and mounting it on a carrier signal . In the receiver , they separate it from the carrier signal and then decompress it , but in that compression and decompression noise , distortion , and some coloration are added to the sound . The less the signal is altered , the better the systems are in terms of performance .
To transmit over the air , two frequency bands are commonly used : VHF ( Very High Frequency ) which occupies the frequency range from 30MHz to 300MHz , and UHF ( Ultra High Frequency ) which occupies the frequency range from 300MHz to 3GHz . Currently , the most prestigious brands on the market only manufacture equipment in the UHF band from 300 MHZ to 800 MHz and no longer in VHF because it is a more saturated band and prone to interference .
The technology on the market has managed to obtain a response graph very similar to that obtained by a cable .
Another problem is the number of microphones that can be used at the same time , for example , there are systems that allow at most nine microphones to work at the same time from the same series , this is because they cannot be assigned a different frequency . Either because the range of frequencies in the operating band is very small or because of the limited number of available frequencies due to the minimum separation between one frequency and another to avoid interference due to central frequencies and harmonics .
Another real problem is when different wireless microphone systems are used at the same time and we do not know if they are compatible or if they will interfere with each other . If this is added to the frequencies of the wireless pointers , the frequencies of the wireless intercoms , the television channels , and some other signal on the air that can interfere , then we really have a problem , because we work blindly in most cases and do not take the necessary preventive measures to reduce problems as much as possible .
The most accurate way to know what is happening in the radio frequency spectrum is to use an RF spectrum analyzer to know the empty spaces , the central frequencies , the harmonics of considerable gain , and all the frequencies occupied by other equipment .
The best wireless microphone systems on the market include software that , together with the physical equipment , do a scan to find the best available frequencies and auto-programs itself to those free frequencies . Some of the best systems allow up to 40 microphones to work at the same time in the same frequency band . Through a scanning function , this equipment can know how many free frequencies it can occupy , and via the network , it can program all the receivers automatically . Then , each transmitter can be programmed through a port infrared at the same frequency as the receiver .
If you do not have a spectrum analyzer of any kind and you are using different systems from different brands , then you must know in which frequency band you are operating and program the microphones that are not in the same band first , in order to achieve the maximum amount of microphone . operating at the same time , you could also use the antenna combiners and high-gain antennas for systems that allow these accessories and thus reduce reception problems .
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