When it comes to working with sound, working bands and radiofrequency equipment are two essential concepts. We explain everything about them below.
What is radiofrequency?
Radiofrequency is the radio frequency spectrum in which electromagnetic waves are transmitted by applying the alternating current created in an antenna or generator.
total radio frequency spectrum.
Work belts
VHF (Very High Frequency) and UHF (Ultra High Frequency) radio systems are known as working bands. UHFs are generally chosen because the probability of interference is much lower because there are fewer systems in operation and because the frequency spectrum available is greater.
VHF or UHF frequency spectrum
However, VHF systems also have their advantages. On the one hand, they are more affordable in the market. On the other hand, the variety of products available is greater and, moreover, their quality in most cases is superior. They are also easier to use. And finally, they are better prepared to work in worse conditions. These products can be found in professional companies in the sector.
Equipment
Within the teams, we found the following elements:
Antennas: The antennas are tuned for a certain frequency range or for a specific frequency. The size of the signals is directly linked to the wavelength of the signal to be received. In terms of their location, in most cases they are located on microphone feet.
Cables: For cables, RG-58, RG-59 or RG-213 coaxial cables are used; all have an impedance of 50 ohm. Note that the larger the section, the better the signal transmission quality is.
Connectors: They deserve special care because they are one of the most sensitive parts in any type of installation. Before putting them in place, you should know what type of connector you need and carefully check that they are not bumped and that the welding is good.
Distributor: is a key element for multi-channel systems. It is an antenna distribution system, which can be either active or passive. Its main objective is to extend a transmission system. It is usually used in microphone racks as a connector between the output of an antenna and two or more receivers.
Combinator: In the same way as the distributor, it is an element that multi-channel systems need to operate. The combiner, as its name suggests, combines several signals into a single output. It is usually used in broadcasting with a single antenna signal from different transmitters.
Filters: They are used to eliminate any harmonic generated by the amplifier.
Amplifier: They are placed at the input of a coaxial cable and serve to amplify the signal at the antenna output.
Racks: these are wireless microphone systems.
In essence, this is the performance of working bands and radio frequency equipment in use.