Why frequencies from the TV UHF spectrum?
– Only the TV UHF spectrum adequately prevents disruptive body interference.
Artists want to move freely on stage with their radio microphone. This is possible only at 470 to 694 MHz, since body interference is minimal within this frequency range (it’s not for no reason that pacemakers use the frequency band around 400 MHz).
Body interference increases at higher frequencies. This causes unwanted directional effects to occur. The artist may end up in dead spots while moving around on stage.
Physically, the wavelength must be longer than the diameter of the body. This does not occur at higher frequencies. Only TV UHF can do this.
– Radio waves in the TV UHF spectrum can penetrate stage structures.
Theatre decorations are made of complicated steel or aluminium constructions, which strongly impair the transmission of radio waves.
The radio waves are transmitted and spread so well in the UHF range that they reach the receivers on the mixing console undisturbed by such setups.
Higher transmitting power cannot compensate for this, because the transmitting power of our microphones is limited by law. It would also significantly reduce battery life. Larger batteries and transmitters are not an option.
The audience would see them on the costumes.
– Only the TV UHF spectrum allows for touring artists to travel throughout Europe with their own sound system.
Musicians on tour use the frequency range between 470 to 694 MHz.
Most sound equipment is produced for this spectrum. This range is harmonized in Europe.
We want to preserve that.