He tells us that every country has a different system: “In England every town is assigned certain frequencies, and you have to keep to those. In Germany, on the other hand, a defined spectrum is available, and it is the sound engineer’s job to decide which frequencies to use within a given range. In the USA the rules are quite simple. Certain ranges are reserved for LTE or other purposes and they may not be used. However, all other frequency ranges are essentially available. In the United States we can work with an output power of 100 mW, whereas 50 mW is customary in Europe. But only 10 mW is allowed in Japan, which to my way of thinking is really not much at all.”
Throughout the world, besides LTE, the transmission of digital television signals is another reason for the ever smaller frequency ranges available for events. According to Horst Hartmann, “In Germany the nationwide introduction of DVB-T2 is a major topic at the moment. Internationally, too, digital television cannot be ignored. In Italy and England, I was faced with interference from TV channels recently, and digital television is also on the agenda in the USA.” Audio specialist Sennheiser is one place where Hartmann can count on competent support. Hartmann is satisfied: “So far, Sennheiser’s support has always worked very well in all countries.”
When working on major productions, he takes his own wireless setup along. “If I’ve got a groundbreaking receiver such as the Sennheiser EM 3732-II with me, then thanks to a switching bandwidth of up to 184 MHz, I’m on the safe side anywhere in the world,” is how Hartmann sums up his experience. Many top stars work with personalised microphones that attract attention due to their spectacular appearance. Hartmann knows: “Working with sound icons such as the Sennheiser SKM 5200-II ensures a stress-free situation. Owing to the huge switching bandwidth, it is possible to hire a suitable receiver anywhere in the world.”
“All over the world, the frequency ranges that can be used are becoming ever narrower.” But Hartmann is convinced that “in the medium-term, UHF is the best range for wireless audio signal transmissions for professional events”. He continues: “Products with a larger switching bandwidth are without doubt a good choice for worldwide applications, and in the UHF range we will certainly be using the 500 MHz band for a long time to come.”
For musicians, Sennheiser already has future-proof innovative wireless microphone solutions with extremely attractive price/performance ratios in the shape of the evolution wireless G3-1G8, evolution wireless D1 and others. And of course, even for those Sennheiser products that do not operate in the UHF range, a perfect performance and first-class sound are guaranteed!