What frequency do you use for wireless microphones?

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Welke frequentie gebruik je voor draadloze microfoons?

A wireless microphone is ideal for speakers, events, and content creators. No hassle with cables, just record your voice with quality in complete freedom. But did you know that you can't just use any wireless microphone in the Netherlands? There are regulations governing the frequencies on which you can transmit. The National Inspectorate for Digital Infrastructure determines which frequencies you can use. Don't worry, in this blog post, we'll explain the rules you need to follow so you can record with your wireless microphone without any hassle.

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1. What is a frequency

A frequency is simply a spot on the radio spectrum where a device, such as a wireless microphone, transmits a signal. Because there are many devices that work via wireless signals (microphones, routers, telephones, transmitters, etc.), that spectrum is limited. There are rules and agreements to prevent interference with other devices. Who is allowed to use which frequency? In what way and in which country/region. In the Netherlands, the National Inspectorate for Digital Infrastructure determines which frequencies you are allowed to use.

2. Which frequencies are you allowed to use?

There are a number of frequency bands that are license-free. In other words, you may use them without a license as long as you meet the technical requirements. See the table below.

3. When do you choose which frequency?

  • For home use or in small venues, choose a model that operates at 863-865 MHz.
  • For professional use, such as in a theater or at large events. Consider the 823-832 frequency band. If you want to use multiple systems at the same time, choose the 1,785 and 1,800 MHz frequency band.

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4. What is mW eirp?

With wireless microphones you often see ''maximum 10 mW eirp''. But what does that mean exactly?

mW stands for milliwatt, this is a measurement of power. So how strong the signal is. Eirp stands for Equivalent Isotropically Radiated Power . It is the measurement of how much power an antenna effectively transmits in a certain direction, taking into account the gain of the antenna. It helps to determine how "strong" a wireless signal is that is sent out.

In simple terms, it indicates how powerful the signal actually is that comes out of the microphone. So not only what the device itself transmits, but also how it is amplified by means of the antenna.

Example:

  • Your wireless microphone transmits at 10mW
  • The antenna amplifies that signal by +3dBi
  • The Eirp is 13 mW (without cable loss)

5. What to look for when purchasing a wireless microphone

  • Always check whether the wireless microphone is suitable for use in the Netherlands
  • Check whether the manufacturer clearly states which frequency the wireless microphone operates on
  • See how far the range is. Usually between 10-30 meters is enough.
  • Please note the transmit power (eirp)
  • Check if the system works without interference next to WiFi or Bluetooth

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Frequently Asked Questions

What frequency is legal in the Netherlands for wireless microphones?

In the Netherlands, the frequency bands around 863-865 MHz and part of 470-790 MHz are permitted for wireless microphones, depending on the license you have.

What does 'license-free' mean for frequencies?

This means that you can use the wireless microphone without needing a permit. Provided you stay within the specified frequency band.

Why are some microphones available in multiple frequency bands?

Because they must be able to operate in different countries, environments and situations without interference or violation of local regulations.

In addition, the radio spectrum is busy: there are also wifi networks, mobile phones, TV channels, walkie-talkies, etc. that use it. If two devices use the same frequency, you get interference. Multiple bands offer flexibility to switch to a "cleaner" band.

At concerts, festivals or TV recordings there are often dozens of wireless microphones. By using different frequency bands, you prevent interference between microphones of the same set.

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