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.

Discover the possibilities of wireless microphones

4. What is mW eirp?

Wireless microphones often say "maximum 10 mW eirp." But what exactly does that mean?

mW stands for milliwatt, a measurement of power. This indicates the strength of the signal. EIRp stands for Equivalent Isotropically Radiated Power . It's the measure of how much power an antenna effectively radiates in a given direction, taking into account the gain of the antenna. It helps determine the "strength" of a wireless signal being sent outward.

In simple terms, it indicates the actual strength of the signal coming from the microphone. This includes not only what the device itself transmits, but also how it is amplified by the antenna.

Example:

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

Want to know more about how wireless microphones work? Read our blog post " How does a wireless microphone work? "

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
  • Check the range. Usually, 10-30 meters is sufficient.
  • Please note the transmission power (eirp)
  • Check if the system works without interference in addition to WiFi or Bluetooth

Find a wireless microphone here

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.

Looking to buy a microphone? Read our guide to the best microphones .

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