Wireless Microphone Frequencies


VHF (Very High Frequency) wireless microphones operate within the range 173 - 175MHz, and these are freely available for the public to use without a licence. They are usually at the cheaper end of the scale, and can be more prone to interference. You can only use two wireless VHF microphones in the same place at the same time because the available bandwidth is so narrow. e.g. you can use two of these systems (on different frequencies) at the same time QTX VH1 wireless system. Alternatively you could use one dual UHF system.



UHF (Ultra High Frequency) microphones operate on wider bandwidths than VHF, some of which can only be used legally under licence from Ofcom.

Pre-set frequencies or changeable?

Some wireless systems are pre-set to fixed frequencies that you cannot change. VHF tend to be pre-set. Some UHF are pre-set and some are changeable, allowing you to select your frequencies within a range. This is useful because you'll find that some frequencies work better than others in your area. If a frequency doesn't work well or has a lot of interference it can dropout, sound crackly, or even sound like it's underwater! Change a few MHz and it will be as clear as anything.

True Diversity

True Diversity means is that the transmitter sends two signals to the receiver on different frequencies which are then summed at the receiver end. This reduces the amount of drop-out or signal loss. If you have a wireless system that is not true diversity it could be prone to drop out.

Ofcom Licensing

Ofcom control the licensing of wireless microphones and monitors. Their website is very confusing and it's sometimes easier just to call them! However, please click here for the correct section on the Ofcom website

Alternatively you can contact the PMSE department as follows:

PMSE Licensing
2nd Floor Riverside House
2a Southwark Bridge Road
Tel: 020 7981 3803
Fax: 020 7981 3235
E-mail: pmse@ofcom.org.uk

As at Sept 2018, it's £28 per year for a fixed site indoor licence and £75 per year for a shared licence covering up to 10 microphones.

Would you like some help?

If you'd like us to help you choose your microphones, just click here to fill in our simple enquiry form.

If you have any other questions about the wireless products sold by us please email enquiries@whatpa.co.uk  and we will do our best to advise you.