Choosing the correct radio microphone frequencies can be a confusing matter, and with the impending changes to frequencies in 2012 there is even more opportunity to get confused.
Having recently attented an ISCE conference on the subject, I am going to attempt to provide some hints and tips. In this post I am going to concentrate on the use of the free channel 70 and the impending changes to the shared channel 69.
- Usually (although not always) when we turn a new radio microphone on it will tune to one of four free frequencies in channel 70, but what if it doesn’t, what frequency should you choose?
Channel 70 (free) uses the frequencies 863 to 865 Mhz.
- What happens if I use a frequency other than 863 to 865 Mhz.
Since these frequencies are the free (unlicensed) ones, then any other frequency will require you to have a licence which is available from jfmg.
As discussed previously on this blog, channel 69 is being sold of by the government for use by the mobile phone operator’s new 4G networks. As a radio microphone user this means that any equipment designed to work in channel 69 (854 to 862 Mhz) will not be usable from the end of 2012, and I mean not usable, any signal it will be obliterated by the mobile phones.
- What equipment will I need for a shared licence after 2012?
After 2012 the shared licence will move to channel 38 (606 to 614 Mhz) and new radio microphone receivers will be required to operate at this frequency. Any new equipment will not be usable in the free channel 70 (they are simply to far apart in frequency terms).
- Will I still be able to use my current equipment?
Your current equipment will continue to work in channel 70 (the free channel) although there may be some increase usage (and therefore an increased risk of interference) in this channel. This is due to situations where channel 69 is currently being used in error.
In my next article I will discuss the type of licence best suited to use in a church or charity situation.