ISM

A bandA specific range of frequencies. Usually smaller and more specific than what’s referred to by spectrum. You would refer to the AM radio band, not the AM radio spectrum. That’s where CB – Citizens’ Band – comes from. of frequencies that anyone can use. In order to avoid interferenceWhen two radio signals exist at the same frequency, you end up with a combination of both. They are then said to be interfering with each other, meaning that they mess each other up., there are rules as to how one can broadcast on this band so that everyone plays nice together.