A group of radio frequencies that are close together is called?

• A. Spectrum
• B. Band
• C. Multiplex
• D. UHF configuration

Answer: (B)

A range of frequencies that are close together is called a band. In radio terminology, a band refers to a contiguous portion of the spectrum with defined lower and upper limits, used for a specific type of communication (for example, the 2.4 GHz band or the FM band). The entire range of frequencies available for use, across all bands, is the spectrum, so spectrum is a much broader concept. A multiplex is about combining multiple signals for transmission over one medium, not about describing a group of adjacent frequencies. The term “UHF configuration” isn’t a standard way to describe a set of frequencies; UHF is just a portion of the spectrum, not a generic label for a frequency group. So the correct term for a group of closely spaced frequencies is a band.