Q1. Why are higher frequencies assigned a higher bandwidth? Reasons for asking the question: My book quote "FM came late than AM waves and had to use higher frequencies than AM....... The greater range of frequencies available means that each station has a greater bandwidth......." If the equation is Bandwidth * Number of stations = Frequency Range, then it doesn't matter if the frequencies are of higher or lower order, for a given number of stations they both have the same bandwidth. Q2. Why do FM waves have an infinite number of frequencies? Reasons for asking the question: My book quotes " The frequency spectrum of a carrier is much more complex. In particular, there are many frequencies associated with an FM wave." Many more sites state that FM waves a theoretical limit of infinite frequencies. Q3. Why do FM waves are given a higher bandwidth than AM waves? Reasons for asking the question: My book quotes "In particular, there are many frequencies associated with an FM wave. This means that FM waves need a greater bandwidth for each station." I find a little flaw with this argument. If I were to use an AM wave with a signal having a high frequency, the AM wave will also be having a high bandwidth. Then why associate high bandwidths with FM?