I have a doubt: I know the comm frequencies between the tower (ATC) and pilots is in the range of 108 MHz up to somewhere 150 MHz, right?
But what type of modulation (AM or FM) do their transmitters use?
And the ATIS (automatic wheather information system), what frequencies and modulation use? Is there another acronym for such a system? (the tower frequencys are sometimes refered as TWR).