tower atc

I am a very new user here, I have successfully programed in my local tower, ground, and ATIS channels into my BCT15X, however, I do not know what the appropriate modulation is for these frequencies (AM, NFM, FM, WFM, FMB), does anyone know what modulation I should choose (will auto do the...

I live a mile out from Midway Airport Chicago and have been monitoring Midway tower for over 30 years. A little over a month ago the tower frequency (118.7) has been broadcasting a carrier signal similar to having an open key on the channel. When either the tower or an aircraft transmits there...