FLMSG - Amateur radio messaging tool FLMSG is a simple forms management editor for the amateur radio supported standard message formats. Form data can be transferred between computers either using standard internet email or via radio frequency broadcasts typically made by an amateur radio operator on your behalf. flmsg forms can be very complex and include embedded images and other controls that make data entry less prone to error. FLMSG sits on top of FLDIGI, which does the real signal processing.