... declarative, imperative, interrogative and S Verb Objectexclamatory for the syntactic forms, and they use statement, command, Pre Adverb Conj S Verb Objectquestion, and exclamation for the function.Prep ... broadcasts and 25 kHz used by TV sound.Civil and military HF (high frequency) voice services use shortwaveradio to contact ships at sea, aircraft and isolated settlements. Most use single sideband ... unused carrier and sideband.TETRA, Terrestrial Trunked Radio is a digital cell phone system for military, police and ambulances. Commercial services such as XM, WorldSpace and Sirius offer...