The fact that the letters represent tones in this situation, still doesn't really help any. When you say that these were tones, does that mean that the device used to receive these radio transmitions was hooked up to a speaker? My point is that in oder to effectively send and recieve radio transmitions, the device that's doing the sending has to be similar to be to the device that's doing the receiving. For example, right now I'm sending a transmition over my modem, which is being received by your modem. If you were to receive this message by picking up the phone and listening to the transmition, it would sound like static, and no matter how hard you tried, you wouldn't be able to decode what the hell was going on. When we send auditory signals, we use a microphone to translate the sounds into an electrical wave form. Then the radio transmitter takes that wave for and translates into a radio wave. The person on the other end has a device that retranslates the radio wave back into an electrical wave, which sends it to a speaker that retranslates it back into an auditory wave.Let's say for example that an alien race communicates by glowing different colors of light. They might invent a machine that converts different patterns of light into a radio wave, which then transmits it to a receiver which then retranslates it back into a light pattern. If we were to intercept that signal with one of our radios, it wouldn't make any sense at all, and we'd never guess that it was supposed to be light. HOw we interperate the radio signal depends entirely on the device we use to receive the signal.