currently a working copy - transmits ground APRS packets regularly and then switches to ARISS mode when in view - howevere currently can not change radio frequency. Currently activating the radio using VOX - the arduino sends a tone to key up the radio and then transmits the packet, after a delay it does another tone - this is to allow the VOX to detect a clear tone and then release the key otherwise it stays open with the general noise. As a backup have also setup the radio to time out after 15 seconds.