This sounds like ALE (automatic link establishment). Maybe someone could write a program using ICOM CI-V commands and embed a PIC processor to control the radio, provide I/O with the modem and set timing parameters. -- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida www.Leikhim.com JLeikhim at Leikhim.com 407-982-0446