Hi Brian, Try www.picpoint.com and find for my fsk-modem project. It may be valuable for you. regards, Rildo Pragana On Wed, 30 Jul 1997, Clewer,Brian wrote: > Hi, > > I am planning to simulate a modem ic within my application (to keep down the > component cost). Can anyone tell me what the FSK frequencies are I need to > implement this? > > Thanks for any help, > > Brian. >