I have recently built and tested an interface to my PC that uses the sound card line out for DTMF tones. In addition the interface uses DTR from the PC's COM1 serial port for keying a radio. This interface uses transformer and optical coupling to connect with a local up-link radio used to program the repeater over-the-air when all other means to program the repeater controller are down.
I have used the imbedded ARCOM (RCP) controller software (Windows XP) useful for programming their RC210, but some of its parameters are not adjustable to suit my needs. Is anyone using a PC to Radio DTMF program (DOS, Win98 or XP, I don't care) they would like to share? I have looked at a few Freeware Dialers found on the Internet, but none have the ability to key an external device via a serial port control/handshake signal. Thanks, Jim WA6VPL
