TCM modem

Here is one of our first projects for packet radio. It is 1200bps FSK modem wich can be connected directly to COM or parallel port on PC. No power supply is needed for TCM modem operation. With appropriate software you can work on packet radio with handy RTX. Many copies and clones were produced later. I will published soon on this site complete schematic, PCB in Tango format, mybe also PCB in Gerber format.

Here are some pictures.