|Computer interface for digital modes.|
A DIGITAL MODES FULLY ISOLATING COMPUTER INTERFACE
Nothing here thatís Rocket science, but if you want to make sure your radio doesnít upset your computer then this is a simple way to achieve it.
Transformers for sound isolation and opto-isolators for control.
The PCB is designed to fit into a Farnell box 318-3567. You will be able to plug the box directly into the serial port, then make up two 3,5mm leads with phono plugs each end to connect the computer MIC and EAR jacks to the corresponding ones on the board.
The Radio connector is a 8 pin round DIN socket wired mostly to a Raynet standard called CAIRO. The audio paths are isolated from the PTT and KEY lines so you can easily interface the board to any radio, even a handset! Multi-turn cermet pots are used to set levels.
DIN socket RS 453-117 1.348 EACH
Transformer RS 210-6223 X2 2.55 EACH OEP1200
Opto isolator RS 453-1205 0.95 EACH ISOCOM ISP825X
3.5MM Jack socket RS 476-328 X 2 0.696 EACH
Box Farnell 318-3567
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