![]() ![]() ![]() Using the optocoupler gives total isolation between the computer and IC-7200 so there are no "ground loop" hum bars in the waterfall. I added a few layers of heat shrink to the DIN (MIDI) cable so that it fit tightly in the end of the serial housing. The optocoupler, resistor, and diodes fit neatly inside the DB-9 serial housing. I used DB-9 serial sockets, DB-9 housings, optocouplers, 100 ohm 1/4 w resistors, 1N4001 diodes, and for the 13-pin DIN plug, I purchased a MIDI cable (digital audio for synthesizers) and used it for the ready wired plugs. This is used with a serial to USB adapter, of course. Some use the optocoupler, some use a reed relay. This is basically the PTT portion of many homebrew digital interfaces, and some commercial ones. I made up some cables via the schematic attached. ![]() I could put a signal on the air by pressing the microphone's PTT button. Even though the digital program would generate audio for transmitting, I could not seem to find a way to make the radio kick over into transmit. I could receive digital, see the traces on the waterfall. Up to now I have not been able to make this work. This radio is supposed to work digital modes with only this cable, no "interface" needed. The Icom IC-7200 has a direct USB connection to computer with the IC-7200 having a built in sound card. ![]()
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