If you've played with Ham Radio Deluxe, you actually get a pretty complete panel to control your radio. There's also a digital VOX and PTT through the CAT interface.Īlmost all transceivers made since the mid 80s have some form of serial port interface which provide for the control of the mode, frequency, PTT and on the newer rigs, a lot more. For starters, the radio has settings for audio gain when running digital, aka the back input/output on the rig. Now, my current little HF rig, the FT-857 is not as simple to interface as some of the newer rigs like the Icom 7200 or the Kenwood TS590 which have built-in USB sound card and radio control, but it does provide a lot more functionality than my old 735. I also used an RS232 to PTT that was made with a resistor and the perennial 2N2222a. I started playing around with PSK31 when it came out in the late 90s, and my first interface was a simple cable from my sound card to the back of my Icom 735, no audio isolation. Because getting on HF digital has been as simple as hooking up your transceiver to the sound card of your computer, there's been a wide range of new applications and modes available to experiment with over the past decade. While I do have another interface I built a few years back on a PC board with isolation transformers, RS232 to PTT, VOX PTT and even a sound card to Morse keying interface, I prefer to use a more modular approach to interfacing HF transceivers to a sound card to use the various digital modes.
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