(look in the PTT methods row)
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OK.? I was wrong about the regular digirig mobile -- it can't do the "RA Board" PTT method.? It can do PTT via CAT command or by COM port RTS line (for radios without CAT, like HTs).
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The Digirig Lite and DR-891 can both do PTT via GPIO3 (aka "RA Board" which is the GPIO 3 pin of the C-Media 108 usb sound card chipset) and Active VOX on the right audio channel (never used it, I guess it does "real PTT" when it hears something on the right channel).??
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The DR-891 can also do PTT via CAT command.
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I remember doing the GPIO3 (RA Board) method with Digirig Lite and an HT and VARA FM because I did it recently.? Before when I did FLDIGI, AndFLMSG, and PSKDroid with a regular Digirig, I must have used RTS on the serial port (no CAT commands on HTs).
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For the GPIO3 (RA Board), VARA FM supports it by the name "RA Board", and I believe I believe on FLDIGI it's under the name Cmedia with GPIO-3 IIRC.? FLrig and others also support COM port RTS line for PTT for the regular digirig.
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I believe it's called "RA Board" because of another product called "RA Board" from Masters Communications that also uses a similar C-Media USB soundcard chip as digirig (or vice versa -- I think the Masters Communications boards have been around longer than digirig).
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Hope that clarifies.
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W4MRP