I have the 1.0 version of Lite and I notice that it does not reliably trigger PTT on certain radios. If I swap in my home-brew version of the DigiRig lite, it does work as does a Masters Communication DRA-50 (which also uses GPIO PTT). In my case, I think the resistor driving the transistor that controls PTT was too high in the original version. I used a 10K resistor on my home brew card and it works fine. It seems to be radio-dependent, though. DR Lite 1.0 works great on a Kenwood TM-D710G or BTech HT (Linux or Mac or Windows PC), but not on an Anytone AT-D578.
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