I have both those radios and they can work together with data. First item as you saw is 5100 has "fast data" mode. THis does not exist on the 7100 or other older DStar radios. Just FYI, "Fast Data" is the ONLY data option on the Kenwood TH74 and TH75. "Fast Data" is OK, but it works by taking all the bandwidth including what you may have wanted for voice. It's faster but for chat it's not noticeably faster. D-Rats chat is very fast. In my experience (extensive) it's as fast as "fast packet" and FASTER than VARA chat. Yep. VARA? is error corrected and that overhead slows it down on chat. D-Rats chat is raw data---no correction--makes it really fast but can have errors.? On file transfers, well, it blows D-Rats away.?
If both your radios are on slow data, make sure BOTH radios have your data mode set to "DV Data". NOT CI-V!? This is a common problem where D-Rats data does not seem to work. To use your phone app you swich to CI-V. You have to switch back for D-Rats.?
Other than that, I don't know why they don't talk to each other. And D-Rats was designed for simplex. It's actually faster in simplex.?
One thing to add for this thread---back before some of the updates I got the "D-Rats Repeater" to work here, so I could connect a TNC-X (yeah, hardware works fine) on an 880H to D-Rats as well as another radio using D-Rats seriall data and they bridged chat. I would transmit chat on the 880H (packet, not D-Rats) it came into D-Rats then re-transmitted out on say my 5100 as DV Data. Every connection saw everything in chat. Now I can't get it to work at all. I wonder if something broke in some of the D-Rats updates over the past few years??
