Hi,
Just to chime in here:? I used the EASY DIGI and a cheapo USB-to-RS232 I bought at the local electronics store.? Wired everything up in the conventional way, tied the EASY DIGI's PTT-HI to the uBITX mic ring, and its PTT-GND to the uBITX mic ground.? Works fine.
Not that I didn't have technical difficulties, but they were all on the laptop side.? First, the USB RS232 dongle didn't work until I sacrificed several hours to the driver gods.? It's a good thing I had the presence of mind to unit-test that part with a voltmeter before I did anything else.
Next, the laptop failed half the time to detect my audio jack, and the other half the time it sensed the jack but failed to detect any audio.? It turns out that was a simple line-level problem:? if the mic input was too strong, the computer would just assume no valid device was plugged in.? Eventually I learned that I could start the uBITX on the lowest volume level, plug in the audio jack, and raise the volume if necessary; everything would work.
Thanks, Xcott K2CAJ