Use APKPure App
Get JT65android old version APK for Android
Receive and transmit JT65 with your transceiver on your tablet or phone.
This application realize the JT65 protocol as described by K1JT.
In order to work optimally your transceiver must be connected to your android device with an audio cable for audio in and out. On the android device is this a 4 rings connector.
For PTT operation it uses a usb-serial adapter and toggles the RST line.