Obtained years ago (look at my serial number 000A) from his creator BG5ROJ Xuan Wang, I recently brought back to life this marvellous piece of hardware, that is indeed a great portable solution for the digital enthusiast in the field.
The digital modem can encode/decode BPSK31/63, RTTY, QPSK and CW modes without a PC, specially designed for portable digital communication. With its internal high performance DSP chips can process radio data. The internal micro SD card can save regular logs and real time audio data including FFT data as well!
Its external USB host interface can be used for a USB Keyboard or keyboard using RF 2.4 GHz dongle. The modem uses AA batteries or 4.2v lithium battery for power, and it is firmware upgradable for futur enhancements and new features.
The operating manual, cheat sheet, and the latest 1.04c firmware are available from my blog.
73 de Jeff | VA2SS