-We describe the design and development of a portable software radio prototype device built primarily using commercial off-the-shelf components and open-source software. The device components include a generalpurpose processor (GPP) on a small-form-factor motherboard, radio hardware, touchscreen and LCD, audio microphone and speaker, and an internal battery enabling hours of mobile operation. This device demonstrates that a GPP-based software radio can be implemented in a portable-form-factor using current technology. We describe the design and selection of hardware components, identification and modification of the operating system, and installation of the selected radio software. We discuss trade-offs in the selection of hardware and software, decisions that proved to be stable throughout the lifetime of the project, issues that arose, and lessons learned along the way.
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