— CalRadio 1 is an open 802.11b-compatible development platform, designed and developed at UCSD with the aim of providing the research community with an open and fully reprogrammable board for experimental purposes. In this work we describe the hardware and software architecture of the board and we provide an accurate analysis of the limiting performance achieved by CalRadio 1 in comparison with commercial 802.11b wireless interfaces. The analysis offers a clear vision of the real potential and limitations of the CalRadio 1 board, pointing out the aspects of major concern for prospective developers.