Article Title

Reconstructing the Radio


Electrical and Electronics

Publication Date


Document Type





The goal of the research presented in this paper is to examine the techniques used for the construction of early radios, specifically crystal radios. The paper begins with a brief summary of the history that led to the transition from wired to wireless communication. Next, the paper examines the components used in building a crystal radio including basic antenna design and the resonant circuit, and it also takes a close look at the point-contact rectifier, which was a catalyst in the use of radio waves for communications and allowed for even the most inexperienced person to construct their own home radio system. The paper includes a detailed description of the construction of the crystal radio including the winding of a custom-made inductor and shows the construction of a point contact for a galena crystal to act as an AC rectifier.