Excerpt from A Portable Radio Direction Finder for 90 to 7, 700 Kilocycles The receiving set used in this direction finder is a superheterodyne which employs a standard Signal Corps amplifier. The tuning con trols have been reduced to a single one by mounting the main tuning condenser and the heterodyne generator tuning condenser on the same shaft. The shaft also carries a cam which operates an auxiliary variable condenser which maintains a constant frequency difference kc m) between the heterodyne frequency and the incoming frequency. The receiving set is shown in Figures 4 and 5. Figure 6 gives the circuit diagram, and Figure 7 gives it in simplified form. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.