Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 116
st entirely upon thecharacteristics of the tubes used and the wave-length ranges RECEIVING EQUIPMENT 91 to be covered. They contain a comparatively few turns ofwire wound on special iron cores. The iron used in thesecores is rolled very much thinner than that used in audio-frequency transformers… … dmfe. 20-I00volt:s. Fig. 45.—Three-stage radio-frequency amplifier with resistance cou-pling connected to loop antenna. type requires more turns than the iron-cored type but issimpler to construct. Resistance coupling is sometimes employed for shortwave lengths, and while not nearly so efficient as…
Radio
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