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Radio Communication Pamphlet Volume 40

Radio Communication Pamphlet Volume 40


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ... as the frequency rises, and becomes very considerable at the higher frequencies, such as occur in radio work. The behavior of the condenser is just the reverse. At the lowest frequency it offers a very large reactance, but at radio frequencies the impedance is vastly smaller. For very high frequencies the reactance would be negligible. In most radio circuits the resistance of the circuit can be kept as small as a few ohms. It is therefore obvious that only in the case of the 100,000 cycles, in the table, would it be necessary to take account of the resistance in calculating the impedance. For example, if R=5 ohms, the impedance for the frequencies in the table above, will have the values 530,000, 31,837, 6.5, 5 and 3110, respectively. In all except the third and fourth cases, the difference between the reactance and the impedance is less than one part in a million of the total. It is thus apparent that in many cases the impedance of a circuit depends almost entirely on the reactance of the circuit. Only in those cases where the reactance is small is it necessary to take the resistance into account. 109. Series Resonance.--It would seem at first sight, then, that radio circuits would offer for the most part a high impedance and that therefore very little current could flow, except with very large emf. This is in general true of any radio circuit if the frequency be taken at random. However, by properly adjusting the value of the frequency, the reactance of the circuit may be made zero. This is at once evident, when we remember that the inductive reactance increases with the frequency, while the capacitive reactance diminishes. At some definite frequency, then, the inductive reactance of the coil must have the same value as the capacitive reactance of the co...


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Product Details
  • ISBN-13: 9781236120793
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1236120795
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr


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