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The Principles Underlying Radio Communication

The Principles Underlying Radio Communication


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...magnetic fields radiated in transmitting froma vertical wire antenna are shown _in Fig. 159, page 297. Most of the other types of antennas ordinarily used have directional properties, at least to some extent. The inverted L antenna has a con siderable directional effect. An inverted L antenna with a long, low top (Fig. 173-C), such as are often found at large stations, has a marked directional effect, ' as shown by the directional characteristic in Fig. 173-0. The length of the line I" ' drawn from the central point A in any t 0 direction indicates the strength of the ' /' current received from a transmitting sta-' "' tion located in that direction. It will be FIG--I'/'56 noted that the inverted L transmits and 5"'"'l-5 "-RT'cents1-"""-receives best in the direction opposite to %: LN2H'1';AmD" f, ' that in which the antenna top points. The multiple-tuned antenna, as shown in Fig. 173-A, has a considerable directional effect. Ground antennas (see Sec. 150--a) have marked directional characteristics. The most important type of directional antenna is, however, the coil antenna, described in Sections 151-152. Particular kinds of directional effects can be secured by combining different kinds of directional antennas. The directional properties are most often made use of for receiving, but are also used for transmitting. In transmitting, a considerable part of the energy may be concentrated in a particular direction by the use of a direc tional antenna, and the range of a transmitting station thus increased and interference decreased. Directive transmission may also be very helpful to a ship or airplane in aiding it to determine its location. ' I


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Product Details
  • ISBN-13: 9781130579246
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 192
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1130579247
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 354 gr


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