Radio Volume 4

Radio Volume 4

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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. 1922 edition. Excerpt: ...connected in the-grid circuit is called a "C" battery or "bias" battery. Since it supplies little or no current it may consist of the smallest size of flashlight cells. If more amplification is required than that given by one tube, the telephones of Fig. 3 may be taken out and the primary of another transformer connected in their place. The secondary of this transformer is connected to the grid and filament of another tube, which will amplify the results of the first tube. This action may be continued through four or five tubes in succession, and is known as cascade amplification. Very careful design is necessary in such multi-stage amplifiers in order to prevent distortion. The matter of "howling" in amplifier circuits can be entirely avoided. This subject will be taken up in the next article of this series, which will deal with the vacuum tube as an oscillator. SWEDEN AND FINLAND TO GET RADIOPHONE BOND A radio telephone system to take the place of the contemplated telephone cable between Sweden and Finland now is being investigated by officials of the two governments involved. Estimates place the cost of the cable from 20,000,000 to 40,000,000 marks and the radio station at 10,000,000 marks. HIGH-FREQUENCY RESIST-ANCE OF INDUCTANCE COILS An "inductance coil" is simply a coil of wire wound in any one of a number of different familiar forms. The behavior of such coils in circuits carrying direct current or alternating cur rents of low frequencies, such as 60 cycles, has been studied for many years and is well known. When the attempt is made to predict the behavior of an inductance coil at radio frequencies by extending the relations which are sufficient to predict its behavior at low frequencies, it more

Product details

  • Paperback | 534 pages
  • 189 x 246 x 27mm | 943g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509390
  • 9781236509390