Radio Communication Pamplet Volume 9; V. 17; V. 22; V. 25-28

Radio Communication Pamplet Volume 9; V. 17; V. 22; V. 25-28

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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: used for making fine tuning adjustments. This knob may be meshed with the gears at will by pushing it in toward the panel, and released by pulling it out. When the gears are meshed, there is sufficient friction so that the variometer is practically locked in position but may be moved easily by means of the small knob. The antenna variometer and wave-length variometers are located at opposite ends of the box in order to obtain minimum reaction between the two circuits, due to their mutual induction. The Transmit-Receive switch is located in the center of the panel. It is thrown to the right to transmit, and to the left to receive. The filament circuits are open when the Transmit-Receive switch is open. The receiving condensers are located in the central portion of the panel (D' and E', fig. 1). Both primary and secondary condensers are provided with slow-motion knobs (F' and G', fig. 1). The antenna-coil switch (H', fig. 1) for changing taps is located directly above the primary antenna circuit condenser. It is a twoposition dial switch and the positions are marked " Short wave " and "Long wave." The coil has sufficient inductance when the switch is in the long-wave position to tune to 1,100 meters on a smaller antenna than the one usually supplied. The tickler-coil switch is located directly above the secondary condenser (I', fig. 1). "When the switch is in the position marked " SP," the tickler coil is shorted. The receiving-tubes filament rheostat (L, fig. 1) is provided for compensating for the drop in the filament battery voltage as the batteries become exhausted. It is also useful in regulating the filament current of VT-5 tubes for the best reception. It is only in the circuit when a separate receiving...
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Product details

  • Paperback | 78 pages
  • 189 x 246 x 4mm | 154g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236558197
  • 9781236558190