. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 152—The Capacitively Coupled Receiver,damentally the operation of this apparatus 134 PRACTICAL WIRELESS TELEGRAPHY. of coupling is that any change of wave-length adjustment of the open and closed circuitschanges the coupling, but this can be prevented by connecting an aerial tuning inductancein series with the primary winding. The primary and secondary windings may be looselycoupled at any particular wave length adjustment, by adding turns at the aerial tuninginductance and taking them out at the p
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 152—The Capacitively Coupled Receiver,damentally the operation of this apparatus 134 PRACTICAL WIRELESS TELEGRAPHY. of coupling is that any change of wave-length adjustment of the open and closed circuitschanges the coupling, but this can be prevented by connecting an aerial tuning inductancein series with the primary winding. The primary and secondary windings may be looselycoupled at any particular wave length adjustment, by adding turns at the aerial tuninginductance and taking them out at the primary winding. This will decrease the mutualinductance of the two circuits and therefore will reduce the coupling. The method termed the capacitive coupling is shown in the diagram of Fig. 152. Theprimary and secondary coils shown at L-1 and 1^2 are not in direct inductive Fig. 153a, b, c—Complete Circuit for the Carborundum Rectifier and Receiving Tuner. They are said to be electrostatically coupled through the condensers C-1 and C-2. Inpractice, the condensers C-1 and C-2 are mounted on a single shaft and their capacityvaried simultaneously by a single control knob. It is claimed that since a fixed potentialexists across coil L-1 the energy transferred to the secondary circuit varies as the capacityof condensers C-1 and C-2. Now the greater the coupling the greater will be the transferof energy from the antenna to the detector circuit and hence the coupling* between the •The author has had practically no experience with the capacitive receiver and therefore cannot speakauthoritatively on the working of this circuit. RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 135 circuits varies as the capacity of the coupling condensers. It is claimed this circuitpossesses the advantage that a fixed degree of coupling between the primary andsecondary winding
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
