. Practical wireless telegraphy; a complete text book for students of radio communication . -2 aswill give the correct degree of coupling at all wave lengths. The protective leak inductanceR prevents the accumulation of heavy charges in the condenser C-1. The coupling be-tween L-2 and L-3, and L-S and L-4, is varied simultaneously by a single knob on the sideof the box. A protective gap R protects the primary circuit of the tuner should by accidentthe circuits come in contact with the high voltage wires of the transmitter. Because of the small secondary winding, this tuner is not suitable in t
. Practical wireless telegraphy; a complete text book for students of radio communication . -2 aswill give the correct degree of coupling at all wave lengths. The protective leak inductanceR prevents the accumulation of heavy charges in the condenser C-1. The coupling be-tween L-2 and L-3, and L-S and L-4, is varied simultaneously by a single knob on the sideof the box. A protective gap R protects the primary circuit of the tuner should by accidentthe circuits come in contact with the high voltage wires of the transmitter. Because of the small secondary winding, this tuner is not suitable in the tune position RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 151 for a crystal detector, but will give some response on the standby side in which connec-tion the crystal is connected in series with the aerial. It has frequently been observed that the magnetic detector gives better response to SCOcycle transmitters when the iron band revolves at a speed about twice that used in receivingfrom 60 cycle transmitters. Normally the band travels at a very low speed—a few feet Fig. 170—Type 106 Receiving Tuner (American Marconi Company). 138. The Marconi Type 106 Receiving Tuner. (American Marconi Com-pany).—A receiving set of particular excellence combining mechanical andelectrical features of merit is the type 106 tuner of the American Marconi Com-pany. This set is of the panel type, the necessary controlling switches beingmounted on the front of the board as shown in photograph 170, the coupler,variable condensers, potentiometer, etc., being mounted on the rear as in photo-graph 171. The coupling between the primary and secondary windings is variedby means of a special rack and pinion adjustment which is in turn controlled bya knob on the front of the panel with a scale marked from zero to 10 (markedcoupling). The inductance of the primary winding is changed by means of two multi-point sivitches, one of which operating in conjunction with a barrel switch disco
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
