. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 165c—Standby Short Wave Circuits of 107a Tuner. Coils L-3 and L-4 are wound on balls or spheres, mounted on a shaft so they can beturned at a right angle to L-2 and L-S, simultaneously. This is effected by means of the;oupling knob mounted on the right hand end of the tuner, and thus the coupling betweenthe intermediate circuit and the antenna and detector circuits is varied as required. SHORT -WAVECOH06MSER DETECTOR NTtqMEOIATECONOENSeR POTENTIO-M6TER. glLUI ONOENSEf^ AERIALTuN\NCi1N0UCTAHC£ Fig.
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 165c—Standby Short Wave Circuits of 107a Tuner. Coils L-3 and L-4 are wound on balls or spheres, mounted on a shaft so they can beturned at a right angle to L-2 and L-S, simultaneously. This is effected by means of the;oupling knob mounted on the right hand end of the tuner, and thus the coupling betweenthe intermediate circuit and the antenna and detector circuits is varied as required. SHORT -WAVECOH06MSER DETECTOR NTtqMEOIATECONOENSeR POTENTIO-M6TER. glLUI ONOENSEf^ AERIALTuN\NCi1N0UCTAHC£ Fig. 166—Type 107a Tuner (Modified Valve Tuner). Coil L-5 and condenser C-3 constitute the secondary circuit. L-5 is of fixed value andC-3 is the well known billi condenser, having a value of about .0001 is the telephone condenser of approximately .003 microfarad capacity. RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 147 R is a sliding contact potentiometer of 400 ohms, mounted on the left hand side of thetuning box. B is a dry cell battery of to 3 volts, while D is the usual carborundum crystal. The inductance coil, L-7, is an inductive static leak for preventing the accumulation oflarge static charges upon the plates of the short wave variable condenser to prevent therubber dielectric from puncturing. During adjustment of the carborundum crystal, the connection from the battery to thepotentiometer must be reversed until the best response is obtained. The intermediate circuit of either of the foregoing tuners is employ
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
