. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 16Sa—Standby Long Wave Adjustment of Marconi Type 107a Tuner. cerusite. When the latter detector is employed, the potentiometer is out of thecircuit. Observance next should be made of the binding posts from which wiresare connected to the receiver circuits and to the contacts of an aerial change-overswitch. The latter, when open, protect the detector and head telephones from theinduced potentials of the local transmitter. ^ l-s. = =^ C-3C-4 ii^ P B Fig. 165b—Tune Circuits of Type 107a Tuner. In
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 16Sa—Standby Long Wave Adjustment of Marconi Type 107a Tuner. cerusite. When the latter detector is employed, the potentiometer is out of thecircuit. Observance next should be made of the binding posts from which wiresare connected to the receiver circuits and to the contacts of an aerial change-overswitch. The latter, when open, protect the detector and head telephones from theinduced potentials of the local transmitter. ^ l-s. = =^ C-3C-4 ii^ P B Fig. 165b—Tune Circuits of Type 107a Tuner. In the diagram. Fig. 165-b, L-1 is the aerial tuning inductance, the value of which isaltered by means of a multi-point switch mounted on the left hand front of the tuner. C-1 is the short wave variable condenser connected in series with the aerial system. Inthe full scale position it short circuits itself and is thus cut out of the antenna circuit. Thiscondenser is mounted on the left hand side on the top of the tuner. L-2 is the primary winding of the receiving tuner and has a fixed value of inductance(not variable). 146 PRACTICAL WIRELESS TELEGRAPHY. Coil L-3, condenser C-2, coil L-4 comprise the intermediate circuit. L-3 is of fixed valueand is in inductive relation to L-2. L-4 has the same dimensions as L-3, but it is in in-ductive relation to coil L-5. The wave length of this circuit is varied by means of a condenser C-2.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
