. Practical wireless telegraphy; a complete text book for students of radio communication . BATTERV Hllllllh Fig. 171—Rear View Type 106 Receiving Tuner. capacity effect between the opposite plates (of the variable condenser) in the so-called zero position of capacity. A special wire wound potentiometer is supplied, having a resistance of about 450 ohms, the value of which is adjusted by a rotary multipoint switch. The receiving de- tector, placed in a ver-tical position to thefront of the panel,consists of a contactpoint with springpressure mounted ona universal jointwhich may be placedin con
. Practical wireless telegraphy; a complete text book for students of radio communication . BATTERV Hllllllh Fig. 171—Rear View Type 106 Receiving Tuner. capacity effect between the opposite plates (of the variable condenser) in the so-called zero position of capacity. A special wire wound potentiometer is supplied, having a resistance of about 450 ohms, the value of which is adjusted by a rotary multipoint switch. The receiving de- tector, placed in a ver-tical position to thefront of the panel,consists of a contactpoint with springpressure mounted ona universal jointwhich may be placedin contact with thesensitive spot on oneof several crystalsmounted in a cup di-rectly underneath. A fundamental dia-gram of the type 106tuner is shown in , which, as will beobserved, is somewhatsimilar to the connec-tions of Fig. part of this dia-gram to be given par-ticular attention is theconnection of the. POTENTIOMETER -aAA/WVWWV^ PHONES Wtector SHORT WAVE VARIABLE M. J _ BUZZER TESTER Fig. 172—Fundamental Circuit Diagram 106 Tuner. RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 153 potentiometer, the head telephones and the fixed condenser C-3, and the group-ing of the primary and secondary turns. The buzzer excitation system shownwill be described in detail in paragraph 149. The reader should note that the 106 tuner is constructed so that only the used turns ofthe primary and secondary windings are in direct inductive relation, that is, the unusedturns of either winding do not overlap and consequently when the primary and secondaryare set at low values of inductance, care must be taken to have these two windings in thecorrect inductive relation. For instance, by a little consideration, it will be evident that ifthe secondary winding is placed too far inside the primary coil the coupling is decreased justas it is when the secondary winding is drawn out of the coil. The general ins
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
