. A system of multiplex telephony by the use of vacuum tubes . K^4. 37 Four circuits, as shown in , were now con-nected to the line in order to build up a three-circuit multiplex system. The general arrangementwas as shown in fi,?. 21. In two of these circuits80 turn coils were used mth full condenser capacity,in the other two, 40 turn coils with the condensersset at their lowest reading*. This gave th6 maximumdifference in freauency between the two completecircuits. The set of lower frequency was firstad;^usted and tuned for the best transmission andreception of speech. Then the set o
. A system of multiplex telephony by the use of vacuum tubes . K^4. 37 Four circuits, as shown in , were now con-nected to the line in order to build up a three-circuit multiplex system. The general arrangementwas as shown in fi,?. 21. In two of these circuits80 turn coils were used mth full condenser capacity,in the other two, 40 turn coils with the condensersset at their lowest reading*. This gave th6 maximumdifference in freauency between the two completecircuits. The set of lower frequency was firstad;^usted and tuned for the best transmission andreception of speech. Then the set of hi.^-her frequencywas adjusted for best results. The two completeoscillating- sets were then closed doiw. on the linetogether. The first effect was to unbalance the set-ting so that distortion was very pronounced inboth, and also to bring in beat tones which were notpresent before in the separate sets. It was found that the circuits had become verysensitive to condenser adjustment, a slight changebrought in beat tones from the lowest to the highestpitch. Permit
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Keywords: ., bookcentury1900, bookdecade1910, bookidsystemofmult, bookyear1919
