. Practical wireless telegraphy; a complete text book for students of radio communication . AUTOMATIC ^ 110VOLT. TYPE T WITHDYNANAIC BRAKE. Fig 255 Fundamental Wiring Diagram of the Automatic Starter Furnished the Marconi J^ K. W 500 Cycle Transmitter. (See Fig. 74 and Section J in Appendix) of the generator is approximately 350 volts and the load voltage about 120 volts. Thenormal speed of the machine is 2,500 R. P. M. The voltage at the armature terminals canbe varied by the field rheostat mounted on the right hand side of the panel. The low powercircuits are
. Practical wireless telegraphy; a complete text book for students of radio communication . AUTOMATIC ^ 110VOLT. TYPE T WITHDYNANAIC BRAKE. Fig 255 Fundamental Wiring Diagram of the Automatic Starter Furnished the Marconi J^ K. W 500 Cycle Transmitter. (See Fig. 74 and Section J in Appendix) of the generator is approximately 350 volts and the load voltage about 120 volts. Thenormal speed of the machine is 2,500 R. P. M. The voltage at the armature terminals canbe varied by the field rheostat mounted on the right hand side of the panel. The low powercircuits are protected by the usual set of protective condensers. A closed core transformer having a secondary potential of 14,500 voHs is supplied and isfitted with an appropriate safety gap. 236 PRACTICAL WIRELESS QUENCHED GROUND CONNEaiON HELD IN PLACE UNDER FLAN6E NUT - Fig. 256—Radio Frequency Circuits of the J4 K. W. 500 Cycle Transmitter. The circuits of radio-frequency (Fig. 256) are similar to the 2 K. W. set with the excep-tion that a condenser of fixed capacity is employed throughout all wave lengths. Also thesecondary winding is moved away from the primary for change of coupling, which is thereverse of the method employed in the 2 K. W. set. However, the change of wave-length isaccomplished in the same manner by a special switch and the primary and secondary wind-ings remain in a fixed mechanical position for all wave-lengths. The transmitter condenser consists of 4 copper-plated small Leyden jars connected inparallel having capacity of .001 mfds. each. These are mounted in a metal rack behind thepanel. This set is also fitted with a single pole double throw high potential switch which eitherconnects the aerial to the transmitter or connects it directly to earth for protection again
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
