. Practical wireless telegraphy; a complete text book for students of radio communication . ngth switchand the oscillation transformer are discon-nected. Close the D. C. line switch which startsthe motor generator through the automatic starter. Then close the generator field andthe blower motor switch; finally close the A. C. line switch. (6) Tuning. The complete set is now ready for tuning. Disconnect the antenna and tunethe closed oscillatory circuit to the desired wave length by means of a the two-point switch indicator at 300. Adjust the tap leading from the front coil of the
. Practical wireless telegraphy; a complete text book for students of radio communication . ngth switchand the oscillation transformer are discon-nected. Close the D. C. line switch which startsthe motor generator through the automatic starter. Then close the generator field andthe blower motor switch; finally close the A. C. line switch. (6) Tuning. The complete set is now ready for tuning. Disconnect the antenna and tunethe closed oscillatory circuit to the desired wave length by means of a the two-point switch indicator at 300. Adjust the tap leading from the front coil of the oscillation transformer to switch pointmarked 300 to the 300 meter wave length. Then turn the indicator to 600 and adjust thetap to the higher wave length. Next connect the set with the antenna, tune the secondary or open circuit to the closedcircuit and locate taps for each of the two standard wave lengths. The coupling as well as the sliding contact which travels oyer the turns of the aerialtuning inductance, should be varied while locating the wave-length tap, to find the best posi-. Fig. 266—Rear View of the Marconi yi K. Cycle Transmitter. STANDARD MARINE SETS OF AMERICAN MARCONI CO. 247 tion of both the coupling and flexible connection. The circuits are in resonance when theaerial ammeter shows the highest possible reading. With the average ships aerial it is possible to locate the correctnumber of turns at thesecondary winding of the oscillation transformer so that the radiated wave can be changedfrom 600 meters to 300 meters by simply throwing the changeover switch to the proper posi-tion. When this switch is in the 300 meter position, the short wave condenser which is placedin series with the earth lead must have its short-circuiting strap removed. Generally speak-ing, the aerial tuning inductance tap is placed at a fixed point for either the 600 meter or 300meter wave. (c) Adjustment of the Spark Note. Either a receiver or a wavemeter may be used to indi-cate
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
