. Practical wireless telegraphy; a complete text book for students of radio communication . tator androtor windings of the usual alternator, a number of external inductance coilsand condensers are connected in both the shunt and rotor circuits, which areemployed for tuning these circuits to several frequencies. In fact, by correctlyproportioning the inductance and capacity, current at a frequency of 60,000cycles per second can be taken from the field winding, and if made to flow in aproperly tuned antenna circuit will radiate waves, 5,000 meters in length. In the diagram, Fig. 283, the field w
. Practical wireless telegraphy; a complete text book for students of radio communication . tator androtor windings of the usual alternator, a number of external inductance coilsand condensers are connected in both the shunt and rotor circuits, which areemployed for tuning these circuits to several frequencies. In fact, by correctlyproportioning the inductance and capacity, current at a frequency of 60,000cycles per second can be taken from the field winding, and if made to flow in aproperly tuned antenna circuit will radiate waves, 5,000 meters in length. In the diagram, Fig. 283, the field windings of the alternator are represented at F (gen-erally referred to as the stator) and the armature winding at A known as the rotor, Thearmature inductance A and the condenser C-4 are shunted by the inductance L-3 and thecondenser C-5. Similarly, L-3 and C-4 are shunted by condenser C-3. The values of C-4,L-3, C-5 and A are so chosen that either C-4 and A, or C-S and L-3 are in resonance to theinitial frequency of the generator, that is to say, C-4 and A or C-S and L-3 have identical. \/W\W/ ^w Fig. 283—Complete Circuit of the Goldschmidt Alternator. TRANSMITTERS OF UNDAMPED OSCILLATIONS. 271 time periods and since they are connected in parallel, the period of the circuit remainsunchanged and in resonance with the initial frequency of the alternator. The function ofinductance L-3 and condenser C-4 is to place the armature on short-circuit at a givenfrequency. In fact, it would not be possible to completely short-circuit the rotor windingfor radio-frequent currents by merely placing a short piece of wire across the , by placing another circuit containing inductance and capacity of identical timeperiod in shunt to the rotor, a complete short-circuit is effected. Thecircuit of the stator F, C-1, L-2 and C-2, are similar to those of the rotor A, but thiscircuit is tuned to twice the fundamental frequency of the alternator. Also, the distributedcapacity of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
