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34 VT7 0.002 mfd HI RADIO BROADCAST NOVEMBER, 1926 -B FIG. 5 The well known Hartley circuit. The key may be inserted in the minus B lead. In Mr. Mann's set, the inductance consisted of ten turns of No. 14 gauge antenna wire. The condensers must be well insulated since they have to stand the full d. c.. voltage applied to the plate TURNS IN GRID CIRCUIT FIG. 8 I he effect upon antenna and plate currents of varying the filament tap. The greatest ratio of antenna current to plate current is se- cured when there are five turns in the grid circuit £ UJ t 40 0 10 20 30 40 50 60 70 80 90 100 CLOSED CIRCUIT CONDENSER FIG. 6 The closed circuit of the Hartley transmitter at 2 GY tunes from 15,000 to 5260 kc. (20 to 57 me- ters), as this chart shows RAD FIG. 4 A side view of the small 2 GY transmitter. It is operated entirely from dry batteries 15 20 30 35 40 45 50 ANTENNA CONDENSER 60 0 10 20 30 40 50 60 70 80 90 100 Shorted ANTENNA CONDENSER FIG. 9 With the closed circuit adjusted for maximum efficiency, the antenna tunes according to this curve. This is a typical resonance curve. The wavelength is approximately 38.8 meters FIG. 7 As the antenna series condenser is varied, the transmitter tunes as this chart shows. It also gives an idea of how the particular antenna tunes to dif- ferent wavelengths. On the longer waves, the antenna is appar- ently of lower resis- tance since more cur- rent can be fed into it PLATE VOLT5 ; FIG. 10 The relation between power input and antenna current is shown here. The greater the plate voltage the greater the antenna current and naturally the plate current increases toe