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Updated: May 21, 2025
Telephone Induction Coil. Microphone Transformer. Magnetic Modulator. The Telephone Induction Coil. This is a little induction coil that transforms the 6-volt battery current after it has flowed through and been modulated by the microphone transmitter into alternating currents that have a potential of 1,000 volts of more.
How the Apparatus Is Connected Up. Now there are three different ways that the microphone and its modulator can be connected in circuit.
Now there are two methods by which a vacuum tube can be used as a modulator and these are: by the absorption of the energy of the current set up by the oscillator tube, and by varying the direct current that energizes the plate of the oscillator tube.
This is an induction coil that is designed especially for wireless telephone modulation. The Magnetic Modulator. This piece of apparatus is also called a magnetic amplifier. The iron core is formed of very thin plates, or laminations as they are called, and this permits high-frequency oscillations to surge in a coil wound on it.
For this telephone transmitting set you need: one aerial ammeter; one tuning coil; one telephone modulator; one aerial series condenser; one 4 cell dry battery or a 6 volt storage battery; one microphone transmitter; one battery switch; one grid condenser; one grid leak; two 5 watt oscillator tubes with sockets; one blocking condenser; one oscillation choke coil; two filter condensers; one filter reactance coil; an alternating current power transformer, and two 20 watt rectifier vacuum tubes.
Where a single tube is used as an oscillator and a second tube is employed as a modulator, a reactor, which is a coil of wire wound on an iron core, is used in the plate circuit to keep the high voltage direct current of the motor-generator the same at all times. Likewise the grid circuit reactor is used to keep the voltage of the grid at a constant value. Connecting up the Apparatus.
This latter device may be either a telephone induction coil, a microphone transformer, or a magnetic modulator; the first two of these devices step-up the voltage of the battery current and the amplified voltage thus developed is impressed on the oscillations that surge through the closed oscillation circuit or the aerial wire system according to the place where you connect it.
Telephone Induction Coil. Microphone Transformer. Magnetic Modulator. The Telephone Induction Coil. This is a little induction coil that transforms the 6-volt battery current after it has flowed through and been modulated by the microphone transmitter into alternating currents that have a potential of 1,000 volts of more.
The magnetic modulator is described and pictured in this chapter. A 50 to 100 Mile Wireless Telephone Transmitting Set With 110 Volt Alternating Current.
The only difference between this transmitter and the preceding one is that: two 5 watt tubes are used, the first serving as an oscillator and the second as a modulator; an oscillation choke coil is used in the plate circuit; a reactance coil or reactor, is used in the plate circuit; and a reactor is used in the grid circuit. The Oscillation Choke Coil.
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