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Updated: June 1, 2025
A 50 to 100 Mile Wireless Telephone Transmitter With Direct Current Motor Generator. As the initial source of current available is taken to be a 110 or 220 volt direct current a motor-generator having an output of 350 volts must be used as before.
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.
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.
From the current distributor the current was conducted through other oil switches to the transformers entering at 100,000 volts and emerging at 2,300 volts. Then the current was conducted from the transformers through switches to the motor-generator sets and became the power employed to operate them.
The principal pieces of apparatus for this transmitter are the same as those used for the 100 Mile Continuous Wave Telegraph Transmitting Set described and pictured in the preceding chapter which used direct current, except that an alternating current power transformer is employed instead of the more costly motor-generator. The Apparatus Required. The Choke Coils. The Milli-ammeter.
For this transmitter you require: one oscillation transformer; one hot-wire ammeter; one aerial series condenser; one grid leak resistance; one chopper; one key circuit choke coil; one 5 watt vacuum tube oscillator; one 6 volt storage battery; one battery rheostat; one battery voltmeter; one blocking condenser; one power circuit choke coil, and one motor-generator. The Oscillation Transformer.
A 50 to 100 Mile Wireless Telephone Transmitter With Direct Current Motor Generator. As the initial source of current available is taken to be a 110 or 220 volt direct current a motor-generator having an output of 350 volts must be used as before.
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