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Updated: May 4, 2025
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.
It was an "oscillator", a new system for the employment of sound for submarine signalling, using water instead of air as a medium to transmit sound waves. It was composed of a ring magnet, a copper tube lying in an air-gap in a magnetic field and a stationary central armature. The tube was attached to a steel diaphragm.
To produce the oscillations he employed the oscillator designed by Augusto Righi. Depressing the key closed the circuit and brought the inductor coil into action.
You will observe: that the terminals of the power transformer secondary coil which develops 10 volts are connected to the filaments of the oscillator tubes; that the terminals of the other secondary coil which develops 10 volts are connected with the filaments of the rectifier tubes; that the terminals of the third secondary coil which develops 550 volts are connected with the plates of the rectifier tubes; that the pair of filter condensers are connected in parallel and these are connected to the mid-taps of the two filament secondary coils; that the reactance coil and the third filter condenser are connected together in series and these are shunted across the filter condensers, which are in parallel; and, finally, a lead connects the mid-tap of the 550-volt secondary coil of the power transformer with the connection between the reactor and the third filter condenser.
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.
You can, however, use 110 volt direct current from a lighting circuit as your initial source of power to energize the plate of the vacuum tube oscillator of your experimental transmitter. Where you have a 110 volt direct current lighting service in your home and you want a higher voltage for your plate, you will then have to use a motor-generator set and this costs money.
Rick held it to his own heart for a few minutes, then tapped on the bell with his forefinger. "Looks good on the display," Dick's voice came back. "What did you hit it with a hammer?" "Finger," Rick said. "Let's take a temperature next." He found the thermocouple that would be attached to the marmoset's body, traced the circuit to the oscillator, then called, "Watch my own body heat."
Further, a single 50 watt oscillator tube will send to distances of 50 to 100 miles while two of these tubes in parallel will send from 100 to 200 miles. Finally, where four or five oscillator tubes are connected in parallel proportionately greater distances can be covered. A Short Distance Wireless Telephone Transmitting Set-With 110 Volt Direct Lighting Current.
The choke coil is wound up of about 250 turns of No. 30 Brown and Sharpe gauge cotton covered magnet wire on a spool which has a diameter of 2 inches and a length of 3-1/4 inches. The 5 Watt Oscillator Vacuum Tube.
The voltage of the grid of the modulator tube is varied by the secondary coil of the induction coil or microphone transformer, above described. In this way the modulator tube acts like a variable resistance but it amplifies the variations impressed on the oscillations set up by the oscillator tube.
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