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A loud speaker when connected with a wireless receiving set makes it possible for a room, or an auditorium, full of people, or an outdoor crowd, to hear what is being sent out by a distant station instead of being limited to a few persons listening-in with headphones.
This regenerative action of the battery current augments the original oscillations many times and hence produce sounds in the headphones that are many times greater than where the vacuum tube detector alone is used. Operation of Autodyne and Heterodyne Receiving Sets.
This done connect one terminal of the tickler coil which is on the rotor of the variometer to the plate of the detector and the other terminal of the tickler to the other post of the .001 condenser and around this shunt your headphones. A Long Wave Receiving Set.
It's much more important than being admired." "You could take another ship back," she told him. "It would be worth more to Dara than the Med Ship is! And then everybody would realize that you'd planned everything." "Ah!" said Calhoun. "But you've no idea how much this ship matters to Dara!" He seated himself at the controls. He slipped headphones over his ears. He listened.
They got into the space tug. It floated free. "You will fire in ten seconds," said a crisp voice in Joe's headphones. "Ten ... nine ... eight ... seven ... six ... five ... four ... three ... two ... one ... fire!" Joe crooked his index finger. There was an explosive jolt. Rockets flamed terribly in emptiness. The space tug rushed toward the west.
At the same time the alternating positive and negative voltage of the oscillating currents is impressed on the grid; at each change from + to and back again it allows the electrons to strike the plate and then shuts them off; as the electrons form the conducting path between the filament and the plate the larger direct current from the B battery is permitted to flow through the detector tube and the headphones.
At that time most of the people who heard these concerts would have been using headphones and they would not have been very critical about the quality of the sounds they were hearing compared to the magical novelty of snatching voices and music apparently out of thin air. This historic transmitter can be seen in the museum of the Dutch Postal Services in the Hague.
He brought himself to a stop precisely at a hand-hold, grinning triumphantly at the nearly helpless Chief and Haney. Major Holt said in the headphones: "It's worse than that. Radar may have told the country in question that you are on the way up. In that case, if it's even faintly possible to blast the Platform before your arrival with weapons for its defense, they'll blast."
"If you gentlemen will sit at that table over there, and all put on headphones, you can hear your friend's performance exactly as it will sound to everybody else who is listening to this station." "Did you get that?" whispered the irrepressible Herb. "He called us gentlemen." "Shut up," whispered Bob. "He didn't mean you, anyway."
The amplifier tube is a variable relay in that the feeble currents set up by the incoming waves constantly and proportionately vary a large current that flows through the headphones. This then is the principle on which the amplifying tube works. The Operation of a Simple Vacuum Tube Receiving Set.
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