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Updated: May 17, 2025
If what this pirate says is true, we can resuscitate them, and they'll be better off for the experience!" The doctor shook his head. "I've been examining your passengers. I'm afraid that you'll never be able to bring these people back to life again, sir. I can't detect any heart action even with the amplifier. Ordinary heart action sounds like a cataract through this instrument.
Theoretically, sound-waves also extend to an infinite distance, but I don't believe that any possible detector and amplifier could reconstruct a voice more than an hour or so after it had spoken. It might, though we'll have to try it some time, and see. You're fairly good at lip-reading, as I remember it. Get as much of it as you can, will you?"
Where either a radio frequency transformer, that is one without the iron core, or an audio frequency transformer, that is one with the iron core, is used to couple the amplifier tube circuits together better results are obtained than where a high resistance grid leak is used, but the amplifying tubes have to be more carefully shielded from each other or they will react and set up a howling noise in the head phones.
In this way then are the faint incoming signals, speech and music which are received by the amplifying receiving set reproduced and magnified enormously. The Telemegafone is shown complete at B. From the foregoing chapters you have seen that the vacuum tube can be used either as a detector or an amplifier or as a generator of electric oscillations, as in the case of the heterodyne receiving set.
Night was at hand when the two reached Charley's camp. Nothing had been disturbed. Charley took advantage of the remaining daylight to couple up the battery and the amplifier to his wireless. He tested the outfit and found he had a strong spark that cracked like a whip when he touched the key. "Look at that!" he cried. "Now I feel better. I can always get into communication with somebody now."
I brought these along, however, and thought we'd go back and get the battery, for I'm sure that's what it is." He paused and handed to Charley two pasteboard boxes he had strapped to his back. The larger one was bulky, but weighed comparatively little. The other was small. "I wonder what it is," said Charley, as he untied the string and opened the smaller box. "The amplifier," he said.
On the other hand grid leaks cost less but they are more troublesome to use as you have to find out for yourself the exact resistance value they must have and this you can do only by testing them out. A Grid Leak Amplifier Receiving Set. With Crystal Detector.
With this six step amplifier set and loop aerial you can receive wave lengths of 150 to 600 meters from various high power stations which are at considerable distances away. Efficient Regenerative Receiving Set. How to Prevent Howling.
When listening-in to distant stations the energy of the received wireless waves is often so very feeble that in order to hear distinctly an amplifier must be used.
For instance," and he pointed to a boxed device, "that thing is an infra-low frequency amplifier. Now, I haven't much more than a faint glimmer of what the thing is and how it differs from a standard amplifier, but I know that it must be built precisely thus-and-so, and finally it must be fitted into the machine per instructions. Look, Mrs. Bagley."
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