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You do not require a condenser for a simple receiving set, but if you will connect a fixed condenser across your headphones you will get better results, while a variable condenser connected in the closed circuit of a direct coupled receiving set, that is, one where a double slide tuning coil is used, makes it easy to tune very much more sharply; a variable condenser is absolutely necessary where the circuits are inductively coupled, that is, where a loose coupled tuner is used.
Haney regarded the controls of his drones with a profound calm. Nothing happened, except that they seemed to be falling into a bottomless pit and their stomach-muscles knotted and cramped in purely reflex response to the sensation. Even that grew tedious. The headphones said, "You will enter Earth's shadow in three minutes. Prepare for combat." Joe said drily, "We're to prepare for combat."
This done shunt the potential around the A battery and connect the sliding contact to the or zinc pole of the B battery and the + or carbon pole of this to one terminal of the headphones, while the other terminal of this leads to one of the posts of the second variometer, the other post of which is connected to the plate of the detector tube.
In using either of these heterodyne receivers be sure to carefully adjust the B battery by means of the potentiometer. Wireless Headphones. A telephone receiver for a wireless receiving set is made exactly on the same principle as an ordinary Bell telephone receiver.
They had no tools with which to break back into the satellite. And no help could possibly reach them in less than three weeks. If they couldn't get back inside the Platform, Sanford, laughing proudly, had killed them all. There was a babbling of angry, strained, tense voices in Joe's headphones. Then the Chief roared for silence. It fell, save for Sanford's quiet, hysterical chuckling.
The space tug could take rockets from its cargo and set them outside its hull for firing. No other ship could. Haney and the Chief came back. There was dead silence in the ship, save for a small, tinny voice in Joe's headphones. "We'll pass Earth 600 miles high," said Joe in a flat voice. "Maybe closer. I'm going to try to make it 450.
Where a wire is wound in a coil the impedance of the circuit is increased and where an alternating current is used the impedance grows greater as the frequency gets higher. The impedance of the magnet coils of a receiver is so great for high frequency oscillations that the latter cannot pass through them; in other words, they are choked off. How the Headphones Work.
Another demolition-missile hit the larger section. Still another exploded as that was going to pieces. The smaller fragment ceased to be important. The explosions weren't atomic bombs, of course. They were only demolition-charges. But they demolished the manned rocket admirably. Brown's voice came in the headphones, still tense. "You got it! How about the others?"
When you set up the variometers place them so that their stators are at right angles to each other for otherwise the magnetic lines of force set up by the coils of each one will be mutually inductive and this will make the headphones or loud speaker howl.
A voice in his headphones, from the Platform, said: "That rocket from Earth is still accelerating. Still at three gravities. It looks like it isn't defective. It might be carrying a man. Hadn't you better come in?" The Chief growled: "We won't be any safer there! I want to get the hang of this." Then his voice changed sharply. "Joe! D'you get that?" Joe heard his own voice, very cold. "I didn't.
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