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Updated: May 29, 2025
Where radio frequency or audio frequency amplifiers are used to couple your amplifier tubes in cascade you must take particular pains to shield them from one another in order to prevent the feed back of the currents through them, which makes the head phones or loud speaker howl.
A glance located the detector mechanism, a set of short-wave coils and amplifiers, and a brief study made plain to him the principles underlying the directional loop finders and the controls which guided the flying shell along the path of the tracer ray.
"Even with good microphones and amplifiers the engineer in the field may often experience difficulties with the lines connecting the outside point to the studio. The majority of such lines do not transmit the higher frequencies adequately, especially the longer ones. The problems become immense when European simultaneous broadcasts are attempted.
Patrolman Willis worked painstakingly with amplifiers on what oddments could be picked up in space. "It's Four, sir," he reported unnecessarily, because the sergeant had watched as he worked. "They've got detectors out. I could just barely pick up the pulses. But by the time they've been reflected back they'll be away below thermal noise-volume. I don't think even multiples could pick 'em out.
This coil is placed over the upper end of the magnet and its terminals are connected to the secondary of the induction coil. Now when the coil is energized by the current from the amplifiers it and the core act like a solenoid in that the coil tends to suck the core into it; but since the core is fixed and the coil is movable the core draws the coil down instead.
You'd pick up the 'phone and give your message. That sound would go in the form of a tiny electrical impulse into one of the great sending stations on the Atlantic Coast, we'll say, and there it would be caught up by a powerful lot of electrical machines, amplifiers, alternators, and others, that would keep making it stronger and stronger until finally it was flung out into space from the ends of the great wires or antennae.
"It's mostly a job of adapting the sonarphone arrangement from our Fat Man suits in miniature." A tiny mike, Tom explained, would be installed on the inside of each face mask, with its output feeding to a sonar transducer on the exterior. The receiving transducers would feed from amplifiers to earphones.
This coil is placed over the upper end of the magnet and its terminals are connected to the secondary of the induction coil. Now when the coil is energized by the current from the amplifiers it and the core act like a solenoid in that the coil tends to suck the core into it; but since the core is fixed and the coil is movable the core draws the coil down instead.
Over the heads of the crowds, at intervals, floated small contragravity lifters on which were mounted the amplifiers that were bellowing: "SPACE VI-KING GO HOME! SPACE VI-KING GO HOME!" The police stood motionless, at parade rest; the mob surged closer.
The amplifiers consisted of iron core transformers comprising several stages of radio frequency. The variometers were wound of 22-gauge wire. Loose couplers were used instead of the ordinary tuning coil. The switch arms, pivoting shafts and attachments for same, the contact points and binding posts were home-made.
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