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Updated: May 25, 2025
Thus the high frequency currents which the steel magnet cores of the telephone receiver would choke off are changed by the detector into intermittent direct currents which can flow through the magnet coils of the telephone receiver.
It was the 1939 edition and I found a circuit for a receiver which looked simple enough for me to try. It was described as a regenerative detector and audio amplifier. One was the Electron run by George Spanos, who was the agent for the Dutch Philips company.
This done connect the or negative electrode of the A battery with the second post of the variable condenser and connect the + or positive electrode with the free post of the first rheostat, the other post of which connects with the free terminal of the filament of the detector.
"Si," said his father, in horrified tones, "I hope you hain't bin passin' none o' the Cincinnati Confederate money on these people." "I hope not, Pap. But then, you know, I ain't no bank-note detector. I can't tell the Cincinnati kind from the Richmond kind, and I never try very hard. All Confedrt money's alike to me, and I guess in the end it'll be to them.
As he did so, a hint of pale pink light caught the corner of his eye. He backed away from the instrument and turned his head quickly, looking at the colorimeter-type radiation detector at the side of his helmet. It was glowing. An icy chill sent a shiver through him. Great, gorgeous galaxies! He had forgotten ... had Koa and the others?
Thermo-piles are interesting from a scientific point of view as a direct means of transforming heat into electricity. A sensitive pile is also a delicate detector of heat by virtue of the current set up, which can be measured with a galvanometer or current meter.
From this you will see that any regenerative set can be used for autodyne, or self-heterodyne, reception. The Separate Heterodyne Receiving Set. The better way, however, is to use a separate vacuum tube for setting up the heterodyne oscillations. The latter then act on the oscillations that are produced by the incoming waves and which energize the grid of the detector tube.
Where audio frequency transformers are used for stepping up the voltage of the current of the detector and amplifier tubes, the radio frequency current does not get into the plate circuit of the detector at all for the reason that the iron core of the transformer chokes them off, hence, the succeeding amplifiers operate at audio frequencies. A Six Step Amplifier Receiving Set With a Loop Aerial.
Their idea was to build a radiation-detection instrument in an empty wing tank and hang the tank on an F-47. Then when a UFO was reported they would fly a search pattern in the area and try to establish whether or not a certain sector of the sky was more radioactive than other sectors. Also, they proposed to build a highly directional detector for the F- 47 and attempt actually to track a UFO.
As the number of electrons that are thrown off by the filament is not great and the voltage of the plate is not high the current that flows between the filament and the plate is always quite small. How the Two Electrode Tube Acts as a Detector. The two electrode vacuum tube was first made by Mr.
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