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Updated: May 25, 2025
The following set is inexpensive, and with this cheap, little portable receptor you can get the Morse code from stations a hundred miles distant and messages and music from broadcasting stations if you do not live too far away from them. All you need for this set are: a crystal detector, a tuning coil and an earphone.
The oscillations then flow through the closed circuit where they are rectified by the crystal detector and transformed into sound waves by the telephone receiver as described in connection with Set No. 1. The variable condenser shunted across the closed circuit permits finer secondary tuning to be done than is possible without it.
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.
There are contractors who specialize in this work and have equipment for doing the job quickly with minimum cutting and inconvenience. An electric fire detector in the cellar acts much like a burglar alarm. There are several now on the market. The principle on which they work is thermostatic. Sensitive to increased heat, an alarm bell sounds the moment fire develops.
The way a simple vacuum tube detector receiving set works is like this: when the filament is heated to brilliancy it gives off electrons as previously described.
They've got a detector system set up now that would spot a catassin if it moved twenty feet in any direction." "Life detectors go haywire out of normal space, don't they?" she said. "That's why they surfaced then." Quillan nodded. "You're a well-informed doll. They're pretty certain it's been sucked into space or disposed of by its owner, but they'll go on looking till we dive beyond Garth."
Next connect the ends of the telephone receiver cord to the posts a and b and connect a fixed condenser also with these posts, all of which are shown in the wiring diagram at B, and you are ready to adjust the set for receiving. Receiving Set No. 2. Use the same kind of a detector and pair of head phones as for Set No. 1, but get a loose coupled tuning coil, and a variable condenser.
This kind of a set is called a full wave rectification transmitter. The waves radiated by this transmitter can be received by either a crystal detector or a plain vacuum-tube detector but the heterodyne receptor will give you better results than either of the foregoing types. The Operation of Wireless Telephone Transmitters with Direct Current Short Distance Transmitter.
She shook her head warningly at Bob and motioned toward her husband. "I'd rather hear some music," put in Nancy. "Can't we?" There was an ascending wail from the tuner. "Ain't that a band?" cried Jerry excitedly. "It's an orchestra!" Nancy ejaculated in the same breath. "It's gone!" "We'll get it again," was Bob's confident answer as he twirled the knobs of both tuner and detector.
As these rising and falling currents act on the pulsating currents from the B battery which flow through the detector tube and the headphones you will hear them as beats.
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