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What the Heterodyne or Beat Method Is. The word heterodyne was coined from the Greek words heteros which means other, or different, and dyne which means power; in other words it means when used in connection with a wireless receptor that another and different high frequency current is used besides the one that is received from the sending station.
This is the simplest type of heterodyne receptor and it will receive periodic waves from spark telegraph transmitters or continuous waves from an arc or vacuum tube telegraph transmitter. In this type of receptor the detector tube itself is made to set up the heterodyne oscillations which interfere with those that are produced by the incoming waves that are a little out of tune with it.
Whatever tendency the receptor has to howl with this arrangement can be overcome by putting in a grid leak of the right resistance and adjusting the condenser. The Parts and How to Connect Them Up.
In this respect it was like the receptor that had gotten him into trouble. But as he put the small parts together, he felt a certain loneliness. A man Hoddan's age needs to have some girl admire him from time to time. If Nedda had been sitting cross-legged before him, listening raptly while he explained, Hoddan would probably have been perfectly happy. But she wasn't.
Likewise, by varying the capacitance and the inductance of the receptor the circuits can be tuned to receive incoming electric waves of whatever length within the limitation of the apparatus.
It was a receptor unit of an apparently original pattern. It appears to have been a very interesting device." "I'd offered it to the Power Board," said Hoddan, with satisfaction, "and I was thrown out. You had me thrown out! What did it do?" "It substituted for the receptor you smashed," said the attorney.
Where only one vacuum tube is used for producing both frequencies you need only a regenerative, or feed-back receptor; then you can tune the aerial wire system to the incoming waves and tune the closed circuit of the secondary coil so that it will be out of step with the former by 1,000 oscillations per second, more or less, the exact number does not matter in the least.
So I proved what they wouldn't listen to! That receptor saved them ten thousand credits worth of carbon a week! It'll save half a million credits a year in every power station that uses it! If I know the Power Board, they're going right on using it while they arrest me for putting it to work!" The courtroom, in its entirety, visibly shivered. "Aren't they?" demanded Hoddan belligerently.
In music a beat means a regularly recurrent swelling caused by the reinforcement of a sound and this is set up by the interference of sound waves which have slightly different periods of vibration as, for instance, when two tones take place that are not quite in tune with each other. This, then, is the principle of the heterodyne, or beat, receptor.
You can, however, buy all the various parts separately and mount them yourself. If you want the receptor simply for receiving then it is a good scheme to have all of the parts mounted in a box or enclosed case, but if you want it for experimental purposes then the parts should be mounted on a base or a panel so that all of the connections are in sight and accessible.
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