441. a long wave autodyne

大家新年好啊

441. a long wave autodyne<br /><br />In the heterodyne, or beat method, separate sustained oscillations, Juicy Couture that are just about as strong as those of the incoming waves, are set up in the receiving circuits and their frequency is just a little higher or a little lower than those that are set up by the waves received from the distant transmitter. The result is that these oscillations of different frequencies interfere and reinforce each other when beats are produced, the period of which is slow enough to be heard Juicy Couture Handbags in the headphones, hence the incoming signals can be heard only when waves from the sending station are being received. A fuller explanation of how this is done will be found in Chapter XV. The Autodyne or Self-Heterodyne Long-Wave Receiving Set.--This Juicy Couture Laptop is the simplest type of heterodyne receptor and it will receive Juicy Couture Sale periodic waves from spark telegraph transmitters or continuous waves from an are 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. With a long wave autodyne, or self-heterodyne receptor, as this type is called, and a two-step audio-frequency amplifier you can clearly hear many of the cableless stations of Europe and others that send out long waves. For receiving long wave stations, however, you must have a long aerial--a single wire 200 or more feet in length will do--and the higher it is the louder will be the signals. Where it is not possible to put the aerial up a hundred feet or more above the ground, you can use a lower one and still get messages in International Morse fairly strong.