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Updated: May 17, 2025
While two of the others hurried out another door for weapons and a third bolted the door through which the two men had just come, Placer picked up a microphone and switched on the amplifier system that covered every area of all levels of the Canfell Hydroponic Farm.
The Search for the Wireless Telephone Early Successes Carty and His Assistants Seek the Wireless Telephone The Task Before Them De Forest's Amplifier Experimental Success Achieved The Test Honolulu and Paris Hear Arlington The Future. No sooner had Marconi placed the wireless telegraph at the service of the world than men of science of all nations began the search for the wireless telephone.
To use the amplified radio frequency oscillating currents or amplified audio frequency alternating currents that are set up by an amplifier tube either a high resistance, called a grid leak, or an amplifying transformer, with or without an iron core, must be connected with the plate circuit of the first amplifier tube and the grid circuit of the next amplifier tube or detector tube, or with the wire point of a crystal detector.
The gas filled tube, however, can be used as an amplifier and either kind of tube can be used for either radio frequency or audio frequency amplification, though with the exhausted tube it is easier to obtain the right plate and filament voltages for good working. The Fixed Resistance Unit, or Grid Leak. Grid leaks are made in different ways but all of them have an enormously high resistance.
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.
World's Largest Loud Speaker ever made. Either kind may be used with a one- or two-step amplifier or with a cascade of half a dozen amplifiers, according to the degree of loudness desired. The Telemegafone itself is not an amplifier in the true sense inasmuch as it contains no elements which will locally increase the incoming current.
Nadia tore herself from Stevens' embrace, to see upon the lambent screen the happily smiling faces of her mother and sister. "Mother! Claire! Oh, you three wonder-workers!" She addressed simultaneously the distant Terrestrials and the scientists at her side, while broken exclamations, punctuated by ominous, crackling snaps, came from the laboring amplifier.
Think what it will mean if you have your work on your transmitting camera waiting for you months and years of hard and honest work work that you love, work that will lead to bigger things, and give you the time, yes, and the money, you need to perfect your amplifier. But outside of that, even to have your work surely that's enough!"
Where either a radio frequency transformer, that is one without the iron core, or an audio frequency transformer, that is one with the iron core, is used to couple the amplifier tube circuits together better results are obtained than where a high resistance grid leak is used, but the amplifying tubes have to be more carefully shielded from each other or they will react and set up a howling noise in the head phones.
To use a loud speaker you should have a vacuum tube detector receiving set and this must be provided with a one-step amplifier at least. To get really good results you need a two-step amplifier and then energize the plate of the second vacuum tube amplifier with a 100 volt B battery; or if you have a three-step amplifier then use the high voltage on the plate of the third amplifier tube.
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