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Updated: May 12, 2025
The operation of key circuits of the latter kind will be described presently. The Operation of C. W. Telegraph Transmitters with Alternating Current With a Single Oscillator Tube. Where an oscillator tube telegraph transmitter is operated by a 110 volt alternating current as the initial source of energy, a buzzer, chopper or other interruptor is not needed in the key circuit.
If both transmitters be closed simultaneously, both batteries will be placed to the line, which would practically result in doubling the current in each of the main-line coils, in consequence of which both relays are energized and their armatures attracted through the operation of the keys at the distant ends.
The fact that metallic electrodes can practically be employed in microphonic transmitters has been denied of late with so much assurance and in such high quarters, that Mr.
It reaches the illiterate and the informed, the young and the old, the civilian and the soldier in the front line, the policy makers and the inarticulate masses. So great is the importance of radio to-day that the seizure of a defeated nation's transmitters has become one of the primary spoils of war."
Condensers for spark telegraph transmitters can be ordinary Leyden jars or glass plates coated with tin or copper foil and set into a frame, or they can be built up of mica and sheet metal embedded in an insulating composition. The glass plate condensers are the cheapest and will serve your purpose well, especially if they are immersed in oil.
This device is built on exactly the same principle as the telephone induction coil just described but it is more effective because it is designed especially for modulating the oscillations set up by vacuum tube transmitters. As with the telephone induction coil, the microphone transmitter is connected in series with the primary coil and a 6 volt dry or storage battery.
But in all of the transmitters described of whatever type or kind the same fundamental device is used for setting up sustained oscillations and this is the vacuum tube. The Operation of the Vacuum Tube Oscillator.
But since the vacuum tube has been developed to a high degree of efficiency and is the scheme that is now in vogue for amateur stations we shall confine our efforts here to explaining the apparatus necessary and how to wire the various parts together to produce several sizes of vacuum tube telegraph transmitters. Sources of Current for Telegraph Transmitting Sets.
And here was a far more wonderful thing than a watch, a man with all his organs ingeniously contrived, cords and levers, girders and kingposts, circulating systems of pipes and valves, dialysing membranes, chemical retorts, carburettors, ventilators, inlets and outlets, telephone transmitters in his ears, light recorders and lenses in his eye: was it conceivable that this was the work of chance? that no artificer had wrought here? that there was no purpose in this, no design, no guiding intelligence?
Gladstone introduced his Bill for Home Rule in Ireland, no fewer than 1,500,000 words were despatched from the central station at St. Martin's-le-Grand by 100 Wheatstone transmitters. Were Mr. Gladstone himself to speak for a whole week, night and day, and with his usual facility, he could hardly surpass this achievement.
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