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The only difference between this transmitter and the preceding one is that: two 5 watt tubes are used, the first serving as an oscillator and the second as a modulator; an oscillation choke coil is used in the plate circuit; a reactance coil or reactor, is used in the plate circuit; and a reactor is used in the grid circuit. The Oscillation Choke Coil.
Any of the receiving sets described in the foregoing chapters will respond to either: a wireless telegraph transmitter that uses a spark gap and which sends out periodic electric waves, or to a wireless telephone transmitter that uses an arc or a vacuum tube oscillator and which sends out continuous electric waves.
"If you had your rubbers on it would only jar you slightly. You'd just hit the earth and then bounce back again, but there's no use of talking about that, because it never happened but once. It happened to a chap named Blenkinson, who took an Oscillator that hadn't any brake on it. He was one of those smart fellows that want to show how clever they are.
The transmitter was completely 'home brew', consisting of a metal 6L6 Franklin oscillator on 3.5 MHz followed by two more 6L6s doubling to 14 MHz. In the final amplifier stage Harry used a Telefunken pentode, the famous and very efficient RL12P35 which was used in the German tank transmitters in all stages, oscillator, P.A. and audio amplifier/suppressor grid modulator.
The size you require for this set has an output of 160 milliamperes and it will supply current for one to four 5 watt oscillator tubes. This size of reactor costs $11.50. Connecting Up the Apparatus.
Alternation Current Power Transformer. Connecting Up the Apparatus. It will be observed that a storage battery is not needed as the secondary coil of the transformer supplies the current to heat the filament of the oscillator.
It's only my second cigar since I came to the Gardens...." The byplay needed to make this intelligible may be imagined, without description. Does not the foregoing lay further stress on the curious fact that the passée young lady and the oscillator between Pall Mall and that Club at St. Stephen's this describes the earlier seeming of these two have really vanished from the story?
Where an initial alternating current is used for wireless telephony, the current must be rectified first and then smoothed out before passing into the oscillator tube to be converted into oscillations.
To detect the electromagnetic waves Hertz employed a simple form of oscillator, which he termed a resonator. But it was not sensitive enough to detect waves at any great distance. Before wireless telegraphy could become practicable, a more delicate detector was necessary.
Connecting the oscillator tubes up in parallel means that the two filaments are connected across the leads of the storage battery, the two grids on the same lead that goes to the aerial and the two plates on the same lead that goes to the positive pole of the generator. Where two or more oscillator tubes are used only one storage battery is needed, but each filament must have its own rheostat.
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