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Updated: May 1, 2025
"Audio, P. C. mihi objici quod non virile munus impleverim, Zenobiam triumphando. Nae illi qui me reprehendunt satis laudarant, si scirent qualis ilia est mulier, quam prudens in consiliis, quam constans in dispositionibus, quam erga milites gravis, quam larga quum necessitas postulet, quam tristis quum severitas poscat.
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.
Where a six step amplifier, that is, where six amplifying tubes are connected together, or in cascade, the first three are usually coupled up with radio frequency transformers and the last three with audio frequency transformers. A radio frequency transformer is shown at B and costs $6 to $7. An Audio Frequency Transformer Amplifying Receiving Set.
Run this wire on over and connect it with the first post of the second rheostat, the second post of which is connected with one terminal of the filament of the first amplifying tube; then connect the first post of the rheostat with one end of the secondary coil of the first audio frequency transformer, and the other end of this coil with the grid of the first amplifier tube.
King studied the photographs for quite awhile, then pulled his log book over and made an entry. He wrote: 8:20:19:3142:1x. The last three digits meant that he wasn't sure about the intensity, and the "x" signified a continuous reading. King turned to the audio controller, "Do me a favor, Gus, but strictly unofficial.
Where audio frequency transformers are used for stepping up the voltage of the current of the detector and amplifier tubes, the radio frequency current does not get into the plate circuit of the detector at all for the reason that the iron core of the transformer chokes them off, hence, the succeeding amplifiers operate at audio frequencies. A Six Step Amplifier Receiving Set With a Loop Aerial.
Finally connect one end of the tickler coil of the tuner with the plate of the detector tube and connect the other end of the tickler to one end of the primary coil of the first audio frequency transformer and the other end of it to the wire that connects the two B batteries together.
But that was miles away, and in the meantime we were ascending a lovely valley, pines, grass, and bright red soil. It was delicious that morning, riding under the pines. "Pinea brachia cum trepidant, Audio canticulum zephyri!" And part of the pleasure was due to the fact that we had an unobstructed view in all directions, usually not the case in the tropical forest.
"You don't like this?" the Captain asked. Matesic said he didn't like it. "And King said he didn't like it?" "King thinks the same way I do, he's been on there too damn long and too damn consistent." "Pick him up," the Captain turned and ordered the audio controller. "If we can't hold him, we can at least get a look at him." "It's not too clear yet," said Matesic, "it'll take a spread."
To receive wireless telegraph signals, however, from a transmitter that uses an arc or a vacuum tube oscillator and which sends out continuous waves, either the transmitter or the receptor must be so constructed that the continuous waves will be broken up into groups of audio frequency and this is done in several different ways. The heterodyne method will be described in this chapter.
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