. Annals of the New York Academy of Sciences. Science. ARMSTRONG, OPERATING FEATURES OF THE AUDION 235 mospheric disturbances produce a musical note due to shack excitation of the audio frequency system. Very loose coupling with the wing cir- cuit of the first audion is a partial remedy for this. There are times, however, when interference is more troublesome than static, and in such cases the method may be used to great advantages. If desired, both radio and audio frequency tuning can be carried out in the same audion as indicated in Fig. 22. This combination is apt to be somewhat trou- bleso
. Annals of the New York Academy of Sciences. Science. ARMSTRONG, OPERATING FEATURES OF THE AUDION 235 mospheric disturbances produce a musical note due to shack excitation of the audio frequency system. Very loose coupling with the wing cir- cuit of the first audion is a partial remedy for this. There are times, however, when interference is more troublesome than static, and in such cases the method may be used to great advantages. If desired, both radio and audio frequency tuning can be carried out in the same audion as indicated in Fig. 22. This combination is apt to be somewhat trou- blesome to operate as a cumulative amplification is obtained in the audio frequency as well as in the radio frequency system. Cascade Systems Where a greater amplification than can be obtained with one audion is required, cascade working of the radio frequency systems may be' re-. FiG. 28 sorted to by coupling together two or more audion systems, each con- nected as already described, in. the manner indicated in Fig. 28. The incoming oscillations in the first audion system are amplified in the usual manner and set up oscillations in the second system by means of the coupling ilfg. The oscillations initially set up in the second system are again amplified, and then rectified in the second audion to produce audi- ble response in the telephones. For the reception of spark signals, con- siderable adjustment is required to get the best results without causing one or the other, or both, of the systems to generate oscillations. It will be found that after the first circuit is adjusted to the point of oscillation and the second is coupled with it, the strength of signal in the first sys- tem will be reduced owing to the withdrawal of energy from it by the second system. The signals may then be again brought up in strength by increasing the coupling between the grid and wing circuits of the first. Please note that these images are extracted from scanned page images that may have been digital
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
