. The thermionic vacuum tube and its applications . currents of constant ampli-tude to the antenna. If now an audio frequency voltage beimpressed on the grid of the modulator, audio frequency currentsare established in the output circuit of this tube and consequently1 See Craft and Colpitts, Proceedings, , Vol. 38, p. 360, 1919. 324 THERMIONIC VACUUM TUBE the potential of the plate of the oscillator varies in accordancewith the low frequency, thus producing low frequency variationsin the amphtude of the high frequency oscillations obtained fromthe oscillator and impressed on the antenn
. The thermionic vacuum tube and its applications . currents of constant ampli-tude to the antenna. If now an audio frequency voltage beimpressed on the grid of the modulator, audio frequency currentsare established in the output circuit of this tube and consequently1 See Craft and Colpitts, Proceedings, , Vol. 38, p. 360, 1919. 324 THERMIONIC VACUUM TUBE the potential of the plate of the oscillator varies in accordancewith the low frequency, thus producing low frequency variationsin the amphtude of the high frequency oscillations obtained fromthe oscillator and impressed on the antenna. The coupling isadjusted by sliding the contact Q as explained in connection withFig. 179 in Chapter VIII. A number of modulating and transmitting circuits have beensuggested. The circuit shown in Fig. 194 ^ is another illustrationof the application of the principles given in the foregoing. Thiscircuit is so arranged that the high frequency is impressed at H. such a way that the grids of both tubes are in phase. The high Low FrequencyChohe. High FrequencyChoke
Size: 1662px × 1503px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidthermionicva, bookyear1920
