. Practical wireless telegraphy; a complete text book for students of radio communication . litudeof the locally generated oscillations be carefully regulated for maximum response. 284 PRACTICAL WIRELESS TELEGRAPHY. 1 PUOTRON KJ vacuum valves, have been found suitable to the reception of undamped oscillations; in fact,the majority of these circuits are equally well adapted for the reception of damped oscilla-tions, but, as mentioned previously, the normal note of a spark transmitter is distorted whenthe maximum amplification is obtained. (a) G. E. Amplication Relays. One system of connecting m
. Practical wireless telegraphy; a complete text book for students of radio communication . litudeof the locally generated oscillations be carefully regulated for maximum response. 284 PRACTICAL WIRELESS TELEGRAPHY. 1 PUOTRON KJ vacuum valves, have been found suitable to the reception of undamped oscillations; in fact,the majority of these circuits are equally well adapted for the reception of damped oscilla-tions, but, as mentioned previously, the normal note of a spark transmitter is distorted whenthe maximum amplification is obtained. (a) G. E. Amplication Relays. One system of connecting magnifying relays for thepurpose of first increasing the amplitude of the oscillations of radio-frequency is set forth m Fig. 296, which is amethod of connectionparticularly suited to thepliotron oscillators of theGeneral Electric Com-pany. It is to be observedthat the usual grid con-denser is excluded fromthe circuit of all valvesexcept the last oscillations ofradio-frequency, are re-peated from one bulb tothe other, and in the lastbulb they are made audi-ble by being RADIOFREOUENCYTRANSFORMER RADIO EREOUCNCYTRANSFORMER Fig. 296- -Showing the General Electric Companys Cascade Connection ofElectron Relays. e. g., each group of oscillations places a charge in the grid condenser which has a relayingeffect upon the battery circuit of bulb No. 3 (over the duration of a wave train), causing asingle sound for each spark of the distant transmitter. The foregoing explains the functioning of this circuit during the reception of dampedoscillations, and it should be mentioned that this system for repeating radio-frequenciesaffords a marked degree of selectivity. For example, if each of the tuned circuits is adjustedto give response to the incoming signal which has 20 times the strength of an interferingsignal and furthermore the desired signal is amplified ten times by each oscillation valve, it isself-«vident that the interfering signal will practically disappear in t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
