. Practical wireless telegraphy; a complete text book for students of radio communication . ations is considerableand results in a loss of energy (due to the dissimilarity of the wave length adjustment ofthe primary and secondary circuits). Now the effect of coupling the sensitizing circuits to the grid circuit, is to give thelatter two frequencies of oscillation differing by 1,000 to 1,500 cycles. By adjusting the systemto oscillate at one of the resulting frequencies and having the other coincide with that of theincoming oscillations, zero reactance is obtained and the signal strength accord
. Practical wireless telegraphy; a complete text book for students of radio communication . ations is considerableand results in a loss of energy (due to the dissimilarity of the wave length adjustment ofthe primary and secondary circuits). Now the effect of coupling the sensitizing circuits to the grid circuit, is to give thelatter two frequencies of oscillation differing by 1,000 to 1,500 cycles. By adjusting the systemto oscillate at one of the resulting frequencies and having the other coincide with that of theincoming oscillations, zero reactance is obtained and the signal strength accordingly to the severe discharges of atmospheric electricity experienced at the U. S. NavalStations, it has been found necessary to connect the grid of the valve to earth through asmall variable condenser; for, otherwise, communication between the naval stations couldnot be maintained. No explanation of the function of the audio-frequency impedance coils, with the ironcores, has been advanced. It is needless to say that many other circuits, when used in connection. with the. .Fig. 295—Beat Receiver Circuits as Employed atU. S. Naval Stations. •This is an important consideration in the operation of the heterodyne, namely, that the amplitudeof 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-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
