. Elements of radio telephony . samedirection in the two coils. Where the coils are connectedso that the direction of current flow is opposite in the twocoils the 2M is subtracted instead of being added. Li andL% the self-inductances of the coils, and M the mutual induc-tance of the two coils may be computed for simple casesfrom tables. The effect that mutual inductance has uponthe parallel connection of inductance coils is rather com-plicated and beyond the scope of this volmne. Electrical Equivalent of the Antenna.^—The ordinaryelevated antenna is really a large-sized condenser, one plateof
. Elements of radio telephony . samedirection in the two coils. Where the coils are connectedso that the direction of current flow is opposite in the twocoils the 2M is subtracted instead of being added. Li andL% the self-inductances of the coils, and M the mutual induc-tance of the two coils may be computed for simple casesfrom tables. The effect that mutual inductance has uponthe parallel connection of inductance coils is rather com-plicated and beyond the scope of this volmne. Electrical Equivalent of the Antenna.^—The ordinaryelevated antenna is really a large-sized condenser, one plateof which is represented by the elevated wires, and the otherone by the ground or counterpoise. The wires of the antenna have inductance, hence theequivalent circuit would be represented as shown by thedotted hues in Fig. 28. On account of the fact that the in-ductance and capacity are uniformly distributed along thelength of the antenna it is not possible to represent anantenna by single concentrated inductances and RECEIVING EQUIPMENT 59 but values can be selected which will exactly represent theelectrical equivalent at any single frequency. Antenna Series Condensers and Inductances.—To reducethe wave length a condenser should be inserted in serieswith the antenna. This gives a circuit in which two con-densers are connected in series and thus reduces the wave
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradio, bookyear1922
