. The Bell System technical journal . liK. l> Hi 11 I l\|iii,ii (.Duplinj; Wire liiblallaliun Sliowiiig CouplingU ire Tuning Lnil shown the schematie diagram of the wire eoupling circuit and Fig. 19illustrates the character of the resonant peaks secured In- this series inductances L\ and tlie lenninaiinn inductance Li are\arial)Ie and by adjusting liuni iht- points of resonance may be CANKirR (h\ men kw sliiltid Id lorirct lor in iIr- rmipliiii; win- Inr ililTiri-nt \\\:,. 20 illiisiiati
. The Bell System technical journal . liK. l> Hi 11 I l\|iii,ii (.Duplinj; Wire liiblallaliun Sliowiiig CouplingU ire Tuning Lnil shown the schematie diagram of the wire eoupling circuit and Fig. 19illustrates the character of the resonant peaks secured In- this series inductances L\ and tlie lenninaiinn inductance Li are\arial)Ie and by adjusting liuni iht- points of resonance may be CANKirR (h\ men kw sliiltid Id lorirct lor in iIr- rmipliiii; win- Inr ililTiri-nt \\\:,. 20 illiisiiati-s a tspicalfarruT tiiiniiial installation rmplox inn h- win- coupling, nuthod. The onK point in of tlir wire couplini; as coniparrd with thecondenser coiiplini; is the lad liiai for power line^ ol \oltai;e> liii;her. l-ig. 17—Coupling Wire Tuning Unit than . K.\. it is somewhat cheaper. On the other hand condensercoupling is much more etiticient, thereby increasing the range andreliability of the system. It also permits high quality transmission,the transmission through it is not affected by small variations infrequency, and the component parts are of constant value determinedat the time of manufacture and require no adjustment at the timeof installation. In addition to these advantages the inspection andmaintenance of the condenser is easier than for the coupling wires. Pr()Ti;( TivE Mk.\sires In considering the problem of safety to the operating personneland the equipment from the power line voltage, the normal insulation 170 BELL SYSTEM TECHNICAL JOURNAL supplied by tlie high voltage coiulenser where it is employed or bythe air separation where the coupling wires are employed, is dis-regarded, since this insulation ma\- fail, thereby apiiKing the powerline voltage to the line terminals of
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
