Show VARYING inductance OF THE TUNING COIL how different forms forma of winding affect reception of long and short waves tuning toning ludith inductance for radio did far callus circuit lire are made in a variety of forms for short waves we es a the most met commonly used form ot of inductance Is the single layer solenoid lenold ao which la Is nothing more mom nor lest less than the coin ando mon man telling toll call reinstating consisting of a bin 1 gle fie layer of wire clr wound upon a 4 cylindrical form th the method used need to I 1 very vary the tha in duchance ducE B Ance of a tuning mining coll coil 1 slide which gives give single turn variations var lallona or a witch switch which usually varle the th in duc duchance tance in groups groupe of to tuna for very time cloae tuning ing where when eves even the turn to turn variation Is too coarse a series or short la in the tea circuit to Is necessary A closer variation of inductance Induct can do ba procured by splitting the number bomber a flown ow 1 coll I and a the total 1 d m Is decreased ceresa fi finally alien wh tiro he i fiall nig it en t tb inner neer cylinder is J exactly under ali do n the imura asmore the lud kilell ot at one no coll call neutrally tru llou that of the oilier lb ml Us the r all lien ud t at tee wait 1 ten arm A to a cm witly if we did the two 11 he 1 la TIC 2 in a vario nalter on no coll call re tates with aspect to the flaw ether instead of by bill tid tell ing in ud it out at all we the aae 1 la alg FI costor 2 if the of a a til vr I 1 dometer am r a on n R jarfors there them will be b R lots harfe out of look age aee which decreases the ratio mile ot of maximum to minimum let we I 1 lenith st to h tell th ill will t tune A s intact with windings winding oa ma ft apher ph leal surface end having n g a mall i IB Z mai e I 1 clearance between t rotor and d stator will give minimum leakage there them 1 la se an excellent oa a rio the market at the he present t pathea with a Bo called basket winding fiot bat only are the windings winding OB ma a bahe ph ical a surface but a cross crosa section of tile winding linding see am rig fig 8 ts is earn buch clat the adli capacity la Is to a minimum this Is accomplished by separating adjacent to tunu and crossing nia them the at right accles kim this bame as method of winding led dancea to is ampil applied ad to tile spider web coll call th the change la in length when using spider web colls calls Is aa by the us use of a series ol of I 1 c fly 3 a f fsr T f ay iy tv LF of turns turna in two and winding one half on a hollow hallow cylinder cylindrical I 1 cal tybe tabe anil ADS wind tog ing the second halt half on a slightly smaller cylindrical tube of such six size that tt it can ready easily be slid into the first one if nw the two coils coila are am coo con nested in series but in such auh a man nor ner that their magnetic fields inter lock lack a 8 continuous coati I 1 ue 1 at of sa I 1 duc can be had by moving the cell colla with respect to each other pig fig I 1 represents represent the t anning 19 coll all of tile the magnetic field in the same d larf tion fig 2 represents approximately a 1 the same winding as wag used need in ID fig 1 but wound on an two cinc concentric eatrue forms when the two colla coils of I 1 tig ig 2 are am separated the fields of the two me ta colla ah do not react and the inductance ta is the b he sum of t the I 1 separate inductances inductance a th of 1 the to two individual colla it A As tile the colls ara am brought closer set together the field of one me coil bucks shunt about variable conden sera since the colls coils are not no aa a R rule provided with tape tapa I 1 for far longer we wave length tile bank wound coll call 1 la used ad to red reduce the d distributed tri buted capacity in winding fulti layer put fig 4 shows how the turns of three thre liner eNNer bank wound blob ti are am arrn need ga the duo lateral coil call la Is an lio provement pro ocr r the bank wt wound coll in a duo katwal winding the no ton con ductoc in two me successive layers or ara not at parallel an A they ara 1 in the bank winding but cross each ether at an angle arah 1 in bur estimation basket wound vario will no dented capacity are am roost most efficient tor for short wave ave tuning timing white while duo lateral colls coil of large dia dlamatter nitter with a 1 small tua amount of shunted shouted capacity tor tuning are most efficient fw for long wave wan reception |