Show 17 14 aw ae ong edited by 0 douglas editor of F X fit 19 A FIG 2 e if ap W bozzy ap ai top loft left shows form for edge wound backet Basket weave goll right method of tying this typo coll lower left solenoid form for basket weave colli coils lorenz winding right form for spiderweb spider web coll low loss colla coils require large wire rood good spacing between turns and preferably no supporting dielectric it II one uses a supporting tube or framework lie he must be sure it to la high quality keeping metal out of the field of the coll coil Is important the method of winding of itself Is not essential entla to low loss construction but certain methods of wiring help held in many ways to make possible the requirements quire ments set forth A basket weave coll for instance necessarily means spacing between turns and rather largo large wire the difference between the various ways of winding Is shown in the figures of course every one knows that a coll coil wound on a tube or so that the completed coll coil itself forms a tube Is known as a solenoid winding it Is probably thi the most common form of winding wo we find then there Is spiral winding in which the diameter of the colls coils progressively increases one turn Is wound on top of the othor other outward so the resulting colt coll Is one turn wide it resembles somewhat the flat pancake type tile the form for which Is at the right of fig 2 tills this type Is called the spiderweb spider web coll coil for obvious reasons the inner diameter or diameter of the first turn Is usually about an inch and a half there must be an odd number of slots usually the winding goes in one slot and out the other under and over each spoke in turn there Is no reason why it should not go under two andover two just as in the lorenz windings shown in the other figures the usual reinartz coll coil Is a spiderweb coll coil and can be very easily made by cutting a 0 to 8 inch disk of dielectric and slotting it after the manner shown characteristics of colls coils basket weave colls coils are of two types edge wound resembling the spiral and spiderweb spider web or solenoid wound resembling the coll coil on a tube the same forms may be used for basket weave as for lorenz and are illustrated in figs I 1 and 2 in fig 1 la Is shown the most convenient form you can have around the worktable work table atas it Is a center disk with 13 cylindrical spokes the made up form may be purchased complete it may be made from a sawed off on piece of curtain rod and 18 13 spokes the spokes roust must be removable however there must be an odd number of them and they can be any material as can the ceriter center thirteen Is just a convenient lucky number in winding the edgewise basket weave the wire will go over one spoke and under the next over and under one spoke at a time the resulting coll coil will be a latticework effect similar to the reed baskets so often seen or reed furniture in winding the lorenz lorena coll coil go over two spokes and under two over and under two at a time continually because there Is an odd number you will continually shift the starting point each turn as shown at the left of fig it 1 while both first and second turns tuma start by going over spoke A one goes over and one goes under tinder spoke B this la Is because of the odd number of spokes not divisible by two the resulting coll coil Is shown at the right of fig 1 with more of a trellis effect both sides eldes are smooth while neither side of the basket weave Is smooth the basket weave however la Is self holding but the lorenz coll must be tied with string at the corners as indicated dica ted before pulling out the spokes that la Is ther the white bilte cord one sees on the colla coils sold commercially the winding the spiderweb spider web coll requires ulrea the winding form to remain in the coll the lorenz type requires tying up the basket weave Is self supporting and self holding the spiderweb spider web lias has somewhat less inductance than either of the others for the same number of tunia thi the others do not maj serially terin teri ally lly except in amount of wire an ana 11 size of coll coil for the same earne number of turns both the basket weave and the lorenz winding may take on the solenoid form by using the winding device shown in fig fie 2 here instead of spokes of a wheel we have pins arranged in a circle and forming really a latticework tube take a board strike a 8 inch circle and drive in spikes equally spaced or erect pins ping in the board there must be an odd number usually 15 aroused are used but any odd number can bo be used and of course the smaller the diameter the less the number of pins in the solenoid noid type the coll coil will slip off on the tha pins so BO the pins are not remo removable Table from the board necessarily la in the solenoid winding as an in the edgo edge winding the basket weave coll coil Is obtained by winding over and under ono one pin nt at a time the lorenz winding la Is obtained as shown by tile the dotted line hue winding in and out over and under two pins at a time there Is no more real satisfaction in construction to bo be obtained than to wind a set of lorenz colls coils both of the solenoid and the edge type the finish and appearance Is 13 perfect with these homemade home made colla coils in both cases do not forget to tie up the corners be fore removing the coll coil from the form whether alit ther solenoid or edge in general for number of turns follow the same standard lis as the honeycomb or as the solenoid but wind a few more turns turna than specified for either it to la a simple matter to u unwind a turn or two and cut off the wire but adding a turn or two means soldering on a piece of wire each time |