. QST . rminals later. At the conclusion of thewiring of the subassembly, connect power leadsthat will run to »Sic and J3, and attach a 2-inchlength of wire to Pin 5 of the 6J6. The free endof the latter will later be connected to /S2D. The remaining slug-tuned coils are mounted asa second subassembly on a bracket the same insize as the first, although the mounting lips mustbe bent in the opposite direction. The coils arearranged in three groups of four coils. The coilsare centered at the corners of a %-inch first square is centered on the strip and at^ inch from the front edge of t
. QST . rminals later. At the conclusion of thewiring of the subassembly, connect power leadsthat will run to »Sic and J3, and attach a 2-inchlength of wire to Pin 5 of the 6J6. The free endof the latter will later be connected to /S2D. The remaining slug-tuned coils are mounted asa second subassembly on a bracket the same insize as the first, although the mounting lips mustbe bent in the opposite direction. The coils arearranged in three groups of four coils. The coilsare centered at the corners of a %-inch first square is centered on the strip and at^ inch from the front edge of the strip. Thesecond square is centered 23/^ inches from thefront edge, and the last square is centered 35^inches back. At the center of each of the twosquares toward the front a hole is drilled for a1-inch 6-32 screw. A soldering lug and a %-inchmetal spacer are slid over the screw before it isfastened to the bracket. The lugs are convenientgrounding terminals. Before the coils are mounted, this bracket. Fig. 1 — Circuit diagram of the crystal-controlled mobile converter. All resistors J^ watt. *Indicates a tubularceramic capacitor; all other fixed capacitors disk ceramic. C3 — S5-nti{. variable (Hammarlund HF-35). Li through Le — See coil chart. Ji, J2 — RCA-type phono jack. J3 — 4-prong male chassis connector (Cinch-Jones ).RFCi — choke (National R-IOOS).RFC2— 10-mh. choke (National R-IOOS). inches wide. This piece is spaced 1^ inchesfrom the bracket and is supported from it at thefour corners by long 6-32 screws with metal spac-ers. It has %-inch holes opposite the two insidecoil forms, and 5^-inch holes to clear the chokes. Before assembling the unit, the antenna coils(L3) should be wound on each of the two L4forms. Each of the North Hills coil forms has anextra set of terminals that may be used as tiepoints for the switch ends of the L3 windings.(By judicial use of these extra terminals, it ispossible to complete the wiring o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
