. QST . 4: wavelength.) The coils are made fromB & W inductors, as shown in the table. Afterdetermining the proper number of turns for eachcoil, the coil was cut and mounted on a 3^ X%-inch piece of ^le-inch poljstyrene, using Poly-weld 912 coil dope, and banana plugs. The typeof construction can be seen in the coils were adjusted by starting with too muchinductance, and decreasing the size one turn at atime, tapping the coil with a small alligator of the proper inductance was obtainedby observing the S meter of a receiver each timethe tap was changed. The receiv
. QST . 4: wavelength.) The coils are made fromB & W inductors, as shown in the table. Afterdetermining the proper number of turns for eachcoil, the coil was cut and mounted on a 3^ X%-inch piece of ^le-inch poljstyrene, using Poly-weld 912 coil dope, and banana plugs. The typeof construction can be seen in the coils were adjusted by starting with too muchinductance, and decreasing the size one turn at atime, tapping the coil with a small alligator of the proper inductance was obtainedby observing the S meter of a receiver each timethe tap was changed. The receiver was located. The loading coils are mounted on polystyrene stripsfitted with banana plugs. about 100 feet away, with the antenna terminalsgrounded. The size of the coils given in the tableshould be fairly accurate for any installation, pro-vided the length of the two antenna sections is thesame as ours — 64 inches above the coil, and 20inches below. The length of antenna above thecoil has the most effect on the required induc-tance, longer lengths requiring less antenna in our installation is fed through 53^feet of coaxial cable by a link on the final tankcoil. The cable consists of the regular auto an-tenna lead-in, plus a 3-foot extension made ofRG-59/U. Results The over-all efficiency of the antenna seems tobe quite good. Two-way checks have been madewith a fixed station using a nondirectional an- COIL TABLE Band B <kW Type Turng 40 3907-1 30 20 3907-1 6 10 3010 4 Type 3907-1 ia 2-inch diam., 10 turns per inch, No. 3010 is ?^-inch diam., 8 turns per inch, No. 18. tenn
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
