The principles underlying radio communication (1922)
United States. National Bureau of Standards, Ould, Richard Sheldon, 1889-, United States. Army. Signal Corps · Washington, Govt. Print. Off. · leaf 339
e (Fig.179). With flatspirals only a fewturns are used, sincethe inner turns rapidly become less useful as the area dimin-ishes. The spiral type of coil is comparatively little used in theUnited States. The usual type of coil antenna consists of one or more turnsof wire wound on a square or… … TONLXTSTAG L OFAMPLIFIER FIG.I79A •SIMPLE.C01LANTE.NNA CIRCUIT. COIL ANTENNAS. 335 wire used for a coil antenna may be No. 20 or No. 22 ordinary-insulated copper wire, with solid conductor. The spacing of the turns of a coil depends on the allowablecapacity of the coil. Spacings of one-half inch…
Telegraph, Wireless · Radio
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