FIGURE 60. Core Materials of Loading
Coil.
c. Commercially, at the present time, only
land cables are loaded in the United States. For open-
wire lines, excessive distortion is overcome by the use
of compensating or corrective networks, and excessive
line losses are compensated for by means of repeaters
or amplifiers. For military purposes, however, both
cables and field wire lines are loaded to increase the
talking range. Figure 61 shows one of the loading coils
used in military applications.
This coil has an
inductance of 88 millihenrys.
It is inserted at
approximately 1-mil intervals on field wire. In order for
loading to be effective in increasing the talking
FIGURE 61. Typical Loading Coil and
Symbol.
131
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