24. A radio set AN/PRC-77, with antenna AT-984A/G, transmitting to a
receiving station equipped with a whip antenna has a transmitting
range of approximately--
a. 8 kilometers.
b. 12 kilometers.
c. 19 kilometers.
d. 25 kilometers.
////////////////////////////////////////////////////////////////////////////
ANSWERS:
21.
b.
22.
b.
23.
c.
24.
c.
////////////////////////////////////////////////////////////////////////////
12. ANTENNA SYSTEM RC-292.
Antenna equipment RC-292 (Fig 14) is an
elevated, wide-band, modified ground-plane, quarter-wave antenna designed to
increase the transmission range of FM radio sets by 50 to 200 percent. The
frequency range (20.0 to 76.0 MHz) is compatible with the frequency range of
all low- and medium-power FM radio sets issued to field artillery units.
The sections of the supporting mast base raise the antenna 9 meters above
the ground, thus increasing the line-of-sight distance to the horizon. The
vertical element above the mast base is the antenna (Figure 14). The three
ground-plane elements are installed at a 140 angle to the antenna and act
as a counterpoise. The antenna is connected to the radio set by a 20-meter
coaxial cable.
The antenna is vertically polarized and radiates an
omnidirectional pattern.
The length of the antenna and ground-plane
elements must be preadjusted to the desired transmitting frequency, because
the number of antenna sections used varies according to the frequency being
transmitted.
The disassembled RC-292 is transportable (hand or vehicle).
When disassembled, it is packed in a canvas roll (Fig 15).
This antenna
system weighs 48 pounds and can be assembled and erected by two trained
personnel in 15 minutes.
21
Previous Page
