4. Mast Base Assembly AB-154/U. This
assembly consists of Guy Stake GP101/U attached to a
yoke and clevis pin assembly. The lowermost Mast
Section Assembly AB-35/TRC7 is placed in the yoke
and clevis pin assembly. The yoke and clevis pin
arrangement allows the mast assembly to be lowered to
the ground by pivoting around the stake.
5. Guy Ropes, Guy Plates, and Guy Stakes. These
items hold the mast assembly in a vertical position (fig.
11-13).
6. Reel Rl-28. Three of these reels are provided;
two are wound on each of the three reels.
7. Cable Assembly, Radio Frequency Cord
CG-107/U. The CG-107/U is a 68-foot length of
50-ohm, solid-dielectric, coaxial radio-frequency (rf)
cable, terminated in male Plugs PL-259-A.
8. Adapter M-442. The M-442 consists of an
angle bracket provided with Socket SO-259, an
insulated lead, and a ground lead that permits the
CG-107/U to be easily connected to Radio Sets
SCR-508, SCR-528, SCR-608, and SCR-628.
9. Adapter Connector UG-255/U. The UG-255/U
is required to adapt the CG-107/U to Receiver-
Transmitters RT-66/GRC, RT-67/GRC, T-68/GRC,
RT-246/VRC, RT-524/VRC, and Radio Sets AN/PRC-8,
AN/PRC-9, and AN/PRC-10.
10. Roll CW-50/TRC-7. The CW-50/TRC-7 is a
canvas roll with pockets and straps to hold the antenna
Figure 11-14.--Antenna base MP-68 mounted on mast.
components for transportation in the field. A shoulder
strap is provided for easy carrying.
Mast Sections AB-22/GR, AB-23/GR, and AB-24/GR.
11. Guy Plate. One guy plate is inserted between
The mast sections are copper plated, painted tubes of
the sixth and seventh sections of the mast assembly and
another between the eleventh and twelfth sections. The
high-strength steel that can be screwed together.
upper and lower guy ropes attach to these plates.
2. Antenna Base MP-68. The MP-68 (fig. 11-14)
is comprised of a ceramic feed-through insulator,
sockets for mounting the antenna elements, an M-359
WARNING
adapter, and a vise. The feed-through insulator permits
the vertical radiating antenna element socket to be
DO NOT CONNECT THE
connected through the M-359 adapter to the center
POWER CABLE BEFORE CON-
NECTING THE ANTENNA. HIGH
conductor of the CG-107/U. The three ground-plane
RADIO-FREQUENCY (RF) VOLT-
sockets and the outer conductor of the CG-107/U
AGES ARE PRESENT IN THE
connect to the metal framework of the antenna base. The
ANTENNA CONNECTOR WHEN
vise enables the antenna base to be clamped to the top
THE TRANSMITTER POWER IS
of the supporting mast assembly.
ON. ALSO, DO NOT TOUCH THE
3. Mast Section AB-35/TRC-7. Twelve sections
ANTENNA ABOVE THE INSU-
are provided for assembling the 30-foot supporting mast
LATING BOOT DURING TRANS-
assembly. Each section is tubular and has a male and
MISSION BECAUSE YOU CAN BE
female end that permit the sections to be fitted together.
SEVERELY BURNED.
11-17