CE-1008
n.
Remove the test connections and replace the original wiring.
CAUTION
The differential control transmitter will overheat if connected to the 115-voit AC for any length of
time. If the zeroing procedure cannot be accomplished quickly, use an autotransformer and 70-
volts AC.
A.
The antenna consists of a 9-foot fibreglas paraboloidal reflector fed by a log-periodic dipole feed. The
antenna is capable of generating any one of four modes of polarization: horizontal, vertical, right-hand 45 degrees, or
left-hand 45 degrees linear. Polarization selection is controlled from the remotely located Control Indicator and
implemented by a polarization unit (refer to paragraph 5, this section) which rotates to place the feed at the correct angle
for the polarization selected. An electromechanical linear actuator is installed between the polarization unit and the
dipole feed. The actuator contains a motor-driven shaft which displaces the feed in respect to the focal point of the
reflector, broadening the secondary radiation pattern and reducing the gain of the antenna. Beam broadening is also
remotely controlled by the Antenna Position Control Indicator.
B.
The 9-foot diameter antenna reflector is constructed of 1/8-inch thick fiberglass which contains a metallic
coating to provide the required reflectivity. It is formed with a circular center section about 40 inches in diameter and
four equal segments which fit around the perimeter of the center section. The five parts of the dish are fastened together
by quarter-turn, tee-handle, quick-release pins on the inside flanged edges and quarter-turn clasp hook fasteners around
the outer rim. The four outer segments are easily fastened to the center section and adjacent sections by inserting the
quick release pins which are captive or short lengths of flexible cable adjacent to the attaching holes. The outside
segments are clamped together at the perimeter by four three-quarter inch, hex-head, eccentric cam fasteners. The
dipole feed is mounted on the electromechanical actuator which, in turn, is mounted on the polarization unit and is
correctly oriented on the polarization unit by key pin-hole arrangement. The feed-polarization unit is held in place at the
focal point of the reflector by three supports secured to the outer rim of the reflector. These supports and the attaching
hardware have been predrilled for key pins to assure that the feed is installed at the reflector focal point during assembly.
5-10
Previous Page
