CL40 Antenna Technical Instruction Manual
Page 2-5
Section 2 Preparation for Use and Installation
Issue 3.0
(m) Attach the wire assy (item 8) between
the enclosure’s output connector and
the upper mast section. Use 2 gear
clamps (item 47). Shape the wire assy
so it is at least 6” from the enclosure.
Attach the down lead assembly (item
16) to the enclosure’s lower
connection. Use the hex key (Nautel #
HY66) in the ancillary kit to terminate
items 8 and 16 to A1. Attach the down
lead to each down lead insulator assy
(item 18) using the clips on the down
lead insulator. Shape the down lead
so it is clear of the mast. Remove any
slack and kinks in the down lead and
pull as straight as possible. Leave the
lower end loose for now. Place the top
clamp assembly (item 21), less the
outer saddle, over the top of the
anchor post. See Figure 2-4.
(n) Install the two ATU mounting bracket
assemblies (item 22) to the back of
the ATU using the hardware existing
on the bracket assemblies. This may
require relocating and reversing the
four mounting angles to the back of
the ATU. Attach the ATU to the
anchor post below the top clamp
assembly such that the winch handle
will clear freely. See Figure 2-16.
(o) Winch the antenna into its final position.
NOTE
Do not raise the antenna if local winds are
greater than 10 mph (16 kmph).
Using a steady, even action on the
winch to avoid excessive flexing of the
mast, raise the antenna to its vertical
position. Position the top clamp
assembly so it does not interfere with
the swing of the winch handle. Install
the outer saddle and snug up the nuts
just enough to hold the assembly in
place. Install the outer saddle on the
bottom clamp assembly and firmly
tighten. Adjust the verticality of the
mast as required. Firmly tighten the
top clamp assembly. Attach the down
lead to the output insulator on the top
left side of the ATU. Bend the down
lead as shown to provide a drip loop.
See Figure 2-2.
(p) If a ground plane (item 27) has been
purchased install it as shown in Figure
2-15a (30 radials) or 2-15b (60
radials). Make all joints by wrapping a
minimum of four turns of one wire
around the other and soldering.
(q) For a concrete base, drive the ground
rod (item 24) into the ground within
two feet of the base. For a non-
standard base, provide a low-
resistance termination point (not the
ground plane) near the base. Connect
the ground wire assembly (item 14) to
the bottom of the lower mast section
using the 3/8 x 1 galvanized hex head
bolt (item 56) complete with 3/8
hardware (items 51, 50 & 49).
Connect ground wire (item 36) and the
three polyethylene covered wires from
the ground plane to the ground bolt on
the bottom left of the ATU. Use the
ground rod clamp (item 25), or other
suitable means, to connect the ground
wires from the lower mast (item 14)
and the ATU (item 36) to the ground
rod (item 24) or low-resistance
termination. See Figures 2-1 and 2-5.
NOTE
The ground mat (see Figure 2-15a or
2-15b) forms an integral and necessary
part of the antenna system, providing the
return path for RF current flow. Avoid any
alteration to your particular configuration
as it will likely reduce antenna efficiency.
(r) Antenna erection can be done by
vehicle or block and tackle, using the
anchor post as a gin pole (see insert
in Figure 2-1). It is necessary to attach
some form of guide device to the top
of the anchor post to keep the hoist
cable in position. Whatever method is
used, attachment to the mast must
always be via the lifting bracket.
