CL40 Antenna Technical Instruction Manual Page 1-1
Section 1 General Information Issue 3.0
CL40 ANTENNA
TECHNICAL INSTRUCTIONS
Section 1 GENERAL INFORMATION
1.1 INTRODUCTION
This antenna is intended primarily for use
with low and medium powered transmitter/
antenna tuning unit systems in the LF and
MF bands. It is particularly intended for use
with aeronautical and marine radio
beacons (NDBs).
1.2 FACTORY SUPPORT
Nautel provides after sales factory
support. Technical assistance is available
on a 24 hour, seven days a week basis. A
factory service facility for repair of
modules/assemblies is also available.
Refer to the Factory Support portion of the
Warranty pages at the front of this manual
for additional information.
1.3 PURPOSE AND SCOPE OF
MANUAL
This Technical Instruction manual
provides the information required to
install, operate and maintain the
equipment.
1.4 PURPOSE OF EQUIPMENT
When combined with an appropriate
transmitter system, the CL40 antenna
provides reliable facilities for an NDB
reference station.
1.5 MECHANICAL DESCRIPTION
The antenna consists of a free-standing
tubular mast, topped by a hexagon-shaped
capacitive loading structure (or top hat)
which provides the necessary load for RF
current flow. The top hat and the upper half
of the mast are isolated from the lower
mast by a high voltage insulator. Both mast
and top hat are constructed from
lightweight aluminum alloy for easier
transportation and erection and reduced
maintenance requirements. The lower
antenna mast is secured with two clamps
to an aluminum alloy pipe (anchor post)
section which is normally embedded in
concrete. A winch is secured to the anchor
post and connects to the lower antenna
mast with its 3/16” stainless steel wire rope.
Mounted below the mast insulator is the
loading coil enclosure with its upper end
connected to the top hat via the upper mast
section and its lower end connected to a
solid copper wire downlead. A cowl
protects the insulator from direct
precipitation. The downlead is supported
approximately twelve inches distant from
the tower by insulating spacers and carries
the RF current to the antenna loading coils
from the antenna tuning unit (ATU) which is
located on the anchor post at a convenient
height near ground level.
A ground plane of copper radials provides
the RF current return path and completes
the system.
1.6 TOOLS
Table 1-1 lists the tools that are required
to install and maintain the CL40 Antenna.
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