C463 Multiwire Broadband Dipole Antenna
(2–30 MHz)
Introduction
The C463 Multiwire Broadband Dipole Antenna is available in the following
power ratings:
Power rating Codan part number
250 W PEP 15-00463-001
500 W PEP 15-00463-002
1 kW PEP 15-00463-003
The antenna is designed for fixed station multi-frequency operation. These
instructions apply to all power ratings of this antenna.
There is a glossary of terms at the end of these instructions.
The C463 antenna is suitable for erection in the inverted V or horizontal
configuration. The inverted V configuration requires only one main mast,
however the horizontal configuration is more efficient. For both
configurations, a main mast height of 9 to 10 m is adequate, providing
optimal communications over a short distance (0 to 600 km). Long-distance
communications require a taller main mast of 15 m. The horizontal
configuration is recommended for this distance.
NOTE The minimum required height of the main mast is 6 m.
The C463 antenna is packed completely assembled, ready for erection. The
parallel wires of the antenna are raised in the horizontal plane, regardless of
the configuration used. In some instances, the antenna is supplied with a
coaxial cable for use with the installed antenna. If you are supplying your
own coaxial cable, the connectors must be PL259 UHF-style.
INSTALLATION
© 15-00463-901 Issue 1, September 2005 Page 1 of 11
Head office Asia Pacific EMEA Americas
Codan Limited
ABN 77 007 590 605
81 Graves Street
Newton SA 5074
AUSTRALIA
Telephone +61 8 8305 0311
Facsimile +61 8 8305 0411
www.codan.com.au
Codan Limited
81 Graves Street
Newton SA 5074
AUSTRALIA
Telephone +61 8 8305 0427
Facsimile +61 8 8305 0410
asiatech.support@codan.com.au
Codan (UK) Ltd
Gostrey House
Union Road
Farnham Surrey GU9 7PT
UNITED KINGDOM
Telephone +44 1252 717 272
Facsimile +44 1252 717 337
uktech.support@codan.com.au
Codan US, Inc.
8430 Kao Circle
Manassas VA 20110
USA
Telephone +1 703 361 2721
Facsimile +1 703 361 3812
ustech.support@codan.com.au
C463 Multiwire Broadband Dipole Antenna (2–30 MHz)
Installing a C463 antenna in an inverted V configuration
The C463 antenna may be erected using the gibbet included with a Codan mast (mast
gibbet), or using the gibbet included with the antenna (antenna gibbet). This gibbet may
be attached to any mast.
NOTE The type of gibbet used affects the layout of the antenna prior to erection.
Figure 1: Inverted V configuration using the mast gibbet
mast
gibbet
main mast
sm (in metres)
maximum signal
spacing (in metres)
guy rope
mm (in metres)
halyard
coaxial cable
stub mast
perimeter
Page 2 of 11 15-00463-901 Issue 1, September 2005
C463 Multiwire Broadband Dipole Antenna (2–30 MHz)
Figure 2: Inverted V configuration using the antenna gibbet
sm (in metres)
maximum signal
spacing (in metres)
guy rope
antenna
gibbet
coaxial cable
main mast
mm (in metres)
halyard
stub mast
Spacing and height
The spacing between the main mast and the stub masts in the inverted V configuration is
determined by the following equation:
Sp ac in g 1 196 m m sm–()
–+=
2
All spacings and heights of the main mast (mm) and stub masts (sm) are in metres.
For example, an installation using a main mast height of 10 m and stub masts of 3 m
requires a spacing of 13 m between masts. Therefore, the overall installation requires
26 m, plus allowances for guy ropes.
Orientation
For effective communications, the line of the antenna wires, and therefore the masts,
should be at right angles to the preferred direction of propagation.
15-00463-901 Issue 1, September 2005 Page 3 of 11
C463 Multiwire Broadband Dipole Antenna (2–30 MHz)
Guy ropes
If the masts are guyed, the guys should not be located beneath the antenna, so that they
do not interfere with the raising and lowering of the antenna. If metallic guys are used, it
is recommended these be broken up with ‘egg’ insulators at regular intervals to shorten
the effective wavelength of each wire, and thus reduce any degradation to the antenna
radiation pattern.
Attaching the antenna to the main mast
Figure 3: Support arrangement for the inverted V configuration
D-shackle
gibbet
pulley
halyard
U-clamp
thimble
balun
CAUTION Do not erect the main mast until the pulleys and halyard are in place.
To attach the antenna to the main mast:
D-shackle
1 If required, attach the antenna gibbet to the mast.
1 Attach a pulley using a D-shackle to the outer end of the gibbet, and another at a
point close to where the gibbet is attached to the main mast.
1 Position the pulleys so that a halyard can run from one pulley to the other, then down
the main mast.
1 Cut 2 × 3 m lengths of halyard from the main halyard.
These are used for tying the ends of the antenna to the stub masts.
1 Run the halyard from the base of the main mast to the top, through the pulleys and
back to the base again, then tie the two ends together.
1 Erect the main mast.
1 Do one of the following:
• If you are using the mast gibbet, lay the antenna outside the perimeter of any
guy ropes, on the same side as the gibbet (see Figure 1 on page 2).
• If you are using the antenna gibbet, lay the antenna within the guy ropes, on the
same side as the gibbet (see
Page 4 of 11 15-00463-901 Issue 1, September 2005
Figure 2 on page 3).
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