C463 Multiwire Broadband Dipole Antenna (2–30 MHz)
Page 4 of 11
15-00463-901 Issue 1, September 2005
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
To attach the antenna to the main mast:
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
).
•
If you are using the antenna gibbet, lay the antenna within the guy ropes, on the
same side as the gibbet (see
CAUTION
Do not erect the main mast until the pulleys and halyard are in place.
D-shackle
pulley
halyard
U-clamp
thimble
D-shackle
gibbet
balun
