Barrett 2081-02-01 User manual

Contents Overview
Small balun
2 x Kevlar core antenna wire, labelled
with frequency markers
2 x Large winders
2 x 10m Throwing cord
2 x Lead throw weights
10m RG-58 coax
(20m RG-213 P/N 2085-02-01)
Carry bag
(No carry bag P/N 2085-02-01)
Instruction sheet
The Rapid Deployment VHF Multiband Dipole Antenna is a tuned antenna
with frequency labels to indicate lengths for each band of operation. When
tuned to a band, the antenna covers the full 6.4MHz band spread, with VSWR
3:1 or better.
For operation, each side of the antenna is
unwound to the tuned length for the band
required. The antenna wires are placed in
notches in the winding handle, with the label
visible on the antenna side of the winder, and
the cross-wire joiner placed behind the notch
so that the wire will not pull through.
To ensure correct frequency tuning, the
remaining (excess) wire should remain neatly
bundled on the winding handle. A Velcro strip
is provided for this purpose.

For operation on the lowest frequency band, the antenna should be
completely unwound.
Two throwing cords are provided on a separate winder, and attach to the
antenna winders through loops in the handles. These cords can be used to
elevate the antenna. Ideally, the coaxial feeder cable should come away from
the antenna at a right angle to the radiating wires. Some deviation is
acceptable, but the coax should not run parallel to the antenna any closer than
2 metres. The antenna will handle 50W average/continuous transmit power.
The antenna can be used in a number of configurations, depending on
structures available for elevation, and the desired radiation polarisation.
Horizontal Dipole
The horizontal dipole has maximum gain on the broadsides of the antenna,
and reduced gain along the axis. The radiation will be horizontally polarised,
and channel gain will be reduced when communicating with stations with
vertical antennas (e.g. mobile/manpacks).

Vertical Dipole
Operation as a vertical dipole will generally provide best performance. Gain will
typically be 3 to 5 dBi, in an omnidirectional pattern. The radiation will be
vertically polarised, giving optimum performance when communicating with
vertical antennas such as used with vehicle mobiles, manpacks, and handheld
radios.
One throwing cord should be used to hoist the antenna up to a suitable non-
conducting mast or other fixture such as a tree. The other throwing cord should
be used to hold the antenna reasonably straight, so that the antenna reaches
its full tuned length. The coax feeder should come away from the antenna
before coming down to the ground.

Notes: