Barrett 912 Manuale utente
User Guide
912 Multi-wire Broadband Dipole Antenna 500W
P/N BC91202 (27m)
P/N BCM91202/6
© Barrett Communications
2
PLEASE READ THIS MANUAL IN ITS ENTIRETY BEFORE ATTEMPTING INSTALLATION.
This kit contains the following:
1x Antenna Assembly
1x balun
1x Pigtail strain relief tting
1x coaxial cable
1x Inverted V mounting kit (1x yoke, 1x insulated cable)
Halyards and pulleys required to hoist and support the antenna are not supplied, however they can be purchased sepa-
rately from Barrett Communications (Halyard and Pulley Kit P/N BCA91201). It is recommended that the halyards used to
support the antenna be either UV stabilised dacron cord or wire rope and that pulleys be of stainless steel construction.
For a 10-15m mast with an antenna in inverted V conguration, rods or stakes should be inserted into the ground at least
9m away from the mast in order to secure the antenna ends. In this conguration the mast must also have an offset or
out-rigger bracket, at least 0.8 metres long, to hold the antenna away from the mast. Barrett can supply a offset bracket
and pulley system (BCA90200).
As with all antenna installations, ensure the antenna is as far from sources of electrical interference as possible and in a
position that makes it impossible for the antenna to come in contact with high voltage overhead mains wiring.
It is highly recommended that antennas be installed by suitably qualied personnel.
Horizontal Conguration
Inverted V Conguration
Introduction
Barrett 912 Multiwire broadbands
(500W) can be mounted using a
10-15m mast.
The required minimum distance
between the masts is 32 metres
for BC91202 (27m antenna).
Offset Bracket (BCA90200)
Compatible masts
12.7m Lattice Tower (P/N BC90216)
10m Mast with nylon guys (P/N BC90205/FR/PR)
10m Mast with stainless steel guys (P/N BC902906/FR/PR)
3
Horizontal Conguration
Inverted V Conguration
Antenna Orientation
The orientation of the antenna at the site is vitally important.
In Horizontal conguration, the radiation is broadside to the antenna i.e. if transmissions need to travel in a predomi-
nantly North-South direction, the antenna should be set up with the ends pointing East-West.
N
N
For Inverted V, the antenna becomes more suitable for NVIS, with radiation being directed at high angles, but omnidirec-
tional around the antenna on a horizontal plane.
4
Installation - Inverted V
1. Take the antenna in its box to its installation point, below the hoisting halyard.
2. Carefully remove antenna from box and - with RESISTOR LOADS FACING DOWN - lay on ground. Ensure wires do
not tangle. DO NOT REMOVE TAPE OR CABLE TIES.
3. Remove balun and Inverted V mounting kit from box.
4. Locate the ‘drop wires’. These will be under the
antenna.
5. Locate the ‘eye loop’ in the centre of the drop wire
and determine to which half of the antenna it is con-
nected.
6. Pull the loop along the ground so that it clears the spreader rods and coiled wires and loop the cable over the ends
of the antenna until it is vertical.
7. Repeat for the other side.
Eye loop
5
8. Connect the loops of the drop wires to either side of the balun along with the inverted V suspension yoke. Tighten nuts
to nger tight only.
9. Attach the suspension halyard to the suspension yoke and slowly raise the balun until the connecting wires have taken
some weight.
10. Further tighten the nuts on the balun.
11. Replace the insulated wire (connected to one of the load resistor pairs) with the longer insulated wire from the Inverted
V mounting kit and connect it to the top of the balun ensuring that it passes between the vertical cables (see below).
6
1. Connect the coaxial cable to the UHF type connector at the bottom of the balun and t the coax pigtail strain relief
tting (see below left). This is connected to the strain relief connection point.
2. Carefully remove tape and cable ties and extend each section one at a time until extended to full length (see below
right). Ensure that tangles are avoided.
3. Carefully hoist antenna to full height.
4. Attach appropriate cord to the insulator at each end of the antenna. Tie these cords to convenient points to secure
the antenna in position. These should ideally be tied at a height, or in a safe area, to avert possible contact and risks
of minor shocks or burns.
1
2
3
4
5
6
1Suspension Yoke Eye Loop
2
Suspension Yoke
3Balun
4
Strain Relief Connection Point
5Insulated Wire
6
Coax Cable
7Coax Pigtail Fitting
7
7
Installation - Horizontal Conguration
1. Take the antenna in its box to its installation point, below the hoisting halyard.
2. Carefully remove antenna from box and - with RESISTOR LOADS FACING DOWN - lay on ground. Ensure wires do
not tangle.
3. Carefully remove tape and cable ties and extend each section one at a time until extended to full length (see below).
Ensure that tangles are avoided.
4. Attach ends of antenna to hoisting halyards and hoist until antenna is at a workable height off the ground. Note that
the drop wires should be hanging below the hoisted antenna.
5. Attach the drop wire loops to the sides of the balun and the insulated wire (connected to the insulators) to the top of
the balun, as shown below.
8
1. Connect the coaxial cable to the connector on the bottom of the
balun and t with pigtail coax strain relief tting (see right).
2. Hoist antenna to full height and secure. Note: the antenna will
curve downward slightly when suspended.
1
Insulated Wire
2Balun
3
Strain Relief Connection Point
4
Coax Cable
5
Pigtail Coax Strain Relief Fitting
1
2
3
4
5
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