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Summary of Contents for Barrett 912
- Page 1 User Guide 912 Multi-wire Broadband Dipole Antenna 500W P/N BC91202 (27m) P/N BCM91202/6 © Barrett Communications...
- Page 2 9m away from the mast in order to secure the antenna ends. In this configuration 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).
- Page 3 Antenna Orientation The orientation of the antenna at the site is vitally important. In Horizontal configuration, 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. Horizontal Configuration 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.
- Page 4 Installation - Inverted V Take the antenna in its box to its installation point, below the hoisting halyard. 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. Remove balun and Inverted V mounting kit from box.
- Page 5 Connect the loops of the drop wires to either side of the balun along with the inverted V suspension yoke. Tighten nuts to finger tight only. Attach the suspension halyard to the suspension yoke and slowly raise the balun until the connecting wires have taken some weight.
- Page 6 Connect the coaxial cable to the UHF type connector at the bottom of the balun and fit the coax pigtail strain relief fitting (see below left). This is connected to the strain relief connection point. Carefully remove tape and cable ties and extend each section one at a time until extended to full length (see below right).
- Page 7 Installation - Horizontal Configuration Take the antenna in its box to its installation point, below the hoisting halyard. Carefully remove antenna from box and - with RESISTOR LOADS FACING DOWN - lay on ground. Ensure wires do not tangle. 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.
- Page 8 Connect the coaxial cable to the connector on the bottom of the balun and fit with pigtail coax strain relief fitting (see right). Hoist antenna to full height and secure. Note: the antenna will curve downward slightly when suspended. Insulated Wire Balun Strain Relief Connection Point Coax Cable...
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