FDANT, Half Wave Folded Dipole Aerial for external use. Requires Feeder and Clamp

FDANT, Half Wave Folded Dipole Aerial for external use. Requires Feeder and Clamp

The FDANT is a well designed and constructed half wave folded dipole aerial with BALUN matching for use with all SCOPE UHF paging systems. It is capable of providing excellent coverage of very large sites provided it is sited and installed correctly.

Scope transmitters operate on UHF frequencies which incur high power losses in the antenna feeder cable. Always use quality 50 OHM coaxial cable. RG58 is only acceptable on cable runs of up to 5 metres. We recommend RG213 or better on greater lengths up to about 15 metres. Longer runs should be avoided if possible. Use only high quality solder-fit connectors. Pre-terminated feeder cable in 5, 10 and 15 metre lengths are available from SCOPE.

• When installed, the drain hole on the antenna element must face downward
• Ensure that the connection from the aerial to the feeder cable is sealed correctly (see below for details) and
• that the feeder cable is adequately clamped along the entire run. DO NOT COIL EXCESS CABLE.
• The aerial can be supplied with either a wall mounting bracket or pole mounting clamp. If using the wall bracket, ensure that the aerial is mounted on a vertical wall facing the primary coverage area and away from any metal objects.
• If a more omni-directional coverage is required, either mount the aerial at the top of a building with the upper part of the radiator above roof level, or mount on a vertical pole above roof height using the pole mount clamp.
• For propagation throughout a large multi-storey building, the best coverage is often achieved by either mounting the aerial in a riser, or mounting it outside the building at half the building height.
• Where penetration of buildings is required as opposed to maximum range, increasing the aerial height could be counter productive. In these circumstances, lowering the aerial may be the best solution, assisting signal penetration through windows and doors etc.
• UHF signals do not travel well over hills but they will bounce off obstructions and in many cases the signal will be received by reflection rather than by direct path.
• Watch out for hazards to transmission: Foil backed plasterboard, metal clad buildings, chain link and chicken wire fencing all act as screens to radio waves, severely limiting the range.

For more details, please refer with our attached datasheet.