HILLS FB180A 6m Telomast, Galvanised Steel Roof Mast Instruction Manual

HILLS FB180A 6m Telomast, Galvanised Steel Roof Mast

Warning: Telomast installation should not be undertaken by inexperienced persons. It is recommended that the mast be installed by a suitably qualified tradesperson. Safety precautions should be observed, including Working at Heights and the use of PPE. Beware of
overhead electric cables. Local government authorities may require the submission of an application for building approval and/or a Safe Work Method Statement (SWMS) before installation can commence.

1.  Select the site. For installation on a level surface, the staying diagram (fig 1) indicates the space required. For installation on pitched roofs, special guy lengths and loading conditions will apply. The base and guy anchor points must be capable of supporting the design loads from the mast. For standard installations the base and guy anchor loads are specified in table 2. Foot mounts are available for sloping (fig 2A) and level (fig 2B) surfaces.

2. Securely install the foot mount or base plate to the mast base fixing point. Attach turnbuckles to all guy anchor points. Note: to avoid possible over-stressing of the mast structure, it is important that the guy anchors be located no closer to the mast base than specified in figure 1.

3. Remove shipping pin (fig 3) from bottom of mast and the small screw from the top lock rings. Slide the top guy support and the top guy plate off the mast and replace them in opposite order. Screw the lock screws (from the accessory bag) into the lock rings, making sure that the lock screw just protrudes into the top hole in each mast section, except the top section which will have its lock ring tightened 300mm below antenna position (fig 4). Install thimbles in the guy plates and  attach the guy wires with wire rope grips. Three wire rope grips should be used at each end of the guy wire. Fit the bridge of the wire rope grip to the loaded part of the rope (fig 7).

4. Stand mast in foot mount or base plate. Attach bottom set of guy wires to turnbuckles on anchors. Tighten and check for vertical with spirit level (fig 5).

5. Using an elevated work platform, attach antenna and feeder cable and line up the guy plates so that all fittings are facing in the same direction.

6. Extend top section of mast until stop is reached and tighten lock screw to hold it there. Extend next section of mast a few inches until the holes for the retaining pins are visible, clamp with lock screw, and insert the two retaining pins. Release lock screw holding the top section and allow it to drop down onto the retaining pins, then turn it until the notches engage on the pins (fig 6). Retighten the lock screw. Continue as above until mast is fully extended.

7. Attach the guy wires at the correct anchor points, but do not tighten fully. Turn the mast until antenna gives best results, and then tighten all guy wires evenly, ensuring that the mast remains straight and vertical. Guy pretension is to be 10% of the specified guy minimum breaking force. For the recommended 7/0.90 G380 guying strand, pretension is to be 140N. Pretension may be checked by attaching the lifting hook of a suitable spring balance to the lower guy thimble and applying sufficient force to pull the lower guy thimble out of contact with the lower anchor. For added security, wire turnbuckles to each other (fig 7).

Telomast Maximum Design Loads
Hills Telomast has been designed to conform to the requirements of the relevant Australian Standards:

AS 1170.1 1989 SAA Loading Code Part 1: Dead and live loads and load combinations
AS 1170.2-1989 SAA Loading Code Part 2: Wind loads

AS 4055-1992 Wind loads for housing
AS 4100-1990 Steel structures
AS/NZ 4600-1996 Cold-formed steel structures

Rationalized gust wind speeds have been used to simplify the determination of the maximum allowable head loads (antenna projected wind area and weight). Calculating the projected area of an antenna facing into the wind requires thinking of the three-dimensional shape as a two-dimensional surface.
The Projected Area of an antenna is calculated on the wind direction impacting the front of the antenna surface.
Maximum Permissible Head Loading  for wind classifications up to W41: Maximum antenna Cd * Area† 0.30 m2

Table 2. Worst case ultimate limit state loads at mast base and guy anchor points resulting from maximum permissible head loading  is the responsibility of the installer to ensure that any structure to which the Telomast is fixed, as well as the fixing devices, are capable of supporting the design loads. The maximum ultimate limit state loads at the mast base and guy anchor points for the worst case loading situation are shown in the table above. The loadings are applicable to three and four way guying arrangements.

Available From
National Phone: 1300 601 915
Email: orders@bitek.com.au
Bitek Pty Ltd
11 Sheppard Street
Hume
ACT 2620
Ph : 02 6260 1874
Bitek (Syd) Pty Ltd
Unit 7, 463 Victoria Street
Wetherill Park
NSW 2164
Ph : 02 9659 2272
Bitek (Vic) Pty Ltd
7/1 Culverlands St
West heidelberg
VIC 3081
Ph: 03 9456 9222
Bitek (SA) Pty Ltd
1 Temple Court
Ottoway
SA 5013
Ph: 08 8395 4111

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