WTM Winch Operated Mast
WTM.1 and WTM2
These masts will support large 3 element antennas providing that the maximum operating heights specified in this table are not exceeded. The figures are for a typical antenna with a boom length of 4.3 metres (14 ft) and element length of 8.2 metres (27 ft) giving wind loads of 45kgs (100 Ibs) at 36m/sec (80mph).
WTM 3
This mast is intended for smaller antennas where maximum height is of prime importance. It is particularly useful for experimental work and field strength measurement. However, if under extremely windy conditions the operating heights are reduced to those shown in the above table it will withstand the same wind loading as the WTM/2 mast.
WTM.4
This mast has been developed to withstand high head loads at heights of up to 9 metres. It will safely support a 0.6rn (2 ft) diameter dish at a wind speed of 160 kph or a 1.Om (3 ft) diameter dish at a wind speed of 100 kph. It has a retracted length of only 2.98m (9.78 ft) making it ideally suitable for fitting to the rear of telecommunications vehicles. A 2.0 metre extension is available if required.
Due to the wide variety of applications and methods of mounting, the masts are manufactured as basic units. It is, therefore necessary when ordering to specify the type of mast, type of winch, mounting arrangement and accessories required.
| Mast | WTM1 | WTM2 | WTM3 |
| Height Extended (Meters) | 13 | 17 | 21 |
| Height Retracted (Meters) | 5.37 | 5.48 | 5.63 |
| Number of Sections | 3 | 4 | 5 |
| Diameter of Top Section (mm) | 102 | 76 | 50 |
| Vertical Headload(Kgs) | 50 | 45 | 20 |
| Max Wind Speed Unguyed (Kph) | 130 | 96 | 80 |
| Horizontal Headload | 23 | 16 | 10 |
| Top Guy Ref. Number | - | - | - |
| Basic Weight of Mast (Kgs) | 80 | 92 | 102 |
Tilt Over Mechanism
- Easy access for fitting and servicing antennas
- Galvanised steel construction
- Mast easily removed for use with other applicatons
- Supplied with foundation bolts and bolt setting template
- Foundation block: 1.2m square x 0.75m deep
- Weight 110kgs.
- Not suitable for WTM/4
Side Mounting Brackets
For mounting masts to vertical surfaces of vehicles or buildings. Comprising two aluminium alloy castings, giving full protection to the mast tube, bolted to galvanised steel bars formed to give a distance of 260mm. Between the centre of the mast and the mounting face. (Hole centres are 460mm. apart for M 12 bolts). These brackets are not designed to support the weight of the mast which should stand on its base.
Electric Winch
- Robust 12v DC motor
- Approx 6 mins to extend (12v vehicle battery)
- Two button control for up/down operation
- Optional manual operation with provided handle
- Weather protected to Standard IP54
Field Base Guy Assembly
Comprising: special collar, 3 galvanised steel wire guys with adjusting screws, ground stakes, ground pegs and base plate. Can be set in concrete for permanent sites.
Extension Tubes
WTM/1
This tube is 76mm. dia. and extends the mast height by 4m. (13'/2ft.). The wind loadings must be reduced to those for the WTM/2 mast.
WTM/4
This tube is 5l mm. dia. and extends the mast height by 2m. (6'12 ft.).
