WTM/1 and WTM/2
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 14 ft and element length of 27 ft giving wind loads of 100 Ibs at 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 29 ft. It will safely support a 2 ft diameter dish at a wind speed of 100 mph or a 3 ft diameter dish at a wind speed of 62 mph. It has a retracted length of only 9.78 ft making it ideally suitable for fitting to the rear of telecommunications vehicles. A 6.5 ft 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 | Height Extended | Height Retracted | Number Of Sections | Diameter Of Top Section | Vertical Headload | Max. Wind Speed Unguyed | Basic Weight Of Mast |
| (ft) | (ft) | (inches) | (lbs) | (mph) | (lbs) | ||
| WTM/1 | 43 | 17.62 | 3 | 4 | 110 | 80 | 176 |
| WTM/2 | 57 | 18 | 4 | 2.9 | 99 | 59 | 202 |
| WTM/3 | 70 | 18.46 | 5 | 1.9 | 44 | 49 | 224 |
| WTM/4 | 29 | 9.78 | 4 | 2.9 | 121 | 99 | 136 |
The unit is supplied complete with foundation bolts and bolt setting template. The size of the foundation block is 3.9 ft square x 2.3 ft deep. The tilt-over mechanism is also suitable for reinforced flat roofs on airport buildings, radio stations etc. Weight 242.5 lbs. (Not suitable for WTM/4).
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.
WTM Extension Tubes
This tube is 2". dia. and extends the mast height by 6'12" ft.
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 10.2". between the centre of the mast and the mounting face. (Hole centres are 1.5ft. apart for M12 bolts). These brackets are not designed to support the weight of the mast which should stand on its base.
Electric Winch
This electric winch is driven by a robust 12v DC motor with limit switches set to automatically operate at the desired minimum and maximum mast heights.
When connected to a standard 12v vehicle battery it takes approx 6 mins to fully extend the tallest mast in the series.
There is a two button control for up/down operation, which stops when the button is released. This winch can also be operated manually with the handle provided, in the event of a power failure. The spooled drum prevents the wire rope from bunching and ensures smooth and controlled operation.
The winch is weather protected to Standard IP54