South Midlands Communications Group

WTM Winch Operated Mast Series

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

 

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.).

WTM Mounting

To give easy access for fitting and servicing antennas. Manufactured with galvanised steel construction with a winch incorporating safety device and galvanised steel wire rope. The mast carrier is also galvanised steel, pivoted at the top and complete with clamps. The mast can be easily removed from the carrier for use in other locations.

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.

Side Mounting Bracket

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.

© Hilomast LLC 2017