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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.
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