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Line 83: Telescopic masts consist of two or more concentric sections and come in two principal types: Pump-up masts are often used on vehicles and are raised to their full height pneumatically or hydraulically. They are usually only strong enough to support fairly small antennas., however recently masts up 100m have been fitted on to large arcticualted lorries allowing mobile broadcasting to the countryside Telescopic lattice masts are raised by means of a winch, which may be powered by hand or an electric motor. These tend to cater for greater heights and loads than the pump-up type. When retracted, the whole assembly can sometimes be lowered to a horizontal position by means of a second tiltover winch. This enables antennas to be fitted and adjusted at ground level before winching the mast up.

Radio masts and towers: Difference between revisions