Thales DVOR 432, Техническое руководство

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DVOR 432
Installation Operation and Maintenance
2-10
Ed. 01.04
Install antenna 2 in the same way as antenna 1 and to the left of it (as seen from the middle antenna),
such that with a vertical pipe diameter of 127 mm the distance between the outer edge of pipe 1 and
the outer edge of pipe 2 is 720 mm(Fig. 2-12). This distance can be set anticlockwise fromantenna
to antenna using improved means (e.g. a wooden rod cut to size ).
NOTE: 720 mm is a standard dimension, which may vary somewhat in practice on account of
tolerance chains within the antenna ring and the vertical pipes. In such cases a positive
or negative deviation from the standard dimension of 720 mm will be measured between
antenna 50 and antenna 1. This dimension (deviation from 720 mm) should be divided
by 50, in order to calculate a new clearance. The vertical pipes are then readjusted with
a new wooden rod in a second procedure. Each vertical pipe adjusted must also be
aligned precisely using a spirit level.
The hooks (Fig. 2-13/5) on both sides of the antenna ring holding a layer of structural steel matting
should be adjusted as necessary in order to ensure that they are firmly secured. The hooks ensure
adequate electrical connection.
1 2 3
720 mm
1 Vertical pipe of antenna 2
2 Wooden rod
3 Vertical pipe of antenna 1
Fig. 2-12 Spacing of vertical pipes of sideband antenna
Careful, precise mechanical alignment of the antenna will considerably simplify the work of the comĆ
missioning engineer. A maximum deviation of 3 mm between antenna 50 and antenna 1 with respect
to the corrected standard dimension can be tolerated. A sideband antenna (with cover) should now
be mounted on each vertical pipe. At first, the lower section of the antenna domes should only be
fastened loosely to the vertical pipe using the 3 screws and the oblong holes (Fig. 2-13/6).
1 Antenna dome
2 Outer ring
3 Inner ring
4 Vertical pipe
5 Hook
6 Screws (3x)
1
2
3 4 5
6
Fig. 2-13 Antenna ring, single antenna and vertical pipe