Site considerations
98-175666-C
Chapter 2: Installation
2-10
(valid design) whereas a thinner wall thickness yields a more weak structure (not valid
design).
Mast length (S1000 antenna)
The below tables show the minimum dimensions for a SAILOR XTR GX-R2 ADU (S1000 )
mast with and without stays/braces. Note that the values are only guidelines - always
consider the environment and characteristics of the ship before deciding on the mast
dimensions.
Figure 2-11: Free mast length and bracing for a tall mast
Note
Make sure that there is free space below the drain tube.
Note
The tables list the values for
steel masts
. For
aluminium masts
, the
free mast length is reduced to 75% of the values for steel.
Note
Bracing and rigid masts can still not prevent vertical vibration if the
mast is attached to a deck plate that is not rigid. Make every effort to
mount the mast on a surface that is well supported by ribs. If this is
not possible, provide extra deck plate propping.
Free m
ast length (m)
Mast without
braces
Max. free mast
length (steel),
(m)
Outer
diameter
(mm)
Wall
thickness
(mm)
Weight
(kg/m)
0.4
a
a. The height of 0.4 m is not recommended to be used as it will make access through the
ADUʼs service hatch difficult.
200
5
24.0
0.6
220
5
26.5
0.8
250
5
30.2
1
270
5
32.7
Table 2-3: Mast dimensions without braces (S1000)