KVH Industries TracPhone FB250 Installation Manual page 31

Chapter 2: Installing the system
FB250 compact dome antenna mast length
The below table shows the values for an FB250 compact dome antenna mast
without stays or wires. Note that these values are only guidelines - always
consider the environment and characteristics of the ship before deciding on
the mast dimensions.
The mast mount kit interfaces to a 1½" tube (OD 48.3 mm - absolute maximum
OD 52 mm). Masts with larger diameters must be tapered and the upper part
of the tube (approximately 50 mm) must have a diameter of 1½".
OD
Thickness
(mm)
48.3 3.25
48.3 4.05
50 3.00
60.3 3.65
60.3 4.50
76.1 3.65
76.1 4.50
88.9 4.05
88.9 4.85
18
Wall
Weight
(kg/m)
(mm)
3.61
4.43
3.48
5.10
6.17
6.80
7.90
8.47
10.10
Placing the antenna
Inertia Max. free mast length
6 4
(X10 mm )
0.117
0.139
0.123
0.262
0.309
0.547
0.651
0.974
1.140
(steel), m
< 0.6
<0.8
< 1.0
< 1.1