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Antenna Vibration
The antenna is designed to meet the following operational vibration levels in any of
three perpendicular directions measured at the mounting base of the radome i.e. at
the flange of the mounting pole.
Random Vibration:
1.05 grms with the following spectral density
5-2 Hz............. . 2g
/Hz
2
Hz..........-3dB/octave
20-
Single Frequency Vibration:
5-10Hz with amplitude 2.54 mm
10-15Hz with amplitude 0.76mm
15-25Hz with amplitude 0.40mm
25-33Hz with amplitude 0.23mm
Note: Vibration levels in a typical installation are usually much less than the above
mentioned values. It is however the responsibility of the installer to verify, that the
cited levels are not exceeded in any mode of operation of the vessel. In case of
abnormal vibration, typically at a resonance frequency, measures must be taken in
order to displace the resonance frequency or to dampen the vibration amplitude.
The Antenna - Above Deck Unit (ADU)
23
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