Sea Tel 9497B-21, Инструкция по установке и эксплуатации

Страница: 20 / 104

Installation 9497B-21 C/Ku-Band TVRO
4-2
4.2. Site Selection Aboard Ship
The radome assembly should be installed at a location aboard ship where:
•
The antenna has a clear line-of-sight to view as much of the sky (horizon to zenith at all bearings) as is practical.
•
X-Band (3cm) Navigational Radars:
•
The ADE should be mounted more than 0.6 meters/2 feet from 2kW (24 km) radars
•
The ADE should be mounted more than 2 meters/8 feet from 10kW (72 km) radars
•
The ADE should be mounted more than 4 meters/12 feet from 160kW (250km) radars
•
S-Band (10cm) Navigational Radars:
•
If the ADE is/has C-Band it should be mounted more than 4 meters/12 feet from the S-band Radar.
•
The ADE should not be mounted on the same plane as the ship's Radar, so that it is not directly in the Radar beam
path.
•
The ADE should be mounted more than 2.5 meters/8 feet from any high power MF/HF antennas (<400W).
•
The ADE should be mounted more than 4 meters/12 feet from any high power MF/HF antennas (1000W).
•
The ADE should also be mounted more than 4 meters/12 feet from any short range (VHF/UHF) antennae.
•
The ADE should be mounted more than 2.5 meters/8 feet away from any L-band satellite antenna.
•
The ADE should be mounted more than 3 meters/10 feet away from any magnetic compass installations.
•
The ADE should be mounted more than 2.5 meters/8 feet away from any GPS receiver antennae.
•
Another consideration for any satellite antenna mounting is multi-path signals (reflection of the satellite signal off
of nearby surfaces arriving out of phase with the direct signal from the satellite) to the antenna. This is
particularly a problem for the onboard GPS, and/or the GPS based Satellite Compass.
•
The Above Decks Equipment (ADE) and the Below Decks Equipment (BDE) should be positioned as close to one
another as possible. This is necessary to reduce the losses associated with long cable runs.
•
This mounting platform must also be robust enough to withstand the forces exerted by full rated wind load on the
radome.
•
The mounting location is robust enough that it will not flex or sway in ships motion and be sufficiently well re-
enforced to prevent flex and vibration forces from being exerted on the antenna and radome.
•
If the radome is to be mounted on a raised pedestal, it MUST have adequate size, wall thickness and gussets to
prevent flexing or swaying in ships motion. In simple terms it must be robust.
If these conditions cannot be entirely satisfied, the site selection will inevitably be a “best” compromise between the
various considerations.
4.3. Preparing For The Installation
4.3.1.
Exercise caution when unpacking the equipment.
Unpack Shipping Crates
4.3.2.
Carefully inspect the radome panel surfaces for evidence of shipping damage. Inspect the pedestal assembly
and reflector for signs of shipping damage.
Inspect / Inventory
4.3.3.
Prepare the mounting location for the Radome. If the radome is to be bolted to the deck (or a platform)
assure that the mounting holes have been drilled. Assure that the mounting hardware has obtained and is
readily available.
Prepare ADE Mounting Location
4.3.4.
Prepare the mounting location for the Below Decks Equipment. These equipments would normally be
installed in a standard 19” equipment rack. Refer to the Antenna Control Unit manual for installation of the
ACU and the Terminal Mounting Strip.
Preparing BDE Location
Refer to the vendor supplied manuals for installation of the other below decks equipments.