AE–1800 Instruction Manual
Installation
7 . 2 . A n t e n n a
I n s ta l l a ti o n
The dimensions of the active antenna unit (
ANT–2000 M
) is given in Figure 7–2.. The
equipment does not support the use of a wire antenna. The receiver input is low
impedance and is not suitable for wire antenna connection.
7.2.1. Installation Site Requirements
For best results and a prolonged service life, the active antenna unit should be installed:
・
at a site free from continuous heavy shocks and vibrations,
・
away as much as possible from the feedpoint or radiating elements of HF/MF
communications antennas, radar scanners and INMARSAT antennas, and
・
away as much as possible from, and above, any metallic obstructions.
< WARNING >
LOCATING THE ACTIVE ANTENNA CLOSE TO THE FEED POINT OR
RADIATING ELEMENTS OF AN HF/MF TRANSMITTING ANTENNA CAN
DESTROY THE PREAMPLIFIER IN THE CYLINDRICAL HOUSING.
7.2.2. Precautions for Cabling
・
To minimize the effect of interference from other onboard electronics, the coaxial
cable from the antenna unit should not be run close to, and in parallel with, transmit
antenna feed lines, radar waveguides, echo sounder transducer cables, control cables,
power cables, etc. from such equipment. The same requirements apply to the routing
of the long wire antenna.
・
If the cable is extended with coaxial connectors ( e.g. PL–258/PL–259 pairs), be sure
to make the junctions waterproof using self–bonding tape or other appropriate
sealant.
< WARNING >
THE CENTER CONDUCTOR OF THE COAXIAL CABLE IS AT +8 VDC ( OR AT +12V
WITH THE SECOND OPERATING AT 4209.5 KHZ ) WITH THE EQUIPMENT
SWITCHED ON. DO NOT SHORT THE CENTER CONDUCTOR TO GROUND OR
DAMAGE TO THE INTERNAL CIRCUITRY CAN RESULT.
< C A U T I O N >
Water intrusion into the coax cable will electrically damage the cable, making
it impossible to use it as a feeder any longer. A serious drop in sensitivity will
result.
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