NT-2000 REF Manual
User-Level Maintenance
6-2
6.3. Maintenance on The Active Antenna Unit
The ANT–2000 active antenna or an optional active antenna unit (e .g. ANT–900, all
consisting of a 1.2m fiberglass whip, a preamplifier housing and coaxial cabling),
requires maintenance at least once every six months:
1. Whip Section
・ Clean the surface with a piece of soft cloth moistened with neutral household
detergent, while checking for any sign of damage.
・ Check to be sure that the whip is tightly screwed into the socket on the
preamplifier case, and that the set screw (hex socket head type) is tightened.
・ Check to be sure that the knurled metallic base is free from damage or corrosion.
Corrosion may be removed with a piece of wood, and then coated with water–
proofing paint. A metallic tool can damage the surface and should not be used
2. Preamplifier Housing
・ Clean the surface with a piece of soft cloth moistened with neutral household
detergent, while checking for any sign of damage.
・ Check to be sure that the housing is securely screwed onto the pole (if installed
on a marine mount) or the mounting hardware is properly secured to the mast (if
user– or dockyard–supplied hardware is used)..
3. Cabling
・ Clean the exposed section with a soft cloth moistened with neutral household
detergent, while checking to be sure that the surface is free from any sign of
damage.
・ If the installation uses a double–ended female coaxial coupler for cable extension,
check to be sure that the jointed section is properly protected with self–bonding
taping and there is no sign of damage.
< WARNING >
THE CENTER CONDUCTOR OF THE COAXIAL CABLE IS AT +8VDC WHEN THE
EQUIPMENT IS SWITCHED ON. DO NOT SHORT THE CENTER CONDUCTOR
TO GROUND, OR DAMAGE TO THE INTERNAL POWER SUPPLY CIRCUIT CAN
RESULT.
6.4. Self–Diagnostic Tests
At least once every six months, conduct the self–diagnostic tests as per the procedure
described in paragraph 4.12, and consult your dealer/qualified service engineer for
advice if the result indication of any tested item shows “FAILED.”
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