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2. Precaution
Note the followings to prevent the failure, and to achieve the best performance of the
HL-450B.
•
Check the maximum power handling capacity of the antenna. (Needs 400 W PEP
rating at least.) Check also the antenna SWR, and SWR should be lowered to 1.5 or
the vicinity by adjusting the element and/or the antenna system when SWR is too high.
•
Never Transmit with no antenna connected to ANT terminal.
•
Maximum drive power is 50 W. Never exceed this limit.
(If the transmission duty is far longer than the reception, reduce the drive power
accordingly.)
•
Use 50 Ω coaxial cable for all connections.
•
Keep the power supply voltage at DC 13.8 V (or within 12 to 14 V). Never connect to
higher DC voltage and AC 115 V line, or amp will be killed.
•
The amplifier is cooled by forced airflow. Several inches of clearance on the side and
the rear wall are necessary to allow for smooth air exhaust from the fan. Do not block
the air vents on the top cover.
Keep the amplifier out of direct sunlight, in a cool dry environment.
•
If strong physical shock is applied to the HL-450B, internal parts may be damaged.
Handle the amplifier carefully especially during transportation to avoid the direct shock
to be given.
2
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