Tokyo Hy-Power HL-450B Instruction Manual

INSTRUCTION MANUAL

MODEL : HL-450B

SOLID STATE HF BAND 400W

LINEAR AMPLIFIER

Thank you for purchasing the Tokyo Hy-Power HF band 400W linear amplifier model
HL-450B.
The HL-450B is a solid state linear amplifier having maximum output of 400 W (PEP) on HF
band, making full use of the latest semiconductor circuit technology.
It is best suited for the mobile operation as well as the base station work combining with the
optional DC power supply, HP-450.
Read this instruction manual thoroughly first so that you may work the amplifier properly.

1. Features

The HL-450B has a built-in auto band-select function. It uses a newly developed micro
processor based technology, and works a smooth automatic operation when driven by
the radio. In addition, manual band setting is possible as well. It is designed to be “user
friendly”.

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Since the HL-450B is compatible with our optional external remote controller (HRC-60),
operation is possible from remote locations, if plugged into the socket at the rear panel.

The HL-450B is equipped with a hard-key terminal to make a smooth send/receive
switching with the radio, and also an output terminal for ALC circuit which controls the
output of the radio. ALC helps suppress excessive output and avoid the signal
distortion.

The HL-450B has various protection circuits such as for high antenna SWR, over drive,

over current etc.
When any abnormal condition is detected, operation is automatically shut down to
prevent the failure.

The large analog power meter is easy to read and the output can always be monitored.

The HL-450B is designed to comply with the new FCC rule of Part 97, issued in

December 2006.

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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.

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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.

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