User's Manual

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”.
 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.