Tokyo Hy-Power HL-2.5KFX Instruction Manual page 3

inserted at both ends of the remote control cable, ALC cable, coaxial jumper
cable, and antenna cables, as needed. Also, a common mode AC line filter (near
the AC outlet), and in-line low pass filters on the antenna coaxial cable, (as
necessary), are recommended.
2-7 The amplifier has fast acting sophisticated protection circuits controlled
by the latest microprocessor technology. Please note, however, any such actions
that cause the same fault to occur repeatedly, will lead to failure of the valuable
final power FET transistors. Also note that the full power CW (or carrier) drive
under the erroneous MANUAL BAND SET leads to the failure of the final power
FET's (See page 11, Section 7. Connection). In this sense, it is highly
recommended that the amplifier is connected to the radio with supplied Band
Data Cable.
2-8 Before checking inside the amplifier, be sure to wait a few minutes for
the high DC voltage to discharge (monitor Vd meter reading). The internal
potentiometers for RF power detector, protection circuits, FET bias voltage
circuit, etc., are precisely adjusted at the factory, and should not be altered.
Doing so, would require readjustment with precision measuring instruments.
2-9 The primary power transformer is factory pre-wired for AC 240 V
operation. (See page6, Section 5. AC Line Voltage) Be sure to verify your AC
line voltage before you plug the AC power cord into the outlet.
2-10 Before powering on the amplifier, be sure to connect a dummy load (50
ohms, 1.5 kW min.) or a well-adjusted antenna to the output terminal. Operating
without any load will cause extreme stress to the RF power FET's, although
protection circuits should work under critical conditions.
2-11 Required drive power is slightly less than 100 W to obtain the full 1.5 kW
output. Do not attempt to operate with excessive drive from a high power
transceiver. Transmitting high drive RF (over 100 W) into the amplifier will void
the warranty.
2-12 Keep the aluminum heat sink and air openings free from dust and
blockages. Periodic cleaning will prevent degraded cooling efficiency.
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