LP HAL600 Atlantic, User Manual, Page: 3 / 23

B-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 MOSFET transistors.
B-8 Before checking into the amplifier, always disconnect the mains power
supply, with the power disconnected, press the power switch to "POWER" to
ON, be sure to wait a minute to allow the high voltage discharge DC , return
the switch to OFF.
The internal potentiometers for RF power detector, protection circuits,
MOSFET bias voltage circuit, etc., are precisely adjusted at the factory, and
should not be altered. Doing so, would require readjustment with precision
measuring instruments.
B-9 The primary power supply is for AC 230 V operation.
Be sure to verify your AC line voltage before you plug the AC power cord into
the outlet.
B-10 Before powering on the amplifier, be sure to connect a dummy load
(50 ohms, 1000 W min.) or a well-adjusted antenna to the output terminal.
Operating without any load will cause extreme stress to the RF power
MOSFET’s, although protection circuits should work under critical conditions.
B-11 Required drive power is slightly less than 20 W to obtain the full 600 W
output. Do not attempt to operate with excessive drive from a high power
transceiver. Transmitting high drive RF (over 60 W) into the amplifier will void
the warranty.
B-12 Keep the copper/aluminum heat sink and air openings free from dust
and blockages. Periodic cleaning will prevent degraded cooling efficiency.
B-13 For long continuous operation in RTTY/FM modes, it is recommended
you reduce the RF drive levels by 20% to 30% lower output than CW/SSB
modes.
B-14 To prevent damage to the precision electronic components, avoid
extreme physical shock to the amplifier. If factory service is required, the
amplifier must
be shipped using the original box and packaging materials.
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