User's Manual

⑦MULTIMETER PR(Reflected power from antenna), VD (FET drain voltage),

and ID(FET drain current) and ALC voltage are shown on the

scale as selected by ③METER select switch.

Full scales are; PR:250 W, VD: 150 V, ID: 40 A, ALC: -10V.

⑧ON AIR, FAN, ID, PROT(LED)

ON AIR : Lights when the amplifier is in transmit(TX) mode.

FAN : Lights when cooling fan is running at high speed.

When the heat sink temperature reaches 40℃, cooling fan

speed will continuously increase to enhance cooling

capacity.

It runs at full speed when 65℃ is reached.

ID : Excessive ID Indicator (25 A). Depending on the band and

antenna situation, high drain current may flow into FET’s. If

25 A is exceeded, this LED flickers and/or lights to indicate

that high ID is being drawn (This light does not necessarily

mean a failure of the amplifier. However, if it lights too often,

or too long, it is possible the driver power should be reduced

and the antenna should be checked for SWR, to avoid

stress to the FET’s.).

PROT : Lights when protection circuit shuts down the amplifier.

Various protection circuits are built in such as Over-drive,

Band mis-set, high Ant-SWR, Over-temperature etc.

Detailed explanations will follow.

⑨LCD Panel Displays modes of operation and protection circuit.

Band

Band Change Mode

CI-V (example)

*YSU is displayed for

Yaesu radio, and KEN

for Kenwood’s.

Amp. Status Heat Sink Temp.