⑦
MULTIMETER
P
R
(Reflected power from antenna), V
D
(FET drain voltage),
and I
D
(FET drain current) and ALC voltage are shown on the
scale as selected by
③
METER select switch.
Full scales are; P
R
:250 W, V
D
: 150 V, I
D
: 40 A, ALC: -10V.
⑧
ON AIR, FAN, I
D
, 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.
I
D
: Excessive
I
D
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 I
D
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.
Band
Band Change Mode
CI-V (example)
*YSU is displayed for
Yaesu radio, and KEN
for Kenwood’s.
Amp. Status
Heat Sink Temp.
⑨
LCD Panel
Displays modes of operation and protection circuit.
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