32 FT-857 Operating Manual
INPUT Jack
This is the DC power supply connection for the transceiver. Use the supplied DC cable
to connect this jack to the car battery or DC power supply,
which must be capable of supplying at least 22 Amps @
13.8 VDC. Make certain that the Red lead connects to the
Positive (+) side of the power source, and that the Black
lead connects to the Negative (–) side of the power source.
This Jack also provides an Transmit Power Control terminal. If you connect pin-3 (BATT
SENS) of the DC power jack to the ground, the FT-857 automatically switches to 20
Watts (430 MHz: 10 Watts) of output power.
CAT /LINEAR Jack
This 8-pin mini-DIN jack is used for connection to the FC-30 External Automatic An-
tenna Tuner. It is also used for inter-
facing to a personal computer for
control of the transceiver using the
CAT system, and for interconnec-
tion to the VL-1000 Linear Ampli-
fier.
REAR PANEL CONNECTORS
+13.8V
BAND DATA
TX INH
RX D
TX D
TX GND
GND
TX INH
BAND B
BAND A
TX GND
GND
BATT SENS
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