Rear Panel Jacks - Yaesu FT-450 Operation Manual

R P
EAR ANEL
DC IN Jack
This is the DC power supply
connection for the transceiver.
Use the supplied DC cable to
connect directly to the car bat-
tery or to a DC power supply,
which must be capable of sup-
plying at least 22 A @13.8
VDC.
DATA
DATA Jack
This 6-pin input/output jack provides receiver audio and squelch sig-
nals, and accepts transmit (AFSK) audio and PTT control, from an
external packet TNC.
Page 8
J
ACKS
-
+
(viewed from rear panel)
ANT
INPUT
DC 13.8V
22A
TUNER LINEAR CAT
EXT SPKR Jack
This 3.5-mm, 2-pin jack provides variable audio output for an external
speaker. The audio output impedance at this jack is 4 - 16 Ohms and
the level varies according to the setting of the front panel's [ AF GAIN ]
knob. Inserting a plug into this jack disables the internal loudspeaker.
CAT Jack
This 9-pin serial DB-9 jack allows ex-
ternal computer control of the FT-
450. Connect a (straight) serial cable
here and to the RS-232C COM port
on your personal computer (no ex-
ternal interface is required).
LINEAR Jack
This 10-pin output jack pro-
vides band selection data,
which may be used for control
of the optional VL-1000 Solid-
State Linear Amplifier.
TUNER Jack
This 8-pin jack is used for Connection to
the FC-30 or FC-40 External Automatic
Antenna Tuner.
ANT Jack
Connect your antenna here, using a type-M (PL-259) co-
axial connector and 50 Ohm coaxial feedline.
Warning!: High Power RF voltage is present at the TX RF
section of the transceiver while transmitting. Absolutely!
Do not touch the TX RF section while transmitting.
COOLING FAN
Turns at low speed in receive mode.
Turns at high speed when the temperature begins to
rise or in transmit mode.
EXT
GND
SPKR
GND Terminal
For safety and optimum performance, use this termi-
nal to connect the transceiver to a good earth ground.
Use a large diameter, short braided cable for making
ground connections. Refer to page 12 for other notes
about proper grounding.
“CTS
”N/A
GND
 Connect to Œ ‘
ŽSERIAL IN
(viewed from rear panel)
TX GND OUT
Œ+13.8V OUT
BAND DATA-A (LSB)
“TX INH IN
BAND DATA-B
”EXT ALC IN
Œ +13.8V OUT  TX GND OUT
Ž GND
‘ TUNER SENSE
’ RESET OUT
ΠDATA IN
Ž DATA PTT
DATA OUT
(viewed from rear panel)
FT-450 O
’RTS
‘ Connect to Œ 
ŒConnect to  ‘
SERIAL OUT
ŽGND
’BAND DATA-D (MSB)
•TXREG IN
‘BAND DATA-C
(viewed from rear panel)
 RXD
 TXD
“ TX INH IN
(viewed from rear panel)
 GND
 FSK IN
‘SQL OUT
M