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Page 14 FT-950 OPERATING MANUAL
INSTALLATION AND INTERCONNECTIONS
INTERFACING TO OTHER LINEAR AMPLIFIERS
NOTE
The TX GND OUT pin (pin 2) of the LINEAR jack is
a transistor “open collector” circuit. It is capable of
handling positive relay coil voltages up to +60VDC at
200 mA or +30 VDC at 1 A. If you plan to use multiple
linear amplifiers for different bands, you must provide
external band switching of the “Linear Tx” relay con-
trol line from the “TX GND OUT” line at the LIN-
EAR jack.
The specified range for ALC voltage to be used with
the FT-950 is 0 to -4 Volts DC.
Amplifier systems utilizing different ALC voltages will
not work correctly with the FT-950, and their ALC
lines must not be connected if this is the case.
IMPORTANT NOTE!
Do not exceed the maximum voltage or current ratings
for the “TX GND OUT” pin (pin 2) of the LINEAR
jack. This line is not compatible with negative DC volt-
ages, or AC voltages of any magnitude.
Most amplifier control relay systems require only low
DC voltage/current switching capability (typically,
+12V DC at 25 ~ 75 mA), and the switching transistor
in the FT-950 will easily accommodate such amplifi-
ers.
Wire Color
Orange
Yellow
Green
Red
White
Blue
Violet
Brown
Black
Gray
Light Blue
LINEA Jack
(
Pin Number
)
1
2
3
4
5
6
7
8
9
10
Case
Function
+13.8 V
TX GND
GND
BAND DATA A
BAND DATA B
BAND DATA C
BAND DATA D
TX INH
EXT ALC IN
TX REQ IN
Shield
Linear Amplifier Connection Cable
(
T9207451
)
Color Code Information
TO
1
ANT
DC IN
2
FROM
GND
ROT
LINEAR
TUNER
PTT
REC
REM KEY
DMU CAT
EXT
SPKR
INPU T: DC 13.8 V
22 A
-TUN E
-TUN E
EERYALC
ACFUSEGND
RF INRF OUT
A
N
T
1
A
N
T
2
A
N
T
H
F
A
n
t
e
n
n
a
5
0
M
H
z
A
n
t
e
n
n
a
I
N
P
U
T
G
N
D
G
N
D
I
N
P
U
T
D
C
1
3
.
8
V
Antenna Cable (Not Supplied)
L
I
N
E
A
R
L
i
g
h
t
-
B
l
u
e
Linear Amplifier Connection Cable (T9207451: Option)
B
l
a
c
k
G
r
e
e
n
Y
e
l
l
o
w
Note
When the FC-40 is connected to the FT-950, TX
GND (pin 2) of the TUNER jack and the LINEAR
jack (pin 2) are common circuits.
Therefore, the maximum voltage at TX GND (pin
2) of the LINEAR jack must not exceed +5V.
16


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