Page 14
FT-950 O
PERATING
M
ANUAL
I
NSTALLATION
AND
I
NTERCONNECTIONS
I
NTERFACING
TO
O
THER
L
INEAR
A
MPLIFIERS
N
OTE
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.
I
MPORTANT
N
OTE
!
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
INPUT: DC 13.8 V
22 A
-TUNE
-TUNE
E
E
RY
ALC
AC
FUSE
GND
RF IN
RF OUT
A
N
T
1
A
N
T
2
A
N
T
H
F
A
n
te
n
n
a
50
M
H
z
A
n
te
n
n
a
IN
P
U
T
G
N
D
G
N
D
IN
P
U
T
D
C
1
3
.8
V
Antenna Cable (Not Supplied)
L
IN
E
A
R
L
ig
h
t-
B
lu
e
Linear Amplifier Connection Cable (T9207451: Option)
B
la
ck
G
re
e
n
Y
e
llo
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 5V.