Interfacing To Other Linear Amplifiers - Yaesu FT-950 Operating Manual

I
NSTALLATION AND
ANT
DC IN
1 2
INPUT: DC 13.8 V
-TUNE
TO FROM ROT TUNER
LINEAR
GND
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.
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.
Page 14
I
NTERCONNECTIONS
I O
NTERFACING TO
Antenna Cable (Not Supplied)
22 A
-TUNE DMU
EXT
REC SPKR
PTT REM KEY
Linear Amplifier Connection Cable (T9207451: Option)
L A
THER INEAR MPLIFIERS
CAT
RF OUT RF IN
I N
MPORTANT 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.
Linear Amplifier Connection Cable ( T9207451 )
LINEA Jack ( Pin Number )
Wire Color
Orange
Yellow
Green
Red
White
Blue
Violet
Brown
Black
Gray
Light Blue
GND FUSE AC
E ALC
!
Color Code Information
1 +13.8 V
2 TX GND
3 GND
4 BAND DATA A
5 BAND DATA B
6 BAND DATA C
7 BAND DATA D
8 TX INH
9 EXT ALC IN
10 TX REQ IN
Case Shield
FT-950 O
PERATING
E RY
Function
M
ANUAL