15
• Interfacing to Other Linear Amplifiers
•
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.
• When using multiple linear amplifiers for different bands, you must provide external band switching of the
“Linear Tx” relay control line from the “TX GND OUT” line at the LINEAR jack.
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 voltages, or AC voltages of any magnitude.
ANT 1
ANT 2
EXT SPKR
KEY
ACC
TUNER
PTT
METER
GND
LINEAR
+13.8V
REM
EXT ALC
RS-232C
A
B
DC IN
LINEAR
D-sub 15 pin
HF/50 MHz Antenna
Antenna Cable (50 ohms)
GND
GND
RF OUT
RF IN
GND
EXT ALC
TX GND
ANT 1
The figure above shows the FTDX101MP rear panel connections to other linear amplifiers.
ANT 1
ANT 2
EXT SPKR
KEY
ACC
TUNER
PTT
METER
GND
LINEAR
+13.8V
REM
EXT ALC
RS-232C
A
B
EXT ALC
DC IN
GND
GND
TX GND
Coaxial Cable (50 ohm)
HF/50 MHz Antenna
RF OUT
RF IN
ANT 1
The figure above shows the FTDX101MP rear panel connections to other linear amplifiers.