Operation Manual

Page 14
F
T
DX
30
00 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 control line from the “TX GND OUT” line
at the
LINEAR
jack.

The specied range for ALC voltage to be used with
the
FT
DX
3000
is 0 to -4 Volts DC.

Amplier systems utilizing different ALC voltages
will not work correctly with the
FT
DX
3000
, and
their ALC lines must not be connected if this is the
case.
iMportAnt note!

Do not exceed the maximum voltage or current rat-
ings for the “TX GND OUT” pin (pin 2) of the
LIN-
EAR
jack. This line is not compatible with negative
DC voltages, or AC voltages of any magnitude.

Most amplifier control relay systems require only
low DC voltage/current switching capability (typi-
cally, +12V DC at 25 ~ 75 mA), and the switching
transistor in the
FT
DX
3000
will easily accommodate
such ampliers.
Note
When the
FC-40
is connected to the
FT
DX
3000
,
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.
GND
EXT ALC
TX GND