Interfacing To Other Linear Amplifiers - Yaesu FT DX 3000 Operating Manual

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nsTallaTiOn anD
i
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 control line from the "TX GND OUT" line
at the LINEAR jack.
 The specified range for ALC voltage to be used with
the FT 3000 is 0 to -4 Volts DC.
DX
 Amplifier systems utilizing different ALC voltages
will not work correctly with the FT
their ALC lines must not be connected if this is the
case.
Note
When the FC-40 is connected to the FT
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.
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i
nTercOnnecTiOns
o
nterFAcing to
3000, and
DX
3000,
DX
l A
ther ineAr MpliFierS
i n !
MportAnt ote
 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
such amplifiers.
F T
DX
GND
EXT ALC
TX GND
3000 will easily accommodate
DX
30 00 O M
peraTing anual