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Page 14 FT
DX
1200 OPERATING MANUAL
INSTALLATION AND INTERCONNECTIONS
INTERFACING TO OTHER LINEAR AMPLIFIERS
NOTE
The T; G1' 2UT pin pin ) of the
LINEAR
jack
is a transistor “open collector” circuit. It is capable of
handling positive relay coil voltages up to 30 V'C
at 00 m$. If you plan to use multiple linear ampli-
¿ers for different bands, you must provide external
band switching of the “Linear Tx” relay control line
from the “T; G1' 2UT” line at the
LINEAR
jack.
The speci¿ed range for $LC voltage to be used with
the
FT
DX
1200
is 0 to -4 Volts 'C.
$mpli¿er systems utili]ing different $LC voltages
will not work correctly with the
FT
DX
1200
, and
their $LC lines must not be connected if this is the
case.
IMPORTANT NOTE!
'o not exceed the maximum voltage or current rat-
ings for the “T; G1' 2UT” pin pin ) of the
LIN-
EAR
jack. This line is not compatible with negative
'C voltages, or $C voltages of any magnitude.
0ost amplifier control relay systems reTuire only
low 'C voltagecurrent switching capability typi-
cally, 1V 'C at  a 7 m$), and the switching
transistor in the
FT
DX
1200
will easily accommodate
such ampli¿ers.
Note
When the
FC-40
is connected to the
FT
DX
1200
,
T; G1' pin ) of the
TUNER
jack and the
LINEAR
jack pin ) are common circuits.
Therefore, the maximum voltage at T; G1' pin
) of the
LINEAR
jack must not exceed V.
GND
EXT ALC
TX GND
16


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  • Green Light on VFO A and MEM is flashing and no audio. Even tried Factory Reset and still flashing. How do I fix this? Submitted on 6-12-2022 at 07:37

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