E.F. Johnson Viking VX Series, Руководство пользователя

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CIRCUIT DESCRIPTION
6-13
September 1994
Part No. 001-2008-300
WO 120 CTRL OUT
This capacitive feedthrough pin carries the out-
put of the power control driver on the RFIB to the
power control pin of the power module on the Power
Amplifier board. The voltage varies from 5.5V-11V
with current as high as 200 mA.
WO 121 FWD PWR
This capacitive feedthrough pin is the forward
power sense line. It is a voltage source that is a func-
tion of the output power of the Power Amplifier. The
voltage level will be between 0V-5V and drive a 10k
ohm load. A typical voltage of 2.6V correlates to 75W
out of the PA. This line goes through the multiplexers
and A D LEVEL line to the Controller for processing.
WO 122 RF OUT 1
This capacitive feedthrough pin is the forward
power sense of the output power on one side of the
Wilkinson combiner. It is a voltage source that is a
function of the output power of RF device number 1.
The voltage level will be between 0V-5V and drive a
10k ohm load. This line goes through the multiplexers
and A D LEVEL line to the Controller for processing.
WO 123 RF OUT 2
This capacitive feedthrough pin is the forward
power sense of the output power on one side of the
Wilkinson combiner. It is a voltage source that is a
function of the output power of RF device number 2.
The voltage level will be between 0V-5V and drive a
10k ohm load. This line goes through the multiplexers
and A D LEVEL line to the Controller for processing.
WO 124 RF OUT 3
WO 125 RF OUT 4
Not used at this time.
WO 126 REFL PWR
This capacitive feedthrough pin is the reflected
power sense line. It is a voltage indicative of the
power reflected due to a mismatch. The voltage pro-
duced will typically be such that less than a 3:1 VSWR
will not trigger alarms and when VSWR = 6:1 the con-
troller will reduce power. The voltage level will be
between 0V-5V and drive a 10k ohm load. This line
goes through the multiplexers and A D LEVEL line to
the Controller for processing. The time to sense and
reduce the power takes several seconds.
WO 127 TEMP
This capacitive feedthrough pin is the tempera-
ture sense line of the Power Amplifier. It will be a lin-
ear function of temperature ranging from 0V-5V out-
put and -30
°
C to +100
°
C (-22
°
F to 212
°
F) input when
driving a 10k ohm load. The primary functions of this
line are for fan on/off and PA power reduction. The
fan will typically be turned on at 50
°
C and off at 42
°
C.
The PA should have power reduced when 90
°
C
(194
°
F) is reached and with absolute turn-off at 95
°
C
(203
°
F). This line goes through the multiplexers and
A D LEVEL line to the Controller for processing.
6.4.5 EXCITER CONNECTOR (J102)
The connector from the Exciter (J401) to the RF
Interface board (J102) links the Exciter to the TPI card
in the Controller Backplane.
Pin 1 VCC1
The voltage on this pin is +15V, nominal current
of 150 mA. It provides current to the Exciter from the
RFIB.
Pins 2-8 GROUND
Pin 9 3.5V DC
The 3.5V DC TCXO reference voltage from the
Exciter to the TPI.
Pin 10 GROUND
Pin 11 LPTT
The Logic Push-To-Talk (LPTT) is an open col-
lector from the Controller. It has a sink capability of
20 mA nominal and a voltage rating of 18V maximum.
The transmitter should produce power when this pin is
a logic low.