142 Appendix E Testing with the TBA0STU Calibration Test Unit TB9400/TN9275 Installation and Operation
© Tait International Limited May 2023
Note 1 The TB9400 reciter provides +5.2V on pin 13 of the system interface. This
is insufficient for correct operation of the CTU’s audio amplifier. The
supplied power cable should be connected to the PMU auxiliary 12V or
24V power supply.
Do not power the CTU from a PMU fitted with a 48V auxiliary power
supply board.
If you are not using the LED indicators or built-in audio amplifier, it is not
necessary to connect a power supply.
1$
Speaker volume control Supported for monitoring the
balanced line output
1%
RSSI output Supported This output is used to monitor
the RSSI output voltage
1^
Digital output LEDs Supported for digital outputs 1
and 2
These LEDs indicate the status
of the DIO1 and DIO2 on the
system interface connector.
They are lit when these digital
outputs are active low.
1&
Ground connector Supported This banana socket can be used
as ground with RX GATE, TX
KEY and RSSI. It is connected
to the CTU and system interface
connector ground.
1*
Antenna (simplex) relay output
and LED
Supported (see Note 3) This output is connected to the
antenna relay output system
interface connector. The LED is
lit when the output is activated.
1(
Keying switch for transmitter Supported to key the transmitter Set this switch to ON to key the
transmitter. When the switch is
in the OFF position, applying a
signal to the TX KEY banana
socket will control the state of
the transmitter.
2)
TX key activation Supported to key the transmitter Ground this input to key the
transmitter. Alternatively, turn on
the TX KEY switch
1(.
2!
RX gate output and LED Supported to indicate the RX
gate is active
This output is connected to the
Rx Gate output on the system
interface connectors. The
adjacent LED is lit when the
receiver gate is open.
2@
DC input Supported (see Note 1) Connect a 10 to 32VDC power
supply to this input. This supply
powers the speaker and LEDs.
2#
System control bus connector Not supported
Function Supported by TB9400 Information
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