TB9300 Installation and Operation Manual Appendix E Testing with the TBA0STU Calibration Test Unit 133
© Tait International Limited April 2024
1!
System interface connectors The DB25 connector is
supported
1@
Digital input switches Supported for digital inputs 3 to
12 on the TB9300
These switches let you set the
digital inputs high or low. The
standard switch settings are:
■ 1 = high, 5V (10k pull-up to
5V)
■ 0= low, active, 0V
1#
Speaker Supported for monitoring the
balanced line output
The CTU is fitted with a 0.5W
16 speaker. Audio from
balanced LINE OUTPUT can be
heard on the speaker.
1$
Speaker volume control Supported for monitoring the
LINE INPUT and UB INPUT
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.
Function Supported by TB9300 Information
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