TBA0STU/TBA0STP CTU Operation Manual
Using the CTU with a TB8100
25
© Tait Electronics Limited September 2005
Speaker
The CTU is fitted with a 0.5W 16
Ω
speaker. Audio from LINE OUTPUT
or UB OUTPUT can be connected to this speaker.
VOLUME
This controls the volume of the speaker. Rotate clockwise to increase the
volume, and anticlockwise to decrease the volume.
RSSI
This output is used to monitor the RSSI output from the 25-way system
interface connector. (Not available if the system interface connector is
15-way.)
DIGITAL OUTPUTS
These LEDs indicate the status of the digital output lines on the system
interface connectors, as described in the table below. They are lit when the
digital output lines are active. Note that the table only shows the digital
outputs which can be monitored by the LEDs.
GND
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.
TX RELAY
This output is connected to the Tx Relay output on the 25-way system
interface connector, and to digital output 3 on the 15-way system interface
connector. The LED is lit when the output is activated.
TX KEY Switch
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.
TX KEY socket
Ground this input to key the transmitter. Alternatively, turn on the TX KEY
switch (
1(
).
RX GATE
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.
POWER
Connect a 10 to 32 VDC power supply to this input. This supply powers
the noise source, speaker, LEDs, and RS-232 communications.
This DC input connector is not used if power is supplied via the system
control bus or system interface connectors.
1#
1$
1%
1^
CTU
LED
System Interface Board
Isolated
Isolated E&M
TaitNet/
TaitNet RS-232
1
pin 11 - digital out 1
pin 11 - digital out 1
pin 12 - digital out 1
2
pin 12 - digital out 2
pin 12 - digital out 2
pin 13 - digital out 2
1&
1*
1(
2)
2!
2@
