TB9300 Installation and Operation Manual Installation 87
© Tait International Limited April 2024
4.6.9 Connecting General Purpose Inputs and Outputs
General purpose inputs and outputs are connected via the DB-25 connector
on the rear panel of the base station.
Analog line operation requires reciter hardware version 1.01 or later.
Reciters with hardware version 1.0 can be upgraded to version 1.01 at a
Tait service center. Contact your Tait dealer for details.
The existing Tx key and Rx gate signals are sufficient for balanced
audio interconnection with connecting equipment compatible with 5V
TTL level signaling. Tait also offers an isolation adapter that provides
E&M isolated signaling (order number TBC101A).
It is recommended that E&M isolated signaling be used in the following
situations:
■ Locally connected equipment that is not 5V TTL signaling compatible
■ There is significant distance between connected equipment, and voltage
transients could cause equipment damage
From V3.40.00, unbalanced audio in and out are supported.
Unbalanced Audio
In - pin 5
The unbalanced audio input is AC coupled via a 10uF capacitor. Any DC
offset that may be present on an audio signal used to modulate the base
station transmitter is blocked by this capacitor.
Selecting extended bypass mode will DC couple the unbalanced audio
input path. Note: a license is required to enable selection of extended
bypass mode.
Unbalanced Audio
Out - pin 3
The unbalanced audio output is DC coupled and has a 2.5V DC offset. For
most applications users should AC couple this output to the external
equipment. For example, a 10F capacitor should be suitable.
The pin allocations for the DB-25 connector are given in the following
table:
Reciter External equipment
Vbias = 2.5 V
Unbalanced Audio Output
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