26 Circuit Description TB8100 Installation and Operation Manual
© Tait Electronics Limited June 2005
Control Circuitry
The control panel board translates:
■ I
2
C messages from the reciter into an appropriate response on the LEDs
■ control panel key inputs and fan rotation inputs from both fans into
appropriate I
2
C messages
■ RS-232 communications from the programming port into 0V to 5V
open-collector signals which can feed from and drive up to six reciters.
Note When a reciter fitted with a TaitNet RS-232 system interface
board is used in a TB8100 BSS, the RS-232 port on the control
panel is disabled. In this situation you must connect to the
RS-232 port at the rear of the reciter. Refer to “TaitNet
RS-232” on page 122 for more details.
Audio Circuitry The standard and dual base station control panels provide a volume knob to
control the volume of the speaker. In addition, the control panel circuitry
performs gain control so that the power output into a 16Ω speaker is ≥0.5W
at the maximum position of the knob, with an input of 167mVpp.
Power Supply The control panel operates off a +28VDC (nominal) power supply provided
by the reciter. The power supply for the cooling fans mounted on the front
panel is fed through the control panel.
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