Clear-Com AB-120 - Manual (Page 21)

Clear-Com Communication Systems
AB-120 Announcer Console Instruction Manual
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INSTALLATION
The AB-120 is a versatile interconnection box and can accommodate
many types of installation. The AB-120 has two modes of operation;
sportscaster mode and announcer mode.
When shipped from the factory the AB-120 has its internal jumpers and
dip switches set to implement the Clear-Com party-line setup. The unit
will be configured for Sportscaster Console operation and the
microphone output level is set for -10 dBu with a dynamic microphone
input.
The AB-120 can operate on power from the intercom line or from a
suitable external DC power supply.
SPORTSCASTER MODE
MOMENTARY MICROPHONE MUTE
Place a jump jack on pins 1 and 2 of JP11. Both front panel buttons are
momentary in operation and microphone output is active except when
either of the buttons is pressed. The red LED next to the mute button is
light where the output is active.
Pressing the mute button turns the output of the microphone circuit off
as long as the button is pressed.
Pressing talkback turns the output of the microphone circuit off and
sends the signal to the intercom line. The green LED next to this button
is lit when the talkback circuit is activated.
ANNOUNCER MODE
LATCHING MICROPHONE
Place a jump jack on pins 2 and 3 of JP11. In this mode, the
microphone on/off button is latching in action and talkback is
momentary in action. The red LED next to the on/off button is lit
whenever the microphone output is active.
Pressing the on/off button toggles the state of the mic from on to off, or
vice versa, each time the button is pressed.
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