AB-120 Announcer Console
The connector is also 5 pin compatible and most standard intercom headsets can be directly
plugged into the unit.
Options
The construction of the AB-120 lends itself to modification. The 6 pin XLR could be replaced
with a 5 pin XLR.
Next to the headset connector is a 1/4 inch hole intended for the user to install a stereo phone
jack for a separate set of headphones.
Electret microphone bias can be enabled by adding a jumper on internal connector J7. This
connector has pins 1, 3 and 4 wired to the headset connector. To enable electret microphone
bias, add a jumper between pints 5 and 6.
Mic Out Connector
The Mic Out connector provides a feed of microphone input after amplification. The connector
is an XLR-3M and is as follows:
l
Pin 1 = ground shield
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Pin 2 = +ve mic output
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Pin 3 = -ve mic output
Intercom Line Connectors (XLR 3 male and female)
The AB-120 has a male and female pair of XLR 3 connectors for the intercom line. The
male/female pair of connectors are wired paralleled and intended for loop through connection.
The pinout of the connectors when used with a Clear-Com party-line system is as follows
(place the channel select switch to 2):
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Pin 1 - ground shield
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Pin 2 = power (+25 to +30 VDC)
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Pin 3 = audio
The pinout of the connectors when used with TW(RTS) intercom systems is as follows (place
the channel select to the desired channel):
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Pin 1 - ground shield
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Pin 2 = audio 1 and power (+25 to +30 VDC)
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Pin 3 = audio 2
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