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Option settings – Clear-Com TW-47 User Manual

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T W - 4 7 T W O - W A Y R A D I O I N T E R F A C E

1 - 7

OPTION SETTINGS

Internal switches select the intercom line interface of the TW-47.
To access the switches, remove the four screws retaining the top
cover and remove it. The switches are located on the PCB on the
right hand side of the unit. The switch handles are easily
accessible. The settings are as follows:

• When the Intercom Compatibility Switch is set to Clear-Com

(C-C), intercom audio is on pin 3 of the XLR connector. The
DC level call signal is sensed on this pin. In this position, the
TW intercom channel switch setting has no effect.

• When the Intercom Compatibility Switch is set to TW, the

intercom audio XLR pin connection is determined by the TW
intercom channel switch. The call signal is sensed as a 20 KHz
signal on the selected intercom audio pin.

• When the TW Intercom Channel Switch is set to pin 2,

intercom audio is on pin 2 (channel A) of the XLR connector,
and when the TW intercom channel switch is set to pin 3,
intercom audio is on pin 3 (channel B) of the XLR connector.

The Figure 1-6 on page 1-8 shows the location of the jumpers
and switches on the printed circuit board.