Williams Sound Tablet Accessory CHG3512 User Manual

Determine the length of the audio cable needed to connect to the sound system to the WIR TX90 transmitter. Install the supplied 
Phoenix connector on the end of the audio cable to be connected to the transmitter. See the back of the WIR TX90 for wiring 
instructions.

A232

SIGNAL

SHIELD

–

G

+

SIGNAL

SHIELD

–

G

+

SIGNAL

JUMPER

A231

POWER ON INDICATOR

FREQUENCY 
SELECTION CONTROL
(2.3/2.8 OR 3.3/3.8)

CHANNEL
ON/OFF
CONTROL

CHANNEL
ON/OFF
CONTROL

AUDIO
ADJUSTMENT
CONTROL
(VOLUME/TONE)

AUDIO
ADJUSTMENT
CONTROL

The WIR TX90 will accept line level, balanced or unbalanced audio inputs. If you wish to operate in single channel mode, plug the 
audio cable with the installed Phoenix connector in “Channel A” OR the “Channel B” connector. If you choose to operate in two 
channel mode, plug the audio cables with Phoenix connectors in both “Channel A” AND “Channel B” connector. 

NOTE:  By default, the WIR TX90 is set to operate in two-channel mode. To turn Channel A or Channel B on/off, refer to the 

instructions Selecting a Channel, below.

The WIR TX90 offers two sets of carrier frequencies for Channel A and Channel B: 
2.3 and 2.8MHz or 3.3 and 3.8MHz.

The WIR TX90 is preset to 2.3 and 2.8 MHz, which are the most commonly used. Move the slide switch to select a pair of 
operating frequencies.

To activate a channel, press the “CHANNEL” button until the channel “ON” indicator lights. For example, to operate only channel 
A, press the “CHANNEL” button until only the channel A “ON” indicator lights. To operate both channel A and B, press the 
“CHANNEL” button until both “ON” indicators light.

Note: If you’re only using one channel, make sure the other channel is turned off to maximize system coverage.

7

MAN 119H