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MAN 168C

POWER IN

MIC CHANNEL

SELECTOR

LINE IN BALANCED/

UNBALANCED SELECTOR

TX75 BUS 
OUT TO 
SLAVE (1)

TX75 BUS
OUT TO 
SLAVE (2)

MIC

IN

CH 1 AUDIO 

LEVEL INDICATOR

(YELLOW)

CH 2 AUDIO 

LEVEL

INDICATOR

(YELLOW)

SLAVE TRANSMIT

POWER INDICATOR

(YELLOW)

SLAVE POWER
INDICATOR
(GREEN)

INDICATOR 
LIGHTS
(ON/OFF)

MIC

ADJUSTMENT

POWER 

INDICATOR

(3.3) TX-75b (3.8)

(2.3) TX-75 (2.8)

TX75 BUS IN FROM

MASTER

SLAVE TRANSMIT

STATUS INDICATOR (YELLOW)

SLAVE POWER 
INDICATOR (GREEN)

INDICATOR LIGHTS
(ON/OFF)

A181

RCA IN

RCA IN

WIR TX75-S Infrared Emitter Quick Setup Guide

Determine Transmitter

 

and

 

emitter 

(

slave

placement

Determine the best location where the TX75 or TX75b will cover the desired 
area. Remember, IR signals need a clear line of sight to the receiver for optimum 
reception. It is usually better to have the transmitter located above the height of 
the receiver users.
The transmitter can be mounted on the wall or ceiling with the included mounting 
bracket. The threaded connector on the top and bottom of the transmitter is 
standard to most camera tripods. 

WIR TX75 Master Rear View

WIR TX75-S Slave Rear View

Plug the power supply into the transmitter. Make sure the green power LED is 
on. Install the audio input cord of your choice and apply signal to the RCA CH1, 
CH2 or both. The audio level indicator should be blinking at peak audio levels. 
Be sure that the receivers are set to the same channel/frequency used on the 
transmitter.

Important: Point the transmitter (TX-75) and emitter (TX75-S) towards the 
listening audience.

Remember: Most objects block infrared light. The transmitter and emitter cannot 
be concealed behind walls, glass, curtains, etc.

Optional WIR TX75-S emitter for additional coverage

For larger facilities, additional emitters can be used to increase the total coverage 
area. The WIR TX75 is capable of driving two WIR TX75-S slave emitters. Power, 
baseband and digital data bus are fed via CAT-5e cable to each TX75-S slave.

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