9
WIR TX75 PRO Infrared Transmitter
Connect Power
WARNING: MAINS VOLTAGE MUST NOT FALL BELOW 100VAC, 0R SYSTEM PERFORMANCE WILL BE
GREATLY REDUCED. UNIT MAY ENTER RESET MODE UNTIL POWER IS RESTORED.
1. Plug the power supply output cord into “Power In” on the WIR TX75.
2. Attach a line cord to the power supply.
3. Plug the power supply into the AC outlet. TFP 046: 100-240 VAC IN, 50 / 60 Hz.
This system is designed for class 2, low-voltage wiring. Always follow local electrical codes when using low-voltage wiring.
green Power
The WIR TX75 PRO is equipped with a sleep/power save feature. If no audio is present on either channel for three minutes, the
transmitter will automatically go into sleep/power save mode. This mode decreases power consumption by 80 percent. Units
will automatically start up when audio is activated. This sleep/power save feature can be disabled. Contact Williams Sound for
instructions.
On power up, the WIR TX75 PRO performs a self-test to detect damage due to shipping, handling, tampering or incorrect
operation. If any failure is present, green indicator lights will blink. See WIR TX75 PRO Indicators table on page 12 for instructions
on how to read indicator lights.
Connect Audio Source
Automatic Channel detection/ Shutdown
The WIR TX75
c
offers two carrier frequencies: Ch 1 (
2.3
MHz) and Ch 2 (
2.8
MHz).
The WIR TX75
d
offers two carrier frequencies: Ch 1 (
3.3
MHz) and Ch 2 (
3.8
MHz).
Either unit automatically detects the presence of audio on the microphone and phoenix audio inputs, and transmits on either/both
channels when an audio signal is present on that channel. If audio is present on both the microphone and phoenix jack for a given
channel, the audio signals will be mixed.
When no audio signal is present on a channel for three minutes, the TX75 will shut down that channel. Operating the WIR TX75 PRO in
single-channel mode provides a 40 percent increase in range over two-channel mode.
line level Source (Phoenix connectors)
The WIR TX75 PRO will accept line level balanced or unbalanced audio inputs. Select the frequency(ies) you wish to transmit on
and connect your audio source(s) to the appropriate phoenix connectors/jack(s). No adjustment needs to be made for balanced or
unbalanced inputs; this is internally detected & managed. See figures 7 & 8 for balanced and unbalanced cable configurations.
microphone Source (3.5mm mono Plug)
Plug an electret microphone into the 3.5mm “Mic In” jack (MIC 027, MIC 100, or MIC 090). To assign the microphone to Ch 1 use
the Mic Channel Switch to select “2.3” on the TX-75c (or “3.3” MHz on the TX-75d). To assign the microphone to Ch 2 use the Mic
Channel Switch to select “2.8” on the TX-75c (or “3.8” MHz on the TX-75d).
