9
WIR TX75 C/D Infrared Transmitter
Connecting the 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 WIR TX75 C/D will shut down that channel. Operating the WIR TX75
C/D in single-channel mode provides a 40 percent increase in range over two-channel mode.
Line Level Source (Phoenix connectors)
The WIR TX75 C/D 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 WIR TX75 C (or “3.3” MHz on the WIR TX75 D). To assign the microphone to Ch 2
use the Mic Channel Switch to select “2.8” on the WIR TX75 C (or “3.8” MHz on the WIR TX75 D).
Figure 7: Balanced line out (XLR) to WIR TX75 C/D PRO line input (Phoenix Contact® connector) cable
1
2
3
FEMALE XLR
RED (IN PHASE)
RED
2 CONDUCTOR
WITH SHIELD
BLACK (SIGNAL)
BLACK
TO TX75
SHIELD NOT CONNECTED
ON TX75 CABLE END
1= SHIELD, 2= RED (SIGNAL IN PHASE), 3= BLACK (SIGNAL)
PHOENIX
+
-
UNBALANCED AUDIO
1
2
3
FEMALE XLR
RED (IN PHASE)
RED
2 CONDUCTOR
WITH SHIELD
BLACK (SIGNAL)
BLACK
TO TX75
SHIELD CONNECTED TO GND
ON TX75 CABLE END
1= SHIELD, 2= RED (SIGNAL IN PHASE), 3= BLACK (SIGNAL)
A509
PHOENIX
+
-
BALANCED AUDIO
Figure 8: Unbalanced line out (XLR) to WIR TX75 C/D PRO line input (Phoenix Contact® connector) cable
1
2
3
FEMALE XLR
RED (IN PHASE)
RED
2 CONDUCTOR
WITH SHIELD
BLACK (SIGNAL)
BLACK
TO TX75
SHIELD NOT CONNECTED
ON TX75 CABLE END
1= SHIELD, 2= RED (SIGNAL IN PHASE), 3= BLACK (SIGNAL)
PHOENIX
+
-
UNBALANCED AUDIO
1
2
3
FEMALE XLR
RED (IN PHASE)
RED
2 CONDUCTOR
WITH SHIELD
BLACK (SIGNAL)
BLACK
TO TX75
SHIELD CONNECTED TO GND
ON TX75 CABLE END
1= SHIELD, 2= RED (SIGNAL IN PHASE), 3= BLACK (SIGNAL)
A509
PHOENIX
+
-
BALANCED AUDIO