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© 2012, Williams Sound, LLC MCAT 155C
Mid-range Infrared System
WIR TX75 Specications
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
A139
RCA IN RCA IN
(2.3) TX-75 (2.8)
(3.3) TX-75b (3.8)
Dimensions, Weight:
10.0" W (25.4 cm) x 3.1" D (7.9 cm) x 1.5" H (3.8 cm) w/o faceplate or 2.5" H (6.4 cm) w/faceplate, 0.6 lbs (0.3kg)
Color:
Black with silver colored silk screen and silver colored faceplate
Optional: white colored faceplate
Power Supply:
Desktop style international power supply with IEC line cord, 100-240 VAC input, 50-60Hz, 24W; 48VDC output
DC Power Input:
2.5mm ID barrel connector, 48 VDC, 0.4A center positive
Power Indicator:
Green LED
Sleep/Power Save Mode:
Shuts off carrier when no audio is present for 3 minutes
Modulation:
FM Wideband, ±50kHz deviation max, 50 μS pre-emphasis
Carrier Frequencies:
TX-75: 2.3MHz (Ch1) and 2.8MHz (Ch2).
TX-75b: 3.3MHz (Ch1) and 3.8MHz (Ch2).
Default at power on = carriers off. Carriers are automatically enabled upon presence of audio.
Emitter IR Power:
0.7 W
Master Only Coverage Area
(minimum, 1-Ch mode):
5,000 sq. ft in single-channel mode with the RX22-4 receiver (464 sq. m)
3,000 sq. ft in single-channel mode with the RX15-2 receiver (279 sq. m)
2,000 sq. ft in single-channel mode with the RX18 receiver (186 sq. m)
Audio Inputs / Controls:
Line inputs: RCA jack for Ch1 and Ch2 accept line level, balanced or unbalanced audio
Line in balanced/unbalanced switch: selects balanced or unbalanced line level audio for RCA jacks
Microphone input:
3.5 mm, stereo jack with signal and bias connected to tip, electret microphone compatible (4 VDC bias supply with 2.7k ohm
series resistor)
Microphone gain adjust:
Rotary potentiometer
Microphone channel switch:
selects microphone input to Ch1 or Ch2
Audio indicators:
Yellow LED blinks at nominal audio level. One per channel
Indicators On/Off:
2-position switch turns on/off indicator lights
“to slave” Output/Input:
(2) 8p8c RJ45 connectors output 48VDC 0.4A power, baseband RF and a bi-directional RS-485 bus for control and status
communications
Slave Status Indicators
(on “to slave” jacks):
Green: Power/Unit Status
Yellow: Transmit/Cable Status
Signal-to-Noise Ratio:
70 dB, (line input)
Frequency Response:
95Hz to 17.6kHz, -3dB re 1kHz (line inputs)
125Hz to 17.0KHz, -3dB re 1kHz (microphone input)
Total Harmonic Distortion:
<1% (1 kHz, nominal deviation, line or microphone input)
Operating Requirements:
0-50° C (32°-122°F)
Mounting Kit:
Wall or Ceiling mount: BKT 024 Omnidirectional mount
Optional: slave linking bar (MLB 003)
Warranty:
2 Years