Williams Sound Switch MOD 232 User Manual

Two Channel Infrared Modulator  
Model MOD 232  
D
D
Description:  
The MOD 232 Modulator is designed to operate with a TX9 emitter operating on 2.3/2.8/3.3/3.8 MHz  
frequency. Each microprocessor controlled MOD 232 modulator can handle up to two audio channels.  
Baseband outputs can daisy-chain two MOD 232 together for four-channel operation. Flexible combi-  
nation jacks permit balanced/unbalanced line-level inputs. Carrier frequencies are controlled by the  
microprocessor and a frequency synthesizer for rock-solid frequency control.  
Applications:  
• Churches • Schools • Auditoriums • Conference Rooms • Theaters  
MOD 232 Modulator:  
Size, Weight:  
Color:  
8.5" W x 8.2" D x 1.7" H (21.5 cm x 20.8 cm x 4.4 cm), 3.1 lbs (1.5 kg)  
Black epoxy paint with white legends  
Rack Mount:  
1/2 rack space wide, 1 rack space high, one or two modulators may be mounted in a  
single IEC rack space with RPK 005 (single) or RPK 006 (double) Rack Mount Kits  
Wall Transformer, 24 VAC, 50-60 Hz, 15VA  
Power Supply:  
North America:  
Europe:  
UK:  
TFP 016, UL/CSA  
TFP 027-01, 2-pin Schuko plug, CE  
TFP 027-02, 3-pin UK plug, CE  
Modulation:  
Carrier Frequency:  
FM Wideband, +50 kHz deviation, 50 uS pre-emphasis  
Channel A: Selectable, 2.3/2.8/3.3/3.8 MHz,  
Channel B: Selectable, 2.3/2.8/3.3/3.8 MHz  
Signal-to-Noise Ratio:  
Frequency Response:  
Total Harmonic Distortion:  
Audio Processing:  
More than 60dB  
30 to 16,000 Hz, +1 dB, -3 dB, electrical response  
Less than 2%, electrical response  
Compression (slope) adjustable from 1:1 to 4:1  
Switchable compression gain: Moderate: 16dB. Max: 33dB  
15-minute timer shuts off carrier when no audio is present (can be disabled)  
Auto Carrier Shut-Off:  
Two Channel Infrared System Modulator  
Microprocessor Controlled  
Williams Sound  
MOD 232 Front Panel:  
+9  
+9  
+6  
+3  
0
Inputs Mixed  
3.8  
3.8  
3.3  
2.8  
2.3  
Frequency Synthesized  
+6  
+3  
0
5
5
Phones  
3.3  
2.8  
2.3  
4
6
4
6
Compress  
Compress  
7
8
9
7
8
9
Stereo  
IR  
3
2
1
3
2
1
- 3  
-6  
- 3  
-6  
Power  
-9  
-9  
CH A  
CH B  
-12  
-15  
-18  
-12  
-15  
-18  
Frequency  
(MHz)  
Frequency  
(MHz)  
0
10  
0
10  
Level  
Level  
Channel A  
Channel B  
Power Switch:  
Two-position push button, ON/OFF  
Green LED  
CHA and CHB Input Level, rotary knobs  
CHA and CHB Audio Level, 10-segment LED’s  
4 green LED carrier “on” indicators per channel (indicates frequency, malfunctions)  
1:1 to 4:1  
Power Indicator:  
Audio Level Controls:  
Audio Indicators:  
Carrier LEDs:  
Compress Control:  
Input Mix LED:  
Stereo LED:  
Indicates inputs A and B audio are mixed and transmitted by CHA and CHB off  
Indicates stereo mode  
Phones Switch:  
Phones Output:  
Infrared Test LED:  
Selects CH1 or CH2 for phones when not in stereo mode  
1/4" TRS headphone jack. Accepts stereo, mono and any impedance phones.  
IR LED for receiver testing, monitoring and audio signal testing.  
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!  
©2007, Williams Sound Corp. MCAT 002B  
1
 
Two Channel Infrared Modulator  
Model MOD 232  
D
D
Bid Specs:  
The infrared system shall consist of separate modulator and emitter units, with portable receivers. The  
modulator unit shall be a half-rack style, metal enclosure. A rack panel shall be available to mount one  
or two modulator units within a single EIA rack space. An adjustable floor stand and mounting bracket  
shall be available to mount the modulator and emitter together for portable operation.  
The modulator shall provide two channels of selectable FM carrier signals, 2.3/2.8/3.3/3.8 MHz, so that a  
single modulator can be used to simultaneously transmit up to two channels, and two modulators can  
be ganged together to transmit up to four channels simultaneously. The carrier signals shall use 50 kHz  
deviation and 50 µS pre-emphasis. The carrier signals (baseband) shall be transmitted to one or more  
emitters by 50 ohm RG58 coaxial cable with BNC-type connectors. A BNC–type baseband input jack and  
baseband output jack shall be provided on the modulator. The modulator shall be powered by an  
external 24 VAC, 10 VA, 50-60 Hz power supply, connected via a three-pin Molex power connector.  
It shall have a rocker-type power switch, power LED indicator, four carrier indicator LEDs and two bar  
graph-type LED audio indicators. The modulator shall have a modulated IR LED on the front panel for  
testing purposes, and a headphone jack that accommodates mono and stereo 1/4" headphones, and  
channel monitoring switch. The modulator shall have two rotary audio input level controls, and a screw-  
driver adjustable control for varying the input compression from 1:1 to 4:1. The modulator shall have  
two timers that automatically shut off the carriers when there is no audio signal present for 15 minutes.  
The modulator shall have two combination input jacks that accept 3-pin XLR plugs for balanced micro-  
phone input or 1/4" TRS plugs for balanced or unbalanced line-level inputs. The XLR inputs shall be low  
impedance, accept signal levels from 100 µV to 90 mV and supply 15 V simplex power per DIN45596. The  
TRS jacks shall accept balanced or unbalanced audio signal levels from 21 mV to 10 V. The modulator  
shall have CE, FCC, RoHS, and WEEE approval and carry a five-year parts and labor warranty.*  
The modulator shall be the Williams Sound Corp. model MOD 232.  
*90 days on accessories.  
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!  
©2007, Williams Sound Corp. MCAT 002B  
3
 
Two Channel Infrared Modulator  
Model MOD 232  
D
D
Contact:  
United States  
Williams Sound Corp.  
10321 W. 70th Street  
Eden Prairie, MN 55344  
Phone: 800-328-6190 or 952-943-2252  
Fax: 952-943-2174  
Canada  
Thorvin Electronics  
2861 Sherwood Heights Dr. Units 36-37  
Oakville, ON L6J-7K1 Canada  
Phone: 800-323-6634 or 905-829-3040  
Fax: 905-829-4196  
South America  
DPTech  
SIA Trecho 3/4 Lote 335 2°. Andar  
71200-030 Brasília, DF  
BRAZIL  
Phone: (5561) 361-1384  
Fax: (5561) 361-0948  
United Kingdom  
Sound Associates  
Keeble House, 81 Island Farm Road  
West Molesey, Surrey KT 2SA  
United Kingdom  
Phone: (44) 020 8939 5900  
Fax: (44) 020 8939 5901  
Asia, Europe, Latin America, Mexico  
International Sales Department  
Williams Sound Corp.  
10321 W. 70th Street  
Eden Prairie, MN 55344 USA  
Phone: +1 952 224 7791  
Fax: +1 952 943 2174  
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE!  
©2007, Williams Sound Corp. MCAT 002B  
4
 

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