Listen Technologies LA-140, Design Manual

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LT-82
Design Guide Design Guide
LT-82
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selection shall be capable of being locked. Multiple transmitters shall be capable of being daisy-chained together to transmit up to
four channels simultaneously. The transmitter shall have a timer that shuts off the carriers after 30 minutes when no audio is present at
the transmitter. The transmitter shall have a SNR of 60 db or better. The device shall have an audio frequency response of 63 Hz to 15
kHz, +/- 3db. It shall have two mixing audio inputs, one balanced XLR/phone input and one unbalanced RCA input. The device shall
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processor that is capable of automatic gain control and limiting. The transmitter shall provide power for up to two radiators over
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Specification LT-82
RF
Carrier Frequencies Selectable: 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
Number of Channels Four channels. Selectable one channel per transmitter (mono or stereo)
Carrier Shut Off0 Carrier will shut off when no audio is present for 30 minutes to preserve radiator life.
Frequency Accuracy +/- .005% stability 0 to 50C
Transmitter Stability 50 PPM
RF Output
(Two (2) BNC connectors, for connection to radiator(s) and/or additional transmitter(s).
50 mV, 50 ohm, -15 dBm
RF Input
One (1) BNC connector, for connection from additional transmitter(s).
50 mV, 50 ohm, -15 dBm
Compliance FCC Part 15, Industry Canada, CE, RoHS
Audio
** All system specifications are wireless end-to-end
System Frequency Response
63Hz - 15kHz (+/- 3dB)
System Signal to Noise Ratio (A-weighted)
Mono: >60dB
Stereo: >52dB
System Distortion <2% total harmonic distortion (THD)
Audio Input 1
Mono Input (Rear Panel). Female-XLR and 1/4 in combo connector, balanced, 0/-
55dBu (line/mic) nominal input level adjustable; -30/+21dBu (mic/line) maximum
input level; impedance 20k/1k ohms (line/mic); phantom power +12VDC
Audio Input 2
Stereo or Mono Input (Rear Panel). (Two) Phono connectors, unbalanced, -10/+10dBu
nominal input level adjustable, +30dBu maximum, impedance 100k ohms
Audio Processing Compression can be turned on/off. Slope adjustable from 1:1 to 4:1. Default 2:1
Contour Cuts and boosts frequencies above 5 kHz
Combined Audio Output (Mix)
Input 1 and Input 2 Mixed Output (Rear panel). Two (2) Phono connectors, unbal-
anced, -10dBu nominal output level, +19dBu maximum, impedance 10 ohms.
Headphone Output (Monitor)
Front panel. (One) 3.5mm connector, unbalanced, adjustable output level, +7dBu
maximum, impedance 10 ohms. 100mW, 32 ohms, 3.5mm stereo.
Controls
Front Panel
Power, Test Tone on/off, Channel up/down, Input Level, Transmit Level, Contour,
Headset Level
Rear Panel Input 1 Level (Line, Mic, Mic-Phantom Power), Input 2 Level (-10/+10 dBu)
Internal Adjustments Compression ratio for audio processor
Programming Stereo on/off, Processing on/off
Indicators
Unit Power Red LED illuminates when the unit is powered up (front panel)
Input 1, Input 2, Transmit Level Indicates Input 1, Input 2, and Transmit audio levels. 10 segment LED’s (8 green, 2 red)
Stereo Indicated by a green LED when on (front panel)
Processing Indicated by a green LED when on (front panel)
RF Carrier Indicates carrier is active on the LCD Display (front panel)
LCD Display Channel designation, lock status, RF Carrier, programming (front panel)
Test Tone Red LED illuminates when test tone enabled (front panel)
Power
Power Supply
In-line switching mode power supply, Listen part number LA-205
Input: 100-240 VAC, 47-63 hz
Output: 30 VDC, 1.5 A
Output Connector: RJ-45
Compliance: UL and CE Listed
Power Output: Two (2) RJ-45 jacks. For remote powering up to 2 radiators.
Power Line Cord
North America, Type B, (LT-82-01)
Asia, UK, Type G, (LT-82-02)
Euro type J, (LA-82-03)
Physical
Dimensions (H x W x D) 1.75 x 8.50 x 9.13 in. (4.5 x 21.5 x 23 cm)
Color Grey with White Silk Screening
Unit Weight 2.6 lbs. (5.7 kg)
Unit Weight with LA-205 Power Supply 3.8 lbs. (8.3 kg)
Shipping Weight 4.4 lbs. (9.7 kg)
Rack Mounting
One rack space height, 1/2 rack space wide. One or two transmitters can be mounted
in one rack space. Optional rack mount (LA-326) not included.
Environ-
mental
Temperature - Operation -10 C (14 F) to +40 (104 F)
Temperature - Storage -20 C (-4 F) to +50 (122 F)
Humidity 0 to 95% relative humidity, non-condensing
•Specifications are subject to change without notification.