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Assistive Listening Systems
The TX-37A Transmitter is the core of Gentner Assistive
Listening Systems. The transmitter utilizes leveling multiband compression, peak limiting, and the patented Aphex
Aural Exciter
®
to process audio for maximum
intelligibility and loudness. While other assistive listening
transmitters simply increase volume, Gentner’s TX-37A
actually enhances the sound quality to increase audio
clarity at louder levels. It also eliminates the potential for
clipping and overmodulation.
The transmitter can be set to 37 different frequencies,
allowing you to use multiple transmitters in one location
while reducing the possibility for audio interference. This
is especially useful for education and simultaneous
translation applications. Its universal input stage accepts
audio from mic, line, or speaker levels producing
exceptional audio quality at all levels. Connection is made
to the existing audio system via a tape or mixer
auxiliary output.
The transmitter is designed with a compact, steel, 1/2
rack unit chassis. The shielded steel chassis protects the
unit from damage and keeps out hum as well as other
system noise. Gentner provides a rack mount kit* (sold
separately) to store the transmitter in a standard 1U
rack space.
• Theatrical productions, such as the
opera, ballet, symphony, and plays
• Concerts in auditoriums or stadiums
• Lectures in convention centers
• Outdoor, sporting events
• Church services
Features and Benefits
• Only transmitter to combine multiband compression,
automatic gain control, and peak limiting so there is no
clipping or overmodulation
• Superior overall sound quality, and dynamics control
• T ransmits to an area of more than 700,000 square feet,
so the TX-37A is low cost for large venues
• Easily connects to any source—universal input stage
provides input for mic, line, or speaker level, balanced
or unbalanced
• Field selectable channels (37) with digital tuning for
lower risk of interference
• Built-in test tone aid for quick and easy receiver tuning
• Supplied with flex antenna, remote mount, and 50'
RG174 type cable
• Audio input level meter for visible indication of audio
input and levels
• Adjustable RF level allows control of RF coverage
• Rugged steel chassis for enhanced RF quality
• Audio monitor jack with volume control
• Aphex
®
processing for increased intelligibility
• Wide area FM system works outdoors in bright light,
no line of sight restrictions
Gentner’s TX-37A actually enhances the sound
quality to increase audio clarity at louder levels.
Applications
TX-37A Transmitter Transmitters
* single rack mount kit
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Specifications
Dimensions (LxDxH)
8.25" x 7.25" x 1.75"
20.96 x 18.42 x 4.5 cm
Weight
2.5 lb/1.13 kg (dry)
5.4 lb/2.46 kg (shipping)
Audio Inputs
Mic: 600Ω balanced, 10mV
Line: 600Ω balanced, 1V
Line: 10kΩ unbalanced, 1V
Speaker: unbalanced
Automatic Gain Control Range
40dB
Manual Input Level Control
20dB
Signal to Noise Ratio
60dB
Transmission Type
FM modulation
Maximum Deviation
±25kHz, 50kHz total
Maximum Radiated Power
8000uV/m at 30M
RF Level Adjust
1/4, 1/2 and full power
Frequency Control
Digitally synthesized, crystal
controlled
Frequency Stability
0.005%
Selectable Frequencies
37 channels between 72–76MHz
Power Requirements
9–15VDC at 500mA
assistive listening systems
©2002 ClearOne, Inc. All rights reserved. Other product names may be trademarks of their respective owners.
Information in this document subject to change without notice. 802-402-201 Revision 1.3
Starin Distributing, Inc • 1531 South Calumet Road • Chesterton, IN 46304 USA • (219) 929-4127 • Fax: (219) 929-4377 • www.gentnerals.com
connector for a local or remote antenna. The RF output level is adjustable
by a rear panel slide switch providing
1/4, 1/2, and full power.
The transmitter has XLR balanced and RCA unbalanced input jacks
selectable as balanced mic, balanced
and unbalanced line, and unbalanced
speaker audio signals. There is a front
panel control to adjust the audio input
level with an LED audio level display.
There is a switchable high-pass filter
providing a 6dB/octave rolloff at
180Hz. There is an audio processing
chain consisting of wide-band AGC,
multi-band compression, Aphex Aural
Exciter
®
, and peak limiting. There is a
The transmitter operates in the
72–76MHz Auditory Assistance Band
as approved by the FCC. The transmitted field strength won’t exceed
80mV per meter at three meters. The
operating frequency is be digitally
selectable by rear panel thumbwheel
switches to any of 37 frequencies in
the approved band. The transmitter is
FCC and Industry Canada approved.
Maximum FM deviation does not
exceed a total of 50kHz. Frequency
stability is controlled by a phaselocked loop frequency synthesizer with
crystal reference and is accurate within ± 0.005% from 0–50° C. The
transmitter has a 50Ω antenna
front panel control to regulate the
overall amount of audio processing
and a switchable 1kHz test tone to aid
setup and receiver tuning.
The transmitter is powered by an
external AC line to 12VDC power
adapter. The front panel has a power
switch with LED and an LED to indicate proper RF carrier operation.
There is a 1/4" stereo monitor jack
with volume control. The transmitter
is rack mountable in a standard 1 RU
rack steel package.
The TX37-A is specified.
A&E Specifications
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