LISTEN TECHNOLOGIES LT-800-072 Stationary RF Transmitter User Manual

User Manual for LISTEN TECHNOLOGIES models including: LT-800-072 Stationary RF Transmitter, LT-800-072, Stationary RF Transmitter, Transmitter

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User Manual
LT-800-072 Stationary RF Transmitter LT-803-072 Stationary RF Transmitter LT-800-216 Stationary RF Transmitter
www.listentech.com

Dear Valued Customer,
Thank you for choosing Listen! We are dedicated to providing you with the highest quality products available and take pride in delivering outstanding performance to ensure you are completely satisfied. We independently certify each of our products to the highest quality standards. We are available to answer any questions you might have during installation or in the operation of our products. At Listen, it's all about you, should you have any comments or suggestions we're here to listen.
Here's how to reach us: +1.801.233.8992 | 1.800.330.0891 Toll Free (USA & Canada) support@listentech.com | www.listentech.com
Thank you and enjoy your listening experience!
Best regards, The Listen Team

Table of Contents

Package Contents

Specifications

Architectural Specifications

Specifications

Block Diagram

Quick Reference

Setup Instructions

Operating Instructions

Audio Control

Listen SQTM (Super Quiet)

RF Reception Maximization Strategies

Coaxial Cable

Channel Selection

Compatibility Charts

72 MHz Frequency Compatibility Chart

216 MHz Frequency Compatibility Chart

Phonak Frequency Compatibility Chart

Troubleshooting

Compliance Notice

FCC Statement

Industry Canada Statement

Warranty

Contacting Listen

Optional Accessories

Package Contents

LT-800-072 Contents
(1) LT-800-072 Stationary RF Transmitter (72 MHz) (1) LA-207 12 VDC Power Supply (1) Quick Start Guide

LT-800-072

LA-207

LT-803-072 Contents
(1) LT-803-072 Stationary 3-Channel RF Transmitter (72 MHz)
(1) LA-207 12 VDC Power Supply (1) Quick Start Guide

LT-803-072

LA-207

LT-816-072 Contents
(1) LT-800-216 Stationary RF Transmitter (216 MHz) (1) LA-207 12 VDC Power Supply (1) Quick Start Guide

LT-800-216

LA-207

Specifications

LT-800 Architectural Specifications
The stationary FM transmitter shall be capable of broadcasting on 57 channels. The transmitter shall have a SNR of 80dB or greater. The output power shall be adjustable to quarter, half or full. Channel tuning shall be capable of being locked. The device shall broadcast on both wide and narrow band channels. The device shall have an audio frequency response of 63 Hz to 15k Hz, ± 3dB at 72 MHz, or of 63 Hz to 10k Hz, ± 3dB at 216 MHz. It shall have two mixing audio inputs. The device shall have the following audio controls: input level, mix level and an adjustable low pass filter. The device shall have an audio processor that is capable of automatic gain control and limiting. The Listen LT-800 is specified.

Specifications*

RF Audio

Specifications RF Frequency Range Number of Channels Frequency Accuracy Transmitter Stability Output Power Antenna Antenna Connector Compliance
System Frequency Response System Signal to Noise Ratio (A-Weighted) System Distortion
Audio Input 1
Audio Input 2
Audio Processing (Process) Contour
Combined Audio Output (Mix)
Headphone Output (Monitor)

LT-800-072

LT-803-072

72.025 - 75.950 MHz

17 wide band, 40 narrow band

3 wide band

+/-.005% stability 32° to 122°F (0°- 50°C)

50 PPM

80,000uV at 3 m

Various Antennas available

BNC

FCC Part 15, Industry Canada

** All system specifications are wireless end-to-end

50 Hz - 15 kHz (±3 dB)

LT-800-216 216.025 - 216.9875 MHz 19 wide band, 38 narrow band
100mW (max allowed by FCC)
FCC Part 90, Industry Canada 50 Hz - 10 kHz (±3 dB)

80 dB SQ enabled; 60 dB SQ disabled

60 dB

80 dB SQ enabled; 50 dB SQ disabled

<2% total harmonic distortion (THD) at 80% deviation
Rear panel. (1) Female-XLR and ¼ in. combo connector, balanced, 0/-55 dBu (line/mic) nominal input level adjustable, -30/+21 dBu (line/mic) maximum input level, impedance 20k/1k Ohms (line/mic), phantom power +12 VDC. Rear panel. Two (2) Phono connectors, unbalanced, -10/+10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k Ohms.
Compression can be turned on/off. Slope internally adjustable from 1:1 to 4:1. Default 2:1
Cuts and boosts frequencies above 5 kHz
Input 1 and Input 2 Mixed Output (Rear Panel). Two (2) phono connectors, unbalanced, -10 dBu nominal output level, +19 dBu maximum, impedance 10 ohm.
Front panel. One (1) 3.5 mm stereo connector, unbalanced, adjustable output level, +7 maximum, impedance 10 Ohm.

Controls

Front Panel Rear Panel Internal Adjustments Programming

Power, Test Tone on/off, Channel UP/DOWN, Input levels, Mix level, Contour, Monitor volume control. Input 1 Level (line, mic, mic-phantom power), Input 2 Level (-10/+10 dBu), RF Power (low, mid, high) Compression ratio for audio processor SQ on/off (LT-800 only), process on/off, channel lock

Indicators

Input 1 and Input 2, Mix VU SQ (LT-800 only) and Processing RF Power LCD Display Test Tone

Indicates Input 1, Input 2 and Mix audio levels. 10 segment LED's (8 green, 2 red) Indicated by a green LED when on (front panel) Indicated on the LCD (low, mid, high)
Channel designation, lock status, RF Power Level, programming (front panel) Red LED illuminates when test tone enabled

Power

Power Supply Type Power Supply Input Power Supply Output Power Supply Connector Power Supply Compliance

In-line power supply. Listen part number LA-207 (Line cord is determined by each country's AC power standards). Input: 100-240 VAC, 50-60 Hz, 0.4 A Output: 12 VDC, 1.3 A, 15.6 W
Output Connector: .02 in. (5.0 mm) OD, .01 in. (2.5 mm) ID, barrel type UL, CE, GS, TÜV, RoHS

Physical

Dimensions (H x W x D) Color Unit Weight Unit Weight with Power Supply Shipping Weight
Rack Mounting

1.75 x 8.50 x 9.13 in. (4.5 x 21.5 x 23 cm) Dark Grey with white silk screening 2.6 lbs. (5.7 kg) 4.4 lbs. (2.0 kg) 5.0 lbs. (2.26 kg)
One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space. Optional rack mount (LA-326)

Environmental

Temperature - Operation Temperature - Storage Humidity

-10°C (14°F) to +40°C (104°F) -20°C (-4°F) to +50°C (122°F) 0 to 95% Relative Humidity, non condensing
*Specifications are subject to change without notification
3

Block Diagram

100-240 VAC 50-60 Hz 0.4 A

In-Line Power Supply
LA-207 (provided)

POWER

Off

Red LED

12 VDC 1.3A

Power Supply CPU Module

CHANNEL SELECT
Up Down
Listen LCD Display Backlighted

3.5MM Stereo
HEADPHONE
Volume

Remote Antenna Connection

Top Mounted Antenna Stud

BNC
ANTENNA

Transmitter RF Board

Functions controlled by the CPU Module

Low Mid

High

RF POWER

MIX Level VU Meter

Compression Ratio (internal adjustment)

Pre-emphasis

SQ Companding

Green

LED

MIX LEVEL

Off

Processing

Green LED

Off

CONTOUR

PROCESS

Input 1 VU Meter

Input 2 VU Meter

12VDC

Mic

Line

Mic Phantom Pwr

Input Level Front Panel

Input 1 Level Select Mic-Phantom Pwr, Mic, Line
Input 2 Level Select +10dBu/-10dBu

+10dBu

-10dBu

Female XLR-1/4" Combo Connector 2/Tip 3/Ring 1/Sleeve
INPUT 1

Phono
INPUT 2

Test Tone Button

Front Panel

OFF

Red LED

Phono
MIX OUTPUT

400Hz
TEST TONE

Quick Reference

Front Panel: Controls & Displays

Adjust audio input levels of Input 1 and Input 2 here. See page 10 for more information.

Indicates audio input level of Input 1 and Input 2.

Indicates Process Mode is active.
Indicates Super Quiet mode is Shows mixed active. audio level.

Top mount antenna connection: Remove rubber plug and screw antenna in place.

LCD: Shows which channel is selected.

Monitor Port: Plug in a headset and adjust volume.

Power ON / OFF

Test Tone: Activates a tone to aid system setup.

Mix Level: Adjust so the Mix Level meter occasionally lights the red LED.

Contour: Equalization adjustment. Turn counter-clockwise for voice and clockwise for music.

Channel Select Up: Press for 3 seconds to lock on current channel.

Channel Select Down: Press for 8 seconds to enter program mode. See page 7 for more information.

Back Panel: Connections & Settings

Remote Antenna Connection: See page 22 or the Listen website for details on antennas that can be attached here.

Mix Output: These connectors contain a mix of Input 1 and Input 2. They are unbalanced phono connectors; and the output level is -10dBu.

Input 2: Set switch to match the level of your Input 2 audio source, not used to increase or decrease level by +10dBu.

Input 1: Used for balanced connection of a microphone or line level input. This combination connector accepts either XLR or ¼" phono plugs.

Set RF Power level here (¼, ½, and Full). See page 8 for guidelines on setting power levels.

The Listen LA-207 power supply connects here.

Input 2: Connect unbalanced audio to these phono connectors, input level -10dBu or +10dBu.

Select Line, Mic or Mic+Phantom Power. Line is balanced 0 dBu input level, Mic is -55dBu, +12VDC supplied in PH Power position. If not using input 1, leave in line position.
5

Setup Instructions
1 Unpack the Product Remove outer packaging and plastic cover. Inspect for physical damage.
2 Mount in Rack (if necessary) If rack mounting the unit, install the optional rack mount kit (part LA-326) according to the instructions included with the kit, then install the LT-800/LT-803 in the rack.
NOTE: If rack mounting, you will need to use a rear connection antenna.

Rack Mount with dual unit installed

Rack Mount with single unit installed Shown with LT-800/LT-803.

3 Connect Antenna Connect the antenna (not included) according to the installation instructions. Only use an antenna supplied by Listen. If you are connecting the antenna directly to the top of the LT-800/LT-803, you will need to remove the rubber plug on top of the unit. If you are using a remote antenna connected to the rear of the unit, do not connect an antenna to the top connector. See page 22 for antenna options, or refer to the Listen website for remote antenna options, www.listentech.com.
Coax antenna connection. Rear of LT-800/LT-803 shown.

LA-122 Remote Antenna See RF Reception Maximization Strategies and Coaxial Cable on page 12.
4 Connect Power Plug the power supply into the power connector on the back panel, then plug the power supply into an outlet. Only use a Listen approved power supply (the LA-207, an in-line switching power supply, is the approved power supply for this unit).

Rubber Plug LT-800/LT-803 shown with top mount antenna connected through top of unit (part numbers LA-101, LA-106 (72 MHz) or LA-102 (216 MHz)
12 VDC 1.3 A

5 Select Phonak Compatibility (if necessary) If you will be using Phonak receivers with your LT-800 (216 MHz only), the transmitter can become completely compatible through software control. When switched to this mode, the LT-800 transmitter will display the Phonak channels. By integrating Phonak channels and compatibility into the LT-800-216, it is more convenient to use Phonak receivers with Listen transmitters. (www.phonak.com)
6

Setup Instructions (cont.)
To Select Phonak Mode (LT-800 only): Press and hold down the channel select "up" button while powering on the unit. The LCD will display a "P" momentarily upon power up indicating that the transmitter is in the Phonak Channel Mode. The channels displayed will now match Phonak channels. To return to the Listen channel designations, repeat this process. The LCD will display an "L" momentarily upon power up indicating that you are in the Listen Channel Mode.

6 Select Channel Mode (if necessary) Your transmitter has been shipped to you with only a limited number of channels available (Basic Mode). If all channels (Expanded Mode) are required, use the following procedure.
To Select Expanded Mode (LT-800 only): To enable or disable the Expanded Mode, press and hold the channel select "down" button while powering on the unit. When the Basic Mode is enabled, "L/O" (lockout) will be displayed on the LCD display as shown below. This indicator is extinguished when in the Expanded Mode.
7 Set SQ (Super Quiet) and Process Features (SQ available on LT-800 only): Your transmitter is shipped to you with SQ (super quiet) enabled and Process disabled. For a detailed description of these features and when to use them, please refer to page 11.
To Disable or Enable SQ and Process Features: With the unit on press and hold the channel select "Down" button for 8 seconds. The program (PGM) icon will appear on the LCD.
Once in the program mode,
Program icon
the SQ and process features can be turned on and off by pressing the channel select buttons. Press the channel select "Up" button to toggle between Process On and Off. Press the channel select "Down" button to toggle between SQ On and Off.
LED lit when Process is enabled

If the green LED is illuminated on the front panel, that feature is enabled. Once you have enabled or disabled the features as desired, let the transmitter exit the program mode by waiting 5 seconds.

LED lit when SQ is enabled

Setup Instructions (cont.)

8 Set RF Power Set the RF POWER switch on the back of the unit to Full, 1/2 or 1/4 (Level is indicated on the LCD display). The amount of transmitted RF power that you will need depends on your application. If you are operating multiple transmitters in the same environment, it is best to set the transmitters output power to its lowest level to reduce the possibility of interference.

Full power

12 VDC 1.3 A
Back of LT-800 unit

1/2 power
1/4 power

9 Connect Audio Inputs The LT-800/LT-803 has two audio input options: Input 1 and Input 2. Input 1 is a balanced connection using either an XLR or 1/4" phono connector. Input 2 has two unbalanced mixing phono connectors. Use Input 1 if you are using a microphone or if you have a balanced connection such as from a professional audio mixer (you can also use Input 1 for unbalanced connections). Use Input 2 to connect to an unbalanced audio source.

Input 1

Connect the audio source(s) to one or both audio input

connections. Input 1 offers a choice of

Line

balanced XLR or 1/4" phono connector.

Back of LT-800/LT-803 with XLR connected to Input 1

Plug your microphone into Input 1 and move

Mic

the input select switch to Mic (for dynamic

microphones) or Mic + PH Power (for condenser

microphones).

Mic with Phantom

12 VDC 1.3 A

Plug your balanced or unbalanced audio source into

Power

Input 1. Use the following diagram.

XLR Wiring

1/4" Phone Wiring

- +

Input 2 Plug your unbalanced audio source into Input 2 and select the audio level switch for -10dBu or +10dBu, to match the audio level coming from your equipment.
8

Operating Instructions
1 Power Unit On Turn power on by pressing the power button.
2 Select a Channel Select the transmit channel by pressing the channel select UP and DOWN buttons. See Channel Selection on page 13 for more information.
Channel Select UP and DOWN buttons
NOTE: The LT-800 is shipped with only limited channels (Basic Mode). To select from all channels (Expanded Mode) refer to page 11 (for a more detailed
description of Basic and Expanded Mode refer to page 11).
3 Lock on Channel Once you determine your transmit channel, you can lock the transmitter on that channel. To lock a channel hold the Channel Select "Up" button for 3 seconds until the padlock icon appears on the display. To unlock, repeat this process and the padlock icon will disappear.
Lock icon
4 Test Tone (if necessary) To broadcast a test tone, press the test tone button. This helps to test receivers when no audio source is available.
Press Test Tone button here
9

Audio Control
1 Adjust Audio Input Level Adjust the input knob counterclockwise to add gain to Input 1. This will decrease gain to Input 2. Adjust input knob clockwise to add gain to Input 2. This will decrease gain to Input 1. If you have two audio sources connected to both Input 1 and 2, adjust the level of one input using the VU meter, then adjust the output level of the other audio source. Adjust the input level until the left VU meter(s) occasionally illuminate the red LEDs. Illumination of the red LEDs indicates the unit is in limiting. Limiting is required so that the unit does not over-modulate the transmitter. If you don't want any audio limiting to occur, make sure the red LEDs never illuminate. If you want a highly limited signal, turn the audio gain up so the red LEDs illuminate often.
2 Adjust Contour Adjust the Contour knob counterclockwise if your audio source is mostly voice. Adjust the knob clockwise if your audio source is mostly music. The Contour knob adjusts the relative equalization of the unit. This equalization boosts or cuts frequencies above 5 kHz.
3 Adjust Mix Level Adjust the mix level until the right VU meter occasionally illuminates the red LED. This is the level adjustment for the combined output from Input 1 and Input 2. If you are using another manufacturers' receivers with the LT-800/LT-803, determine the frequency of their receivers then refer to Listen's Frequency Compatibility Tables (pages 14-15) to find the Listen channel that corresponds with the receiver's frequency. We recommend verifying corresponding channel designations on these tables to ensure compatibility and provide the best possible reception. The LT-800-216 is Phonak compatible and can be set to display Phonak specific channels. See page 7 to set Channel Mode and page 13 for specific channel designations.
10

Listen SQTM (Super Quiet) - Improving Your Listening Experience

People are accustomed to listening to low noise, high fidelity audio (delivered via CD, DVD, etc.). FM radio systems, such as those made by Listen, have more inherent noise compared to most sound systems. To minimize noise, Listen uses a noise reduction technology called Listen SQTM. Both the transmitter and receiver must have the SQ feature enabled to achieve the desired results. SQ is available on new Listen systems, including the LT-800 system. If you are planning to use this product with older Listen systems that do not have Listen SQ, or equipment not manufactured by Listen, you must disable Listen SQ.
Your Listen LT-800 has been shipped to you with the SQ feature enabled. You may need to disable the SQ function for one or more of the following reasons:
· You are using your new Listen LT-800 with older version Listen receivers that do not have the SQ function.
· You are using your new Listen LT-800 with equipment supplied by other manufacturers (Listen is the only manufacturer using SQ Technology).
· You expect that end users will bring and use their own receivers that don't have the SQ function.
NOTE: See page 7 to enable or disable SQ(Super Quiet).

SQ Summary
· SQ is NOT squelch
· SQ improves noise performance by at least 20dB
· SQ is NOT compatible with older version Listen products
· SQ is NOT compatible with other manufacturers' products
· To work properly, SQ must be enabled for both the transmitter and receivers
· SQ can be disabled to permit operation with older Listen products or other manufacturers' products

Process Mode
Process mode is used for Audio Gain Control (AGC). With the process mode enabled, the LT-800 will automatically adjust for inconsistent signal input levels by raising or lowering the signal level accordingly to provide a consistent sound output level. This feature should be used in applications where a consistent sound level is important and the input levels vary substantially. Typically you would not want to engage the Process Mode when a speaker's emphasis is critical to the message they are conveying.
Basic and Expanded Mode (LT-800 only)
In the default Listen channel mode, only the most commonly used channels are available. This is called "Basic Mode". When the LT-800 is in Basic Mode, "L/O" (lock-out) will be displayed on the LCD, meaning some transmission channels are unavailable.
If the channel needed is not available in Basic Mode, access to all transmission channels is achieved in "Expanded Mode".
To access Expanded Mode press and hold the channel select "down" button while powering on the unit. To return to Basic Mode, repeat the same process of powering on the unit while holding the "down" button.

RF Reception Maximization Strategies
For proper and dependable operation, Listen receivers need to receive a strong and consistent signal from the originating transmitter. Note that on portable receivers the headset wire is the receiving antenna. The following strategies should be used maximize this signal:
1. When designing and installing your system, keep in mind that the location of both the transmitting and receiving antennas is critical to maximize broadcast range.
2. Eliminate or minimize obstructions between the transmitting and receiving antenna. 3. Minimize the distance between the transmitting and receiving antennas. 4. Move transmitting and receiving antennas away from metal or conductive objects. 5. Place the transmitting antenna as high as possible. 6. Orient both transmitting and receiving antennas vertically. 7. Position the RF Power switch on the back of the LT-800 to full RF Power, unless lower power is necessary
(see page 8). 8. Keep coaxial cable from transmitter to antenna as short as possible.
CAUTION: When installing antennas, ensure the antenna is clear of power lines.
Coaxial cable, connectors, and optional antenna mounting kits are available from Listen. See page 22, visit www.listentech.com, or ask your dealer for details.
Coaxial Cable
The antenna for the LT-800/LT-803 can be mounted directly on the unit if desired. However, you may find that the unit will provide better performance when the antenna is located elsewhere. If you plan to mount the antenna in a different location other than the top of the unit, you must use cable and connectors rated at 50 ohms. Although cable used for cable TV installations looks similar to this cable, it will not work with your Listen system. If you need to run cable over a length greater than 50 feet for 216 MHz applications or greater than 100 feet for 72 MHz applications or to maximize broadcast range, Listen recommends that you use RG-8 cable rather than RG-58. RG-8 is a lower loss cable, meaning that more of your signal will reach the antenna. Long cable runs can result in signal degradation due to the "loss" characteristics of the cable. When using RG-58 with a 72 MHz transmitter, there is an average* loss of 4 dB per 100 feet of cable and at 216 MHz using RG-58 an average* loss of 8 dB per 100 feet of cable. (A 3dB loss means half of your power has been lost.) However, it is better to suffer coaxial power loss than to try to shoot your signal through obstacles! Obstacles, especially metal, can create drop-outs or reflections of your signal that will result in poor listening conditions. *NOTE: There are many varieties of 50 ohm, RG-58 and RG-8 cables. You may purchase a
cable that is better or worse than this value. Please check with the cable vendor or manufacturer for exact specifications.
12

Channel Selection

It is important to choose channels that are free from interference to achieve proper operation of your Listen equipment. This process is trial and error. Before turning on the transmitter, listen to the wide band channels on the receivers (lettered channels at 72 MHz and channels that start with a "2" for 216 MHz when using a Listen receiver). Listen to the audio through the headphone or via the speaker and choose a channel with the least amount of interference. Unless you are interfacing with an existing narrowband transmission system, always use a wide band channel.
If you are using multiple channels follow this process:
1. Same Space If you are using multiple transmitters in the same space, the highest number of channels that will work simultaneously is six at 72 MHz and three at 216 MHz. With all of the transmitters off, listen for interference on all the wide band channels with a Listen receiver. Using the frequency compatibility tables on pages 14-16, eliminate any channels that have noticeable interference. Now choose the channels with the widest channel spacing. It is recommended that adjacent channels be spaced at least 300k Hz apart. If there is no interference the following channels are recommended. For a 72 MHz system, use channels A, C, E, I, J and H. For a 216 MHz system, use channels 2A, 2K and 2V.
2. Distributed Spacing If you are using transmitters that are distributed over a large area, you can achieve more simultaneous broadcast channels. However, it is critical that your receiver(s) be located as close to its transmitter as possible. You can use adjacent channels (see frequency compatibility tables (on pages 14-16) in this case as long as the adjacent channel transmitter is at least 50% further away from the receiver than the original transmitter. Example: The transmitter for the receiver on channel E is 100 feet from the receiver. The adjacent channel transmitter on channel D should be at least 150 feet away.
It is highly recommended that after channel selection has been achieved, you lock the channel so that it cannot be changed by the user. To accomplish LOCK on the LT-800/LT-803, press the "UP" button for 3 seconds. Repeat the process to unlock.
Notes in regard to using 72 MHz and 216 MHz systems:
1. 72 MHz is a secondary frequency band. This means that other transmitters are licensed to use these frequencies. Thus, you may experience interference from paging transmitters and other types of transmissions. You will need to find a clear channel by listening to all the wide band channels.
2. 216 MHz is a primary frequency band and no other types of transmissions are authorized to use it. Thus, you will find the highest probability of clear channels in this band. However, you may experience intermodulation of the TV Channel 13 aural carrier if there is a channel 13 transmitter in your area and you are close to the transmitter. If you cannot find a clear channel in 216 MHz band due to channel 13, it is recommended that you switch to a 72 MHz system.

Wide Band Recommendation Listen recommends that you always use a wide band channel unless you need to be compatible with existing narrow band receivers from other manufacturers. Wide band channels have lower noise than their narrow band counterparts.
At 72MHz The LT-800 at 72 MHz operates on 17 wide band channels and 40 narrow band channels.
· Letters= Wide Band Channels (Example: E)
· Numbers= Narrow Band Channels (Example: 32)
At 216MHz The LT-800 at 216 MHz operates on 19 wide band channels and 38 narrow band channels.
· "2" as left digit= Wide Band Channel (Example: 2C)
· "1" and "3" as left digits= Narrow Band Channels (Examples: 1A; 3R)

72 MHz Compatibility Chart
Wideband frequencies are indicated in highlighted rows. The highlighted channels also indicated those channels available in the "basic" mode (default). All channels can be accessed when in the "expanded" channel mode (see page 7 for more information). *Parenthesis indicate T35 and T20 narrowband.
14

216 MHz Compatibility Chart

Frequency

Phonic

MHz

Listen

Ear

Comtek Phonak Williams Gentner CSI

216.0125

216.0250

216.0375

216.0625

216.0750

216.0875

216.1125

216.1250

216.1375

216.1625

216.1750

216.1875

216.2125

216.2250

216.2375

216.2625

216.2750

216.2875

216.3125

216.3250

216.3375

216.3625

216.3750

216.3875

216.4125

216.4250

216.4375

216.5125

216.5250

216.5375

216.5625

216.5750

216.5875

216.6125

216.6250

216.6375

216.6625

216.6750

216.6875

216.7125

216.7250

216.7375

216.7625

216.7750

216.7875

216.8125

216.8250

216.8375

216.8625

216.8750

216.8875

216.9125

216.9250

216.9375

216.9625

216.9750

216.9875

AVR C01

Light Speed
N01

C05

C09

N09

C12

N12

C18

N18

C21

C24

N64

C25

C29

C32

N72

C33

C37

N77

C39

C40

N80

Wideband frequencies are indicated in highlighted rows. The highlighted channels also indicated those channels available in the "basic" mode (default). All channels can be accessed when in the "expanded" channel mode (see page 7 for more information).

Phonak Frequency Chart

Frequency (MHz)
216.012 216.025 216.037 216.062 216.075 216.088 216.113 216.125 216.137 216.162 216.175 216.188 216.213 216.225 216.238 216.262 216.275 216.287 216.312 216.325 216.338 216.363 216.375 216.387 216.412 216.425 216.438 216.512 216.525 216.537 216.562 216.575 216.588 216.613 216.625 216.637 216.662 216.675 216.688 216.713 216.725 216.738 216.762 216.775 216.787 216.812 216.825 216.838 216.863 216.875 216.887 216.912 216.925 216.938 216.963 216.975 216.988
16

Listen
1A 2A 3A 1B 2B 3B 1C 2C 3C 1D 2D 3D 1E 2E 3E 1F 2F 3F 1G 2G 3G 1H 2H 3H 1J 2J 3J 1K 2K 3K 1L 2L 3L 1M 2M 3M 1N 2N 3N 1P 2P 3P 1R 2R 3R 1S 2S 3S 1T 2T 3T 1U 2U 3U 1V 2V 3V

Phonak
1 41 2 21 42 4 5 43 22 23 44 8 9 45 24 25 46 12 13 47 26 27 48 16 17 49 18 61 29 62 28 52 64 65 53 81 82 54 68 69 55 83 84 56 72 73 57 76 85 58 86 77 59 88 79 60 80

Troubleshooting
Troubleshooting
The LT-800/LT-803 has no power. Make sure the LA-207 power supply is connected to a power source and is connected to the jack marked "Power Input". Make sure the POWER button is pressed in.
There is no audio or the audio level is too low. Make sure that your audio source is properly connected to Input 1 and/or Input 2. The Input 1 or Input 2 switches must be in the correct position for the appropriate input level. For example: if you are using the output of a mixer on Input 2, the switch should be in the -10dBu position. If it were to be in the +10dBu position, the level would be too low. Also, check the Input knob to ensure it is properly adjusted. You should be able to see the VU meter deflect on Input 1 or Input 2 corresponding with the input level of the audio source. You can listen to the audio source by connecting a headset to the front panel jack and adjusting the Monitor volume control.
If the level of audio into the transmitter is low and can't be corrected using the level input switches, the audio processor can be turned on to boost the signal (see page 7 to set, page 11 for description of Process Mode).
The audio is distorted. Check to make sure you have the input level select switches in the proper position. You may be providing too much audio level for the input stage to handle. Make sure the SQ mode is set correctly on both the LT-800 and the receivers you are using. If your receivers do not have SQ, make sure the SQ mode is turned off (see page 7).
There is hum in the audio. Make sure you have properly grounded the audio source to the LT-800/LT-803. Check the connections from the audio source to the LT-800/LT-803. If you can, try to use a balanced audio source - this will reduce the chance of creating hum. Connect a ground wire from the LT-800/LT-803 to ground and/or to the ground of the source audio.
There is a tone. The Test Tone button has been pressed (its LED light is on). Push the Test Tone button to turn off the tone.
The Audio Input 1 sounds "tinny". If you are using an unbalanced audio source, make sure Pin 3 on the XLR or the ring on the ¼" plug is grounded (see page 8).
I cannot pick up the signal on the receiver. Check to make sure the receiver and the transmitter are using the same frequency band (i.e. 72 MHz or 216 MHz) and that they are on the same channel. Make sure the LT-800 has an antenna connected. Ensure that the receiver has an antenna (for portable products the headset is the receiving antenna).
I can pick up the signal on the receiver, but it sounds like it's not tuned in. Check to make sure the transmitter and receiver are on exactly the same channel. It's a good idea to lock the channels once they have been set. To lock the LT-800/LT-803, press the UP button for 3 seconds (see page 9).
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Troubleshooting (cont.)
Troubleshooting
I'm using another brand of receiver - how do I tell which channel to use? Refer to Listen's Frequency Compatibility Tables (pages 14-16). Adjust Listen's transmitter to the same frequency as the other major brand. Since Listen products can access 57 channels, they will most likely receive on the same fixed channel or channels of other major brands. If you are using another brand of receiver, make sure you have turned off the SQ feature on the Listen product(s).
There is not sufficient range. First make sure that the receivers you are using are operating properly, then make sure that you have an antenna connected either to the top of the LT-800/LT-803 transmitter or connected to the back of the unit (but not both!). The antenna should be as high as possible and free of obstacles. In addition make sure you are using the correct antenna type for your unit. You might want to use a remote antenna (provided by Listen) that can be mounted on a mast or wall. Try using different frequencies to find one with less interference.
There is interference in my transmission. Ensure that the transmitter and receivers are on the same channel. Verify that there are no other transmitters on the same channel or a close channel to the one exhibiting interference. Try different channels until you find a clear channel. If this does not work, try a different frequency band (i.e. if you are using 72 MHz, try 216 MHz or vice versa). Please contact Listen support for assistance and a return authorization (RMA) number to exchange product for alternate frequency equipment.
End users are adjusting the unit. First, lock the channel by pressing and holding the channel select UP button for 3 seconds. Consider removing the Input, Mix Level and Contour knobs. You can order a rack mount kit from Listen which offers a security cover that will limit access to the unit.
I am using other manufacturers' receivers and the sound is distorted. The receiver is probably not designed to handle the +25 kHz deviation of the Listen transmitter. This can be corrected by turning the Mix Level knob down. Another possibility is that you have enabled the SQ function of the LT-800, and this feature is not available in other companies' products. You will need to disable SQ in this event (see page 7). If you are using Phonak receivers, the transmitter is capable of operating in the Phonak mode (please refer to page 7).
Several transmitters are operating in the same environment. For this, you'll need to choose your transmitting frequencies carefully. See page 14-16 for more details.
Can I have two antennas connected to my transmitter? No. The LT-800/LT-803 transmitter can use only one antenna connection at a time. You may connect either a top mount antenna through the top antenna port, or a remote antenna connected to the BNC connection on the rear of the unit. If multiple antennae are simultaneously connected to both ports the transmitter will have extremely poor broadcast performance and range.
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Compliance Notice & FCC Statement
LT-800/803 Compliance Notice
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) These devices may not cause harmful interference, and (2) these devices must accept any interference received, including interference that may cause undesirable operation.
Listen's LT-800 Transmitter (216 MHz only) Listen's LT-800 transmitter is authorized by rule under the Low Power Radio Service (47 C.F.R. Part 95) and must not cause harmful interference to TV reception or United States Navy SPASUR installations. You do not need an FCC license to operate these transmitters. These transmitters may only be used to provide: auditory assistance to persons with disabilities, persons who require language translation, or persons in educational settings; health care services to the ill; law enforcement tracking services under agreement with a law enforcement agency; or automated maritime telecommunications system (AMTS) network control communications. Two-way voice communications and all other types of uses not mentioned above are expressly prohibited.
This device must be installed by a trained audio professional or certified dealer of Listen. The user can't make any modifications to the unit without expressed written consent of Listen Technologies Corporation. Any modifications made will void the FCC compliance, Listen warranty and the users authority to operate Listen's equipment.
LT-800/803 FCC Statement
This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
· Reorient or relocate the receiving antenna. · Increase the separation between the equipment and receiver. · Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. · Consult the dealer or an experienced radio/TV technician for help. This equipment has been certified to comply with the limits for a class B computing device, pursuant to FCC and IC Rules. In order to maintain compliance with FCC and IC regulations, shielded cables must be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV reception. The user is cautioned that changes and modifications made to the equipment without the approval of manufacturer could void the user's authority to operate this equipment.
19

Industry Canada Statement
LT-800/803 Industry Canada Statement
This device complies with ISED Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:
1. This device may not cause interference, and 2. This device must accept any interference, including interference that may cause undesired operation of
the device. Le présent appareil est conforme aux CNR d'ISDE Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes:
1. l'appareil ne doit pas produire de brouillage; 2. l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en
compromettre le fonctionnement. This equipment complies with FCC and IC RSS-102 radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. Énoncé d'exposition aux rayonnements: Cet équipement estconforme aux limites d'exposition aux rayonnements ioniques RSS-102 Pour un environnement incontrôlé. Cet équipement doitêtre installé et utilisé avec un Distance minimale de 20 cm entrele radiateur et votre corps.
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Warranty & Contacting Listen
Warranty
Listen Technologies products are designed and engineered to provide long-standing use for many years. Listen Technologies warrants all products against defects in materials and workmanship. All product warranties can be transferred, in the event product is transferred the warranty is valid from the original date of the product purchase. Listen shall bear no responsibility or obligation with respect to the manner of use of any equipment sold. Listen specifically disclaims and negates any warranty of merchantability or fitness of use of such equipment including, without limitation, any warranty that the use of such equipment for any purpose will comply with applicable laws and regulations. The terms of the warranty are governed by the laws of the state of Utah, USA. Warranty does not include normal wear and tear on the product. In addition, Listen Technologies is not liable for consequential damages due to any failure of equipment to perform as intended. Listen stands by the quality of its manufactured products and will, at its own discretion, repair or replace any defective products. All product warranties are subject to change without notice. For product-specific warranty information visit, https://www.listentech.com/support/warranty/.
Contacting Listen
If technical service is needed, please contact Listen. Pre-authorization is required before returning Listen products. If products were damaged in shipment, please contact the carrier, then contact Listen for replacement or repair requirements payable by the carrier. Listen's corporate headquarters are located in Bluffdale, Utah U.S.A. and are open Monday through Friday, 8am to 5pm mountain time. 14912 Heritage Crest Way Bluffdale, Utah 84065-4818 +1.801.233.8992 | 1.800.330.0891 Toll Free (USA & Canada) +1.801.233.8995 fax support@listentech.com www.listentech.com
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Accessories

Antenna Accessories

LA-101 Helical Top Mounted Antenna
(72 MHz)

LA-102 Telescoping Top Mounted Antenna
(216 MHz)

LA-106 Telescoping Top Mounted Antenna
(72 MHz)

LA-107 Ground Plane Remote Antenna
(216 MHz)

LA-122 Universal Antenna Kit
The single solution for all of your indoor remote antenna needs. Includes: 72 and 216 MHz components; flexible and rigid dipoles and monopole radials; hardware for multiple mounting configurations; and 25 feet (7.6m) of
RG-58 coax cable.

RRaacckk MMoouunntt AAcccceessssoorriieess

LA-123 90° Helical Antenna
(72 MHz)
LA-124 90° Helical Antenna
(216 MHz)

LA-125 (72 MHz) and LA-126 (216 MHz) Antenna Kit for Rack Mount
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LA-326 Universal Rack Mounting Kit
Includes components for single and dual rack configuration and a security cover.
NOTE: Rack mounted units cannot use the LA-106, LA-102 or LA-101 top mounted antenna.

LISTEN TECHNOLOGIES 14912 Heritage Crest Way, Bluffdale, Utah 84065-4818 USA Phone: +1.801.233.8992 | Toll-Free: 1.800.330.0891 | www.listentech.com
Copyright © 1998 - 2023 Listen Technologies Corporation®. All rights reserved. 20231115.

References

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