Listen lt-800 User manual

Brand: Listen

Model: lt-800

Category: Wall transmitters

Type: User manual

This manual is also suitable for

LISTEN

TECHNOLOGIES

CORPORATION

User’s Manual

LT-800 Stationary Transmitter

LT-700 Portable Transmitter

LR-500 Programmable Display Receiver

LR-400 Display Receiver

LR-300 Digital Receiver

LR-100 Stationary Receiver / Power Amplifier

This Manual is for Both 72 and 216MHz Systems

Now with

Listen SQ!

See page 5

What’s New -

page 2

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Dear VDear V

Dear V

alued Customeralued Customer

alued Customer

Thank you for choosing Listen! All of us at Listen are

dedicated to providing you the highest quality

products and prompt, efficient customer care. Our

products are manufactured in an ISO-9000 factory

that has been independently certified to the highest

quality standards. We stand ready to answer any

questions you might have during installation or in the

operation of our products. Should there be any

problems with your Listen products, we are ready to

help you in any way we can. Should you have any

comments on how we might improve our products or

our service, we’re here to listen. Here’s how to reach

us:

Telephone: +1.801.233.8992

Fax: +1.801.233.8995

Toll Free (North America): 1.800.330.0891

E-Mail: support@ListenTech.com

Web: www.ListenTech.com

Thank you... and enjoy your listening experience!

Best regards,

The Listen Team

What’s New

LT-800

• SQ (see page 5) - increases clarity of signal

for a better listening experience

LT-700

• SQ (see page 5)

• Automatic Charging / Pulse Charging

• Reconditions Batteries

• Batteries are More Fully Charged

• Lock Function - prevents accidental

switching of channels in unit

• AGC function has been removed for more

stable gain performance

• Mic Sensitivity Switch - improves perfor-

mance of different types of microphones

• New MUTE function - only the mic is muted;

the line input is not muted when activated.

Receivers

• SQ (see page 5)

• Flashing LED Lock Indication for LR-300 -

when locked and a channel button is

pressed, the LED flashes to let you know the

channel is locked

• Pulse Charging

• Reconditions Batteries

• Batteries are More Fully Charged

• NEW LR-100 Stationary Receiver / Power

Amplifier

• Transmit high quality audio without

wires up to 3,000 feet

• Use with Listen transmitters for

auditory assistance and ADA

compliance

• Built-in 44 Watt Power Amplifier

Welcome to Listen!

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Table of Contents

What’s New ............................................................. 2

Technical Service Contacts ..................................... 4

Compliance Notices ................................................. 4

Listen SQ

- Improving Your Listening Experience ... 5

Listen Warranty ........................................................ 6

LT-800 Stationary Transmitter

Quick Reference ......................................................... 7

Preparing the LT-800 for Use ..................................... 8

Operating the LT-800 ................................................. 10

Selecting a Channel For Transmitting ........................ 10

LT-800 Stationary Transmitter Specifications ............ 11

LT-800 Troubleshooting .............................................. 12

LT-700 Portable Transmitter

Quick Reference ......................................................... 13

Preparing the LT-700 for Use ..................................... 14

Operating the LT-700 Transmitter .............................. 16

LT-700 Look & Listen

Display Descriptions ............. 17

LT-700 Programming .................................................. 18

Charging Batteries ..................................................... 18

Operating the LT-700 With a Wall Transformer ......... 19

LT-700 Portable Transmitter Troubleshooting ............ 20

LT-700 Portable Transmitter Specifications ............... 21

Listen Portable Receivers

Differences in the LR-300, LR-400 and LR-500 ......... 22

Preparing Listen Receivers for Use ............................ 22

Operating Listen Receivers ........................................ 24

Display Receivers - Look & Listen

Display .............. 26

Charging Batteries in Portable Receivers .................. 27

LR-500 Programming ................................................. 28

Listen Portable Receiver Troubleshooting .................. 29

Listen Portable Receiver Specifications ..................... 30

LR-100 Stationary Receiver / Power Amplifier

Quick Reference ...................................................... 31

Preparing the LR-100 For Use ................................. 33

LR-100 Setup and Programming ............................. 36

LR-100 Troubleshooting .......................................... 38

72MHz Frequency Compatibility Table ................. 39

216MHz Frequency Compatibility Table .............. 41

Appendix A - Which channel(s) should I use? ....... 43

Appendix B - Strategies For Maximizing RF

Reception With Listen Products ............................. 44

Appendix C - A Note on Coaxial Cable ................... 44

Appendix D - Resetting After an Overload Condition 45

Table of Contents

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Technical Service Contacts

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.

Toll Free: 1.800.330.0891

Telephone: +1.801.233.8992

Fax: +1.801.233.8995

Internet: www.ListenTech.com

General E-Mail: info@ListenTech.com

Shipping & Correspondence Address:

Listen Technologies Corporation

8535 South 700 West, Suite A

Sandy, Utah 84070-2515 U.S.A.

Compliance ID Numbers:

FCCFCC

FCC= Federal Communications Commission, U.S.

ICIC

IC= Industry Canada

LT-800-072 (72MHz base transmitter)

FCC: OMD800-001 IC: 4011104404

LT-800-216 (216MHz base transmitter)

FCC: OMD800-216 IC: 4011104346

LT-700-072 (72MHz portable transmitter)

FCC: OMD700-001 IC: 4011104344

LT-700-216 (216MHz portable transmitter)

FCC: OMD700-216 IC: 4011104345

All receivers:

FCC: N/A IC: 4011104425A

Compliance NoticesCompliance Notices

Compliance Notices

ListenListen

Listen

’s Models L’s Models L

’s Models L

-800, L-800, L

-800, L

-700, LR-100, LR-300, LR-400 and LR-500-700, LR-100, LR-300, LR-400 and LR-500

-700, LR-100, LR-300, LR-400 and LR-500

These devices comply 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.

ListenListen

Listen

’s L’s L

’s L

-800 and L-800 and L

-800 and L

-700 T-700 T

-700 T

ransmitters (216MHz only)ransmitters (216MHz only)

ransmitters (216MHz only)

Listen’s LT-800 and LT-700 transmitters are 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.

Caution: Changes or modifications not expressly approved by the party

responsible for compliance could void the user’s authority to operate Listen’s

equipment.

FCC StatementFCC Statement

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.

Technical Service Contacts & Compliance Notices

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Listen SQ

- Improving Your Listening Experience

SQ - A Listen Exclusive

What is SQ?

We are accustomed to listening to low noise, high fidelity audio (delivered via CD, DVD, etc.). FM radio systems, such as

those made by Listen, are inherently noisy compared to most sound systems. To reduce noise of our systems, Listen now

offers a noise reduction technology called ListenSQ

. Both the transmitter and receiver must have SQ on to achieve the

desired results. SQ is now available on new Listen systems, including the system you received in this shipment. If you are

planning to use this product with older Listen systems or equipment not manufactured by Listen, you should disable SQ.

SQ Summary

• 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

Your Listen equipment 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:

1. You are using your new Listen system with older version Listen equipment that does not have the SQ function.

2. You are using your new Listen system with equipment supplied by other manufacturers.

3. You expect that end users may bring and use their own receivers that don’t have the SQ function.

For information on enabling / disabling the SQ function for specific products, refer to the following pages:

LT-800: Page 8

LT-700: Page 14

LR-300: Page 23

LR-400: Page 23

LR-500: Page 23

LR-100: Page 31

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Listen Technologies Corporation (Listen) warrants its

transmitters and receivers (LT-700, LT-800, LR-100, LR-300,

LR-400, LR-500, LR-600, etc.) to be free from defects in

workmanship and material under normal use and conditions

for the useful lifetime of the product from date of purchase.

All other products and accessories are warranted for ninety

days from date of purchase. This warranty is only available to

the original end purchaser of the product and cannot be

transferred. Warranty is only valid if warranty card has been

returned within 90 days of purchase. This warranty is void if

damage occurred because of misuse or if the product has

been repaired or modified by anyone other than a factory

authorized service technician. Warranty does not cover

normal wear and tear on the product or any other physical

damage unless the damage was the result of a manufacturing

defect. Listen is not liable for consequential damages due to

any failure of equipment to perform as intended. Listen shall

bear no responsibility or obligation with respect to the

manner of use of any equipment sold by it. 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 regula-

tions. The terms of the warranty are governed by the laws of

the state of Utah.

Listen will only accept returned products with prepaid

shipping and with a return authorization number. To receive a

return authorization number call 1.800.330.0891 or

+1.801.233.8992. Listen will refund the purchase price of

the product to the original purchaser within the first ninety

days after purchase if the product does not perform better

than a similar competitive product subject to an annual

amount to any one original purchaser not to exceed $1,000

and subject to the conditions of this limited warranty. This is

called our Whatever-it-takes Performance Guarantee. Refunds

will only be given to the original purchaser of product once

the product has been returned to the factory in good working

order with an explanation for the refund. To receive a refund,

call Listen for a return authorization number. Return the

product with a letter on the end user’s letterhead stating the

reason for the refund and a copy of the original invoice. If the

product was purchased through a dealer, refunds must be

processed through the original dealer.

In the first ninety days after purchase, any defective product

will be replaced with a new unit. After ninety days, Listen

will, at its own discretion either replace transmitters and

receivers with a new unit or a unit of similar type and

condition. Product that is not covered under warranty shall be

repaired or replaced with a unit of similar type and condition

based on a flat fee. Contact Listen for details.

This limited warranty, prices and the specifications of

products are subject to change without notice.

Listen Offers a Limited Lifetime Warranty, Including Performance Guarantee

Listen Warranty

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-800 Front Panel: Controls & Displays

LT-800 Rear Panel: Connections and Settings

Adjust audio input levels

of INPUT 1 and INPUT 2

here. See page 9 for

more information.

Indicates audio input

level of INPUT 1 and

INPUT 2

Shows MIX

Audio level

Indicates RF

output power (full,

1/2 or 1/4) - select

on rear panel (see

below)

Shows which

channel is

selected

If decimal is lit,

channel is

locked

Plug in a headset

and adjust its

volume

SELECT

CHANNEL

TO LOCK CHANNEL: press

UP and DOWN buttons

simultaneously and hold for

approx. 3 seconds. Press

both and hold again to unlock.

CONTOUR: Equalization

adjustment. Turn counter-

clockwise for voice and

clockwise for music.

MIX LEVEL: Adjust so

the VU meter

occasionally lights the

RED LED.

TEST TONE:

Activates a tone to

aid setting up a

system

Power ON / OFF

REMOTE ANTENNA

CONNECTION: See the

Listen website for details on

antennas that can be

attached here. You can

only use one antenna at a

time.

LT-800 Stationary Transmitter Quick Reference

Set RF Power level here (1/4, 1/2 and

Full). See page 7 for guidelines on

setting power levels.

The Listen LA-201

power supply

connects here.

AUDIO OUTPUT: This

connector contains a mix of

INPUT 1 and INPUT 2. This is

an unbalanced phono

connector; the output level is

-10dBu.

INPUT 2: This

unbalanced phono

connector is used to

connect an unbalanced

high impedance line or

speaker input.

Set switch to match your INPUT 2 source.

The level in the LINE position is -10dBu and in

the SPEAKER position, it is +10dBu.

INPUT 1: Used for balanced

connection of a microphone or

line level input. This

combination connector

accepts either XLR or 1/4”

phone plugs.

Select MIC or LINE input

here for INPUT 1. Mic input

level is -55dBu with 50 ohm

impedance; in the LINE

position, the input level is

+4dBu with an impedance

of 600 ohms.

Top antenna connection: Remove rubber plug and screw antenna in

place. You can only use one antenna at a time.

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Preparing the LT-800 for Use

Remove the product from the shipping

container and plastic cover.

Inspect for physical damage. See “Technical Service

Contacts” (Page 4) if damage has occurred.

Set SQ Switch:

See “What is SQ?” on Page 5. Remove the rubber

plug from the top of the unit. In a good light, locate

the SQ switch through the antenna opening in the top

of the unit. The switch will be located next to the

antenna connector inside the unit. Move the switch

toward the front of the unit to enable SQ; move the

switch toward the back of the unit to disable SQ.

Note: If you will be using your LNote: If you will be using your L

Note: If you will be using your L

-800 with receivers that-800 with receivers that

-800 with receivers that

do not have SQ capabilitydo not have SQ capability

do not have SQ capability

, do not enable SQ., do not enable SQ.

, do not enable SQ.

For rack mounting:

If rack mounting the unit, install the rack mount kit

according to the instructions that come with the kit,

then install the unit in the rack.

Connect power supply to unit:

Plug the connector on the power supply into the

power connector on the back panel. Do not connect

to AC power yet. (Only use a Listen supplied power

supply. The LA-201, an in-line transformer, is the

approved power supply for this unit.)

Enable Disabled

Front panel of

LT-800

Antenna

Opening

TOP VIEW OF LT-800: SQ SWITCH LOCATION

Connect antenna:

Connect the supplied antenna according to the

instructions that come with the antenna. Only use an

antenna supplied by Listen. If you are connecting the

antenna directly to the top of the LT-800, you will need

to remove the rubber plug on top of the unit first. If

you are using an optional remote antenna connected

to the rear of the unit, do not connect an antenna to

the top connector. See Appendix B and C for more

information, or refer to the Listen website for remote

antenna information.

Set the RF power:

Set the RF POWER switch for FULL, 1/2 or 1/4. (Level

is also indicated on the front panel.) The amount of

transmitted RF power that you will need depends on

your application. If you are operating other transmit-

ters in the same environment and receivers may be

used close to the antenna, it is best to have the

transmitter’s output power at its lowest level to

reduce the possibility of interference.

Power up:

a. Connect the LA-201 power supply to AC power.

b. Press the POWER button on the front panel.

c. Select the desired channel using the UP and

DOWN buttons.

d. If desired, lock in the selected channel by pressing

the UP and DOWN buttons simultaneously and

holding for 3 seconds.

LT-800 Stationary Transmitter Preparation

Antenna connects here

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Connect Audio Inputs:

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

connections. Input 1 offers a choice of balanced XLR

or 1/4” phone connection. Input 2 is an unbalanced

phono connector. (See LT-800 Rear Panel Connections

and Settings on page 6 for specific connection

instructions.)

Connect balanced and unbalanced audio sources as

shown in diagram. Make sure that if you are

connecting an unbalanced audio source, pin 3 of the

XLR and the ring of the 1/4” phone plug are connected

to ground as shown.

LT-800 Audio Control

Input levels can be viewed on the two VU meters on the

front panel.

Adjust input: Adjust the INPUT knob counterclock-

wise to add gain to INPUT 1. Adjust INPUT knob

clockwise to add gain to INPUT 2. 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 audio level so that the first VU meter does

NOT peak in the red.

Adjust Contour: Adjust the CONTOUR knob

counterclockwise if your audio source is mostly voice.

Adjust the knob clockwise if most of your audio

source is music. The CONTOUR knob adjusts the

relative equalization of the unit. This equalization

boosts or cuts frequencies above 5kHz.

Adjust Mix Level: Adjust the mix level knob so that

the audio level on the right VU meter occasionally

peaks red.

Adjust audio input switches: For Input 1 Switch,

select MIC or LINE input level; for Input 2 Switch,

select LINE (-10dBu) or speaker (+10dBu) level. (See

illustration on page 6.)

Use the headset jack to listen to audio source: With

the audio source or sources active and the unit

powered ON, plug a headset into the jack located on

the LT-800’s front panel to listen to the audio source.

Adjust headset volume to a comfortable level.

Input from

Balanced

Audio

Source

Balanced Unbalanced

Unbalanced

Audio

Source

- +

Audio from

Balanced

Audio

Source

Balanced

Unbalanced

Audio

Source

Tip

Ring

Sleeve

Tip

Ring

Ring/Sleeve

+ -

XLR Wiring

1/4” Phone Wiring

LT-800 Preparation; Audio Control

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Operating the LT-800

Selecting a Channel For Transmitting

Selecting a clear channel is important for interference-free

broadcasting.

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.

Compatibility with other manufacturers:

If you are using other manufacturers’ receivers with the LT-800, find

out their frequency then refer to Listen’s Frequency Compatibility

Tables (pages 39-42) to find the LT-800 channel number or letter that

corresponds with the receiver’s frequency. As much as possible,

Listen has duplicated the wide band channel letters to cover

frequencies of other major brands. However, we recommend

verifying corresponding channel numbers and letters on the tables on

pages 39-42.

If you are using other manufacturers’ receivers and

the sound is distorted, it is probably because the receiver is

not designed to handle the + 25kHz 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.

Several transmitters operating in the same environ-

ment:

For this, you’ll need to choose your transmitting frequencies carefully.

The following guidelines should be used to choose channels-

• If possible, use all wide band channels. These channels offer

lower noise.

• Select channels that have the highest frequency separation as

possible (see Frequency Compatibility Tables, pages 39-42), to

avoid adjacent channels and interference. Channels should be

at least 300kHz apart.

• Through a process of trial and error, select a combination of

channels that offer the lowest interference and highest

reliability.

Make sure the unit is powered on.

Press POWER button and verify power

connections. When “ON”, display should be lit.

Can’t change the channel? It may be locked. Press

both the UP and DOWN buttons simultaneously for 3

seconds until the decimal dot next to the channel

turns off. Press again to lock in a new channel, if

desired.

At 72MHz:

The LT-800 at 72MHz 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 216MHz 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)

UP and DOWN buttons

Please refer to the Frequency Compatibility Tables (pages

39-42) for specific frequencies and compatibility with other

manufacturers.

Test Tone, if necessary:

To broadcast a tone, press the test tone button. This

helps to test and tune receivers when no audio source

is available.

LT-800 Operation

Select a channel:

Select the transmit channel by pressing the channel

UP and DOWN buttons. See “Selecting a Channel for

Transmitting” to the right for more information.

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-800 Stationary Transmitter Specifications

RF Frequency Range:

72MHz: 72.05 - 75.95MHz

216MHz: 216.025 - 216.975MHz

Transmitter Stability:

50 PPM

Output Power:

72MHz: 8000uV at 3 meters

216MHz: 100mW (maximum allowed by the FCC)

Available Channels:

72MHz: 17 wide band, 40 narrow band

216MHz: 19 wide band, 38 narrow band

Power:

Primary - 115VAC, 60Hz, 19 Watts

Secondary - 15VAC, 1A (Listen LA-201 power supply)

RF Power Selection:

Full, 1/2, 1/4

Antenna:

Many antenna options are available, see Listen

website for details

Audio Frequency Response*:

72 MHz - 50Hz to 15kHz +/- 3dB

216MHz - 50Hz to 10kHz +/- 3dB

Signal to Noise Ratio*:

80dB with SQ enabled, 60dB (72MHz), 50dB (216MHz)

with SQ disabled

Distortion*:

<2% at 80% deviation

Audio Input 1:

F-XLR / 0.25 in Phone, 50 / 600 ohms, balanced -

55dBu / +4dBu, selectable, adjustable

Audio Input 2:

Phono, 10k ohms, unbalanced -10dBu / +20dBu,

selectable, adjustable

Audio Output (Mix):

Phono, 10k ohms, unbalanced, -10dBm

Earphone Output:

250mW, 32 Ohms, 3.5MM stereo

Controls:

Input Level, Mix Level, Contour, Headphone Level, Tone,

RF Power Output, ON/OFF

Visual Indicators:

Audio input levels 1, 2 and mix level; channel; RF

power, test tone

Physical Dimensions:

8 in (20.3 cm) W x 8 in (20.3 cm) D x 1.75 in (4.45

cm) H. Optional rack mounting kits are available; see

Listen website for details

Weight:

3 lbs (1.4 kg)

Transmission Range:

72MHz: 500 - 1500 ft (152 - 457 m)

216Mhz: 1000 - 3000 ft (305 - 914 m)

*Wireless Transmission System Specifications: End-to-end.

LT-800 Specifications

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-800 Troubleshooting

The LT-800 has no power.

Make sure the LA-201 power transformer is connected to a power

source and is connected to the jack marked “Power Input”. Make

sure the POWER button is pressed.

There is no audio or the audio level is too low.

Make sure that you have an audio source properly connected to

INPUT 1 and/or 2. The INPUT 1 or 2 switch must be located 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 LINE position. If it were to be in the SPEAKER 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 2 corresponding with the input level of the audio source.

Try connecting a headset to the front panel jack and adjusting the

MONITOR volume control so that you can listen to the audio source.

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 switch is in the correct

position on both the LT-800 and the receivers you are using. If your

receivers do not have SQ, make sure the SQ switch inside the top of

the LT-800 is turned off.

There is hum in the audio.

Make sure you have properly grounded the audio source to the LT-

800. Check the connections from the audio source to the LT-800. If

you can, try to use a balanced audio source - this will reduce the

chance of creating hum. Try connecting a ground from the LT-800 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.

I cannot change the broadcast channel.

The unit is locked. To unlock, press the UP and DOWN buttons

simultaneously for 3+ seconds. When the unit is locked, the decimal

by the channel indicator is illuminated.

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 1/4” plug is grounded.

There is interference.

Try different frequencies until you find a clear channel. If this does

not work, try a different frequency band (i.e. if you’re using 72MHz,

try 216MHz or vice versa). This is accomplished by returning the

equipment to Listen (no charge) and replacing it with Listen’s

alternate frequency band equipment.

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. 72MHz or 216MHz) and that they are on

the same channel. Make sure the LT-800 has an antenna connected.

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 number / letter. It’s a good idea to lock the channels

once they have been set. To lock the LT-800, press the UP and

DOWN buttons simultaneously for a few seconds.

I’m using another brand of receiver - how do I tell

which channel to use?

Refer to Listen’s Frequency Compatibility Tables (pages 39-42).

Adjust Listen’s transmitter or receiver to the same frequency as the

other major brand. Since Listen products can access 57 channels,

they will most likely transmit or receive on the same fixed channel or

channels of other major ALD brands. If you are using another brand of

receiver, make sure you have turned off SQ in the LT-800.

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 transmitter or connected to the back of the

unit (but not both!). Place the antenna at as high a location as

possible and free of obstacles. Make sure the antenna is of the

correct type and is connected properly to the unit. You might want

to use a remote antenna (made by Listen) that can be mounted on a

mast or wall. Try using different frequencies that don’t have

interference. If you’re using 216MHz, you might want to try a

directional antenna.

End users are adjusting the unit.

First, lock the channel by pressing the UP and DOWN buttons

simultaneously for 3+ seconds. Consider removing the INPUT, MIX

LEVEL and CONTOUR knobs. You can order from Listen a rack mount

kit and security cover that will limit access to the unit.

Other manufacturers’ receivers sound distorted.

The Listen transmitter is probably over-deviated. See page 10 for

instructions on how to correct this. Turn off SQ in the Listen LT-800

(see page 5).

LT-800 Troubleshooting

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-700 Portable Transmitter Quick Reference

A Listen microphone or line

level cable connects here.

MUTE / TALK switch (more

information below)

Look & Listen Display

shows level,

channel, battery status, PROGRAM

mode, whether a channel is locked, and

whether a channel is locked out from

selection (PROGRAM mode). See

close-up on page 17.

Use UP and DOWN buttons to

select a channel. Press and hold

either button for 3 seconds to lock

the channel. Press and hold a

button again to unlock.

Press PWR switch to turn

unit on or off. When in

PROGRAM mode, this

switch is used to toggle the

L/O mode for a channel.

Mic Sensitivity Switch - it arrives set at MID, which will work for

most microphones. If your mic level is too low, change the switch to

HI; if the level is too loud, switch to LO.

Battery Select Switch - place in NiMH position ONLY if you are

using Nickel Metal Hydride batteries, otherwise, leave it in the

Alkaline position.

SQ Switch: shipped in the ON position, use a screwdriver or pen to

slide to the OFF position if needed. You should turn SQ off if any of

your receivers do not have SQ.

Top of Unit

A microphone or

line level cable

connects here.

LED indicators:

Steady Red: Normal operation

Slow Flashing: Battery is low

Slow Flashing while charging: Unit is charging

Fast Flashing: Mute

MUTE / TALK switch -

this mutes the mic only

and not the line input.

LT-700 Portable Transmitter Quick Reference

Inside Access Door

Press and hold both buttons

for about 5 seconds to

enter PROGRAM mode.

The PGM icon will appear

in the display. To exit

PROGRAM, let unit sit idle

for 4+ seconds.

A Note on Charging NiMH Batteries

If you are using NiMH batteries in any

listen product, you should allow adequate

time for the charger (drop-in case or

LA-202) to complete a full charge cycle on

the batteries. This takes about 13 hours.

Mic Sensitivity

Switch

Battery Select

Switch

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Preparing the LT-700 for Use

Remove the product from the shipping

container and plastic cover.

Inspect for physical damage. See “Technical Service

Contacts (page 4) if damage has occurred.

Check to see if the door is locked.

If locked, use a pocketknife or small screwdriver to

unlock the door locks on both sides of the unit. To

unlock the door, rotate the lock 1/4 turn counterclock-

wise.

Open the front access door.

Grip the two tabs with your thumb and index finger

and pull the door downward. Do NOT place

batteries in the unit yet.

Select Battery Type.

See diagram (on step 5). You have two choices:

NiMH and Alkaline. The unit is shipped with the

switch in the Alkaline position. Use a pen or small

screwdriver to select the battery type.

Caution: if you are using any battery type other than

rechargeable Nickel Metal Hydride (NiMH) batteries,

make sure the BATTERY selection switch is in the

alkaline position.

Set SQ switch.

See Page 5 for more information on SQ. The SQ

switch is inside the battery compartment next to

the Battery Select switch. The unit is shipped with

SQ in the ON position. To turn it off, use a small

screwdriver or pen to slide the switch to the OFF

position (to the right).

WARNING: Do not place the BATTERY switch in the

NiMH position if you are not using Nickel Metal Hydride

Batteries. The NiMH position will attempt to charge the

batteries. Charging non-Nickel Metal Hydride batteries

may result in physical harm, destruction of property

and/or fire.

Set Mic Sensitivity Switch.

See the above diagram. This switch is located

inside the battery compartment, to the left of the

BATTERY selection switch. The LT-700 is shipped

with this switch in the center (Mid) position.

Listen recommends the following settings for its

microphones. If you are using a microphone from

another vendor, you may need to experiment with

different settings.

Part # Description Setting

LA-261 Lavalier Microphone Mid

LA-262 Over-the-Head Microphone Mid

LA-268 Over-the-Ear Microphone Mid

LA-270 Noise Cancelling Microphone Mid

LA-274 Handheld Microphone Hi

LA-276 Collar Microphone Hi

LT-700 Portable Transmitter

SQ Switch

Battery Select

Switch

Mic

Sensitivity

Switch

Locks

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Place Batteries in Unit.

Place two AA batteries in the compartment, making

note of the battery polarity shown in the battery

compartment, and again verifying that the BATTERY

SELECT switch is in the correct position for the

batteries you are using.

Connect the Microphone.

The microphone jack is located on top of the unit.

The LT-700 uses the microphone cable as an antenna

for transmitting.

Optional - Connect the Line Input Cable.

This cable allows you to connect a TV, CD player or

other equipment to the LT-700. To do this, you must

order the Listen LA-263 Line Input Cable (it is not

included with your unit). This cable allows you to

connect both a microphone and line input to the jack

on top of the LT-700. See the diagram below for

connection information. You can use the microphone

and the line input at the same time. Please note that

the MUTE switch mutes only the microphone; your

line source will continue transmitting when MUTE is

pressed.

LT-700 Portable Transmitter

If you prefer to make your own cable for connection of

mic and line inputs, connect as follows:

MICROPHONE

TV, CD

PLAYER

LINE INPUT CABLE

LA-263

Turn the Unit On.

If it does not turn on by pressing the power button,

check to make sure you have installed charged

batteries and that the batteries have been installed

correctly.

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

Operating the LT-700 Transmitter

Make sure the unit is on.

When you press the power button, the LED on top of

the unit will be illuminated.

Select the channel for transmitting.

Please refer to “Selecting a Channel for Transmitting”

on Page 10 for guidelines on choosing an interfer-

ence-free channel.

To select a channel, press either the channel UP or

DOWN button until the display reads the channel you

want. To lock your selection, press and hold the UP

or DOWN button for 3+ seconds. When locked, the

small padlock will be visible on the display. Press and

hold the button again to unlock.

At 72MHz:

The LT-700 operates on 17 wide band channels and

40 narrow band channels. Channels represented by

letters in the display (i.e. A) are wide band channels;

channels represented by numbers are narrow band

channels.

At 216MHz:

The LT-700 operates on 19 wide band channels and

38 narrow band channels. Channels beginning with a

“2” are wide band channels and channels beginning

with a “1” or “3” are narrow band channels.

Listen recommends using wide band channels

whenever possible, as they are not as noisy as

narrow band channels.

Refer to the Frequency Compatibility tables (pages

39-42) for specific frequencies and compatibility with

other manufacturers. Also refer to Appendix A,

“Which Channel(s) Should I Use?” on page 43.

Close the Access Door.

Lock it if desired by turning the locks on the side of

the unit to the vertical position.

Make sure the red MUTE / TALK switch on

top of the unit is in the correct position.

This switch is a handy way to “turn off” the

microphone when needed; just slide it to the MUTE

position. Return it to the TALK position to resume

your audio. When MUTE is active, the microphone is

muted and the LED on top of the unit will flash

rapidly. If you are using line level audio, it will not be

muted.

LT-700 Portable Transmitter

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-700 Portable Transmitter

LT-700 Look & Listen

Display Descriptions

When illuminated, the microphone is

active. If this display does not appear,

the microphone is muted.

Listen - We Hear You!

Indicates the currently

tuned channel

Battery level indicator.

The indicator flashes,

along with the red LED on

top of the unit, to alert you

when the battery is low

and needs to be charged or

changed.

When in the PROGRAM mode, L/O

indicates whether a particular

channel is locked out.

When the padlock icon appears, the

channel is locked. Press and hold

either the UP and DOWN button for

3+ seconds to lock or unlock.

Indicates the unit is in PROGRAM

mode (see next page). To enter

PROGRAM mode, press and hold

the UP and DOWN keys until the

PGM icon appears in the display.

To exit PROGRAM mode, don’t

press a key for about 4 seconds; it

will exit automatically.

Battery Indicator:

All three segments showing: the batteries

are at greater than 50% capacity.

Two segments showing: you have less than

half of your battery life left.

One segment showing: Your batteries are

low. When this segment begins flashing

along with the LED on top of the unit, you

should immediately change your batteries or

recharge them (if using NiMH batteries).

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-700 Programming

The LT-700 can be programmed to transmit on a

limited number of channels. For applications where

users are required to select a channel (such as

classrooms or language interpretation), and you don’t

want them to have to scroll through all of the

available channels, this feature is ideal. You can set

up the LT-700 so that only the channels they need to

use are available for selection with the UP and

DOWN buttons.

Enter PROGRAM Mode.

Press the UP and DOWN keys simultaneously until

the PGM symbol is displayed (see the Look &

Listen

display descriptions on page 17).

Scroll Through Channels to Lock or Unlock.

Use the UP and DOWN channel select keys to scroll

through all available channels. If the L/O symbol

appears with a particular channel’s indicator, this

means that particular channel will not be available for

selection by the user. To toggle a channel between

locked out and available, press the POWER button.

To exit PROGRAM mode:

Allow the unit to sit idle (don’t press any buttons) for

about 4 seconds. The LT-700 will exit the PROGRAM

mode and the PGM icon will disappear.

Charging Batteries

The LT-700 and all Listen receivers are unique

because they have SmartCharge

chargers built in.

When any of these units are connected to an LA-202

wall transformer or dropped into a Listen charging

case, NiMH batteries will be charged.

To charge the batteries using the LA-202 wall

transformer, plug the transformer into the jack

marked “PWR/CHG” on the side of the unit. The unit

can be operated while the batteries are charging.

LT-700 - Programming; Charging Batteries

To charge the batteries using a drop-in charger,

simply place the unit into a slot in the charger and

connect the charger to power. Make sure the unit is

fully seated in its slot.

Connect LA-202

here and plug it

into an AC wall

outlet.

One of several charging cases available from Listen.

Check the Listen website for more details.

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

SmartCharge

uses a pulse charging, which greatly

extends the life of Nickel Metal Hydride (NiMH)

batteries. The entire charging process takes about

13 hours. Listen recommends that you allow the

charger to complete its full cycle every time for

maximum battery life.

IMPORTANT: DO NOT ATTEMPT TO CHARGE ANY

TYPE OF BATTERY OTHER THAN NiMH (NICKEL

METAL HYDRIDE) with your Listen equipment.

Alkaline batteries may explode when connected to a

charger. Other risks of charging non-NiMH batteries

include destruction of property or fire.

IMPORTANT: In order to charge NiMH batteries, the

BATTERY SELECT switch in your Listen product must

be set to the NiMH setting. Use a pen or small

screwdriver to move the switch (located in the

battery compartment) to the proper position.

During the charge cycle, the red LED on top of the

Listen product will flash slowly. When charging is

completed, the LED will turn off. It is not necessary

to unplug the charger; however, if you unplug the unit

from the charger and then plug it back in, it will begin

the discharge / charge cycle over again.

When not using the LT-700, it is recommended to

leave the unit on the charger. The charger provides

a “maintenance” charge that keeps the battery at

100%. If the unit is not on the charger, the battery

will lose up to 20% of its charge per month.

Note: NiMH batteries may be purchased from your

Listen dealer (ask for part number LA-362).

LT-700 Portable Transmitter -- Charging Batteries

Operating the LT-700 With a Wall

Transformer

Charging Batteries Cont.

The LT-700 will operate normally when connected to

a wall transformer. Use Listen part number LA-202,

available from any Listen dealer. Connect the wall

transformer to the jack on the side of the LT-700

marked “PWR/CHG” and plug the wall transformer

into a grounded AC outlet.

You do not need to have batteries installed in the LT-

700 to operate it with a wall transformer.

LT-700 - Charging Batteries; Wall Transformer Use

LISTEN TECHNOLOGIES CORPORATION +1.801.233.8992 1.800.330.0891 Fax: +1.801.233.8995

Internet: www.ListenTech.com All specifications subject to change without notice.

LT-700 Troubleshooting

LT-700 Portable Transmitter Troubleshooting

The LT-700 has no power.

Make sure the unit has fully charged batteries, or has a

Listen LA-202 wall transformer connected to it. Press the

ON button. If this does not work, try a different set of

batteries. Make sure the batteries are installed correctly.

There is no audio.

Make sure the MUTE switch is in the TALK position. Make

sure you have the microphone plugged all the way in at

the top of the unit. Make sure you are using a Listen

approved microphone (see list on Page 14). If you are

using the line input, make sure you have connected a line

level, unbalanced input at the “ring” of the connector.

The audio is distorted.

Make sure you are using an approved Listen microphone.

Try using a different mic sensitivity switch setting (the

switch is located inside the battery compartment of the

unit). If you are using a line level input, try turning down

the level of the input. If you are using any equipment that

does not have SQ capability, turn off SQ in the LT-700.

There is hum in the audio.

The microphone may be too close to a transformer. Try

moving around and see if the hum goes away.

The microphone is low in level.

The microphone must be in close proximity to the person

who is speaking. If this does not work, try using a head-

worn microphone. The mic sensitivity switch may be on

the wrong setting. Try a different setting (the switch is

located inside the battery compartment).

The audio doesn’t have much fidelity.

If your receivers all have SQ capability, activate SQ in all

units by moving their switches to the ON position. In the

LT-700 and all SQ-equipped receivers, the SQ switch is

located inside the battery compartment.

There is too much noise.

This is most likely because the microphone is not close

enough to the talker’s mouth, and it is picking up

background noise. Try positioning the microphone closer

or try using a microphone that is directional (such as a

head-worn mic). If you are using a narrow band channel,

try switching to a wide band channel. Try another setting

on the mic sensitivity switch (located inside the battery

compartment).

There is interference.

Try different frequencies until you find a clear channel. If

this does not work, try a different frequency band (i.e. if

you are using 72MHz equipment, exchange it for 216MHz

equipment). This is done by returning the equipment to

Listen (no charge) and swapping it for the alternate

frequency band equipment.

I cannot pick up the signal on the receiver.

Make sure the transmitter and the receiver are on the

same frequency band (72MHz or 216MHz) and channel.

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 number / letter.

I’m using another brand of receiver - how do I tell

which channel to use?

Refer to Listen’s Frequency Compatibility Tables (on pages

39-42).

There is not sufficient range.

The LT-700 is a portable transmitter that uses the

microphone cable as an antenna and the range will vary

depending on the location of the receivers compared to

the transmitter. You can only expect about 100 feet of

average effective working range.

It’s confusing for users to have 57 channels when

switching between channels.

Use the PROGRAM function to lock out unwanted

channels. This way, users will only need to scroll among a

few channels.

My batteries are not charging.

Make sure you are using NiMH batteries and that the

BATTERY SELECT switch (inside the battery compartment)

is set to the NiMH position. Make sure the batteries are

installed correctly. Make sure you are using the right kind

of wall transformer (a Listen LA-202) or charging case.

Make sure the charging case is connected to power and

the unit is securely pushed into its slot in the case.

I cannot change the channel.

It is probably locked (check for the padlock icon). To

unlock, press and hold the UP or DOWN button for 3

seconds.

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Listen lt-800 User manual

Brand: Listen

Model: lt-800

Category: Wall transmitters

Type: User manual

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