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LT-800-072

Stationary RF Transmitter (72 MHz)

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$724.00

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This product is available through authorized resellers.

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Overview
Download Product Data Sheet

Thanks to its outstanding audio quality, the Listen LT-800 Stationary Transmitter can be used in a variety of applications. The LT-800 connects to your main audio system, to broadcast a high quality audio signal to belt pack receivers or stationary receivers. The end result – your audience can hear and understand the presentation better because of improved speaker placement or because they have their own belt pack and headset. The signature Look & Listen™ LCD shows channel, lock, programming and RF power.

Includes

One (1) LT-800 Stationary RF Transmitter (72 MHz)
One (1) LA-207 Power Supply for LT-800
One (1) Line Cord
One (1) Quick reference card

Highlights

  • Superior audio quality – 80 dB signal-to-noise ratio (SNR), setting the industry’s sound quality standard
  • 57 selectable channels
  • 100% Digital – Listen transmitters are digitally-tuned so the transmission won’t drift
  • Up to six (6) simultaneous channels on 72 MHz with multiple transmitters
  • Limited Lifetime Warranty
  • Look & Listen™ LCD shows channel, channel lock, and programming information
  • Balanced/Unbalanced Inputs – interface with any audio source on the market
  • Designed for installation – rack mountable with optional remote antennas make installation easy and service reliable
  • Auto Processor – to condition the audio for voice/music prior to transmission
  • VU level meter and test tone – simply makes the installation easier to set-up
  • 30-day no obligation demonstrations available
  • Many accessory options make Listen products ideal for a wide range of applications
Configurations & Architectural Specs

Configurations

LT-800-072-01 Stationary RF Transmitter (72 MHz) (North America)

Architectural Specs

The stationary RF transmitter shall be capable of broadcasting on 57 channels. The transmitter shall have an SNR of 80 dB or greater. The output power shall be adjustable to quarter, half or full. Channel tuning shall be capable of being locked. The device shall have an audio frequency response of 50 Hz to 15k Hz, ±3 dB at 72 MHz. It shall have two (2) mixing audio inputs and a mixed signal output. The device shall have the following audio controls: input level, mix level and an adjustable low pass filter (contour). The device shall have an audio processor that is capable of automatic gain control and limiting. The Listen LT-800-072 is specified.

1. POWER: Easy access from the front to turn unit On/Off.
2. INPUT 1 & 2 AND INPUT LEVEL INDICATORS: Adjust audio levels of Input 1 and 2. Dual VU meters shows audio Input 1 and 2 levels.
3. MIX LEVEL & MIX TRANSMIT LEVELS: Mix Level control sets level of mixed audio. VU meter shows the output level of your mixed audio.
4. CONTOUR: Contour equalization Cuts/Boosts frequencies above 5 kHz.
5. PROCESS LED: Processing (automatic gain control and compression) can be turned on and off from the front panel.
6. SQ™ LED: (Super Quiet Companding Technology) can be turned on and off from the front panel.
7. LCD DISPLAY: Shows channel selected, channel lockout, programming, and RF power.
8. RF ANTENNA OUTPUT: Top mount antenna jack for top mounted telescoping antennas.
9. MONITOR LEVEL: Earphone jack and volume control to check audio integrity of transmission source.
10. CHANNEL SELECT: UP/DOWN channel selection of 57 channels. User can easily change between Basic and Expanded modes.
11. TEST TONE: The test tone level is adjustable, which adds flexibility when setting up and testing system.
12. RF ANTENNA OUTPUT: Top mount, rear mount, and remote antenna options.
13. RF POWER LEVEL: Multiple transmitter power settings (full, ½ and ¼) with indication on LCD display.
14. POWER INPUT: In-line power supply (included) attaches.
15. AUDIO OUTPUTS: Two (2) phono connectors for a mixed output of Inputs 1 and 2.
16. AUDIO INPUT 2: Two (2) unbalanced phono audio inputs. Select either +10 dBu or -10 dBu.
17. INPUT 2 LEVEL SWITCH: Set switch to match the level of Input 2 source.
18. INPUT 1 LEVEL SWITCH: Set switch for line or mic level. Phantom power available in Mic-PH power position.
19. AUDIO INPUT 1: Balanced XLR / ¼ inch audio input. Select either mic, line, or mic phantom power level for input. Electret (Condenser) microphones can be used with Input 1, mic, and phantom power.

Product Specifications
Specification LT-800-072

Audio
Frequency Response 50 Hz - 15 kHz (±3 dB)
Signal-to-Noise Ratio SQ enabled 80 dB, SQ disabled 60 dB
Audio Input 1 Rear panel, one (1) Female XLR or 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 / +21 dBu (line/mic) maximum input level, impedance 20k / 1k ohm (line/mic), phantom power +12 VDC
Audio Input 2 Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohm
Audio Processing Compression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1
Contour Cuts and boosts frequencies above 5 kHz
Distortion < 2% total harmonic distortion (THD) at 80% deviation
Audio Output Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 ohm
Headphone Output Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm

Controls
User Controls Front Panel: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume controlRear Panel: Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10 / +10 dBu), RF power level (low, mid, high)
Internal Adjustments Compression ratio for audio processor
Programming SQ on/off, process on/off, channel lock

Indicators
LCD Channel designation, lock status, RF power level, programming (front panel)
Audio Input Status LEDs Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
Processing Indicated by a green LED when on (front panel)
Test Tone Red LED illuminates when test tone is enabled.
RF Power Indicated on the LCD (low, mid, high)

RF
Frequency Range 72.025 - 75.950 MHz
Number of Channels 17 wide band, 40 narrow band
Frequency Accuracy ± .005% stability +32º to +122 ºF (0º to +50 ºC)
Antenna Type Various antennas available
Transmitter Stability 50 PPM
Transmission Range Up to 1,500 ft. (457 m)
Antenna Connector BNC
Output Power 80,000 uV at 3 m
Number of Simultaneous Transmitters 6

Power
Power Supply In line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
Power Supply Input 100-240 VAC, 50-60 Hz, 0.4 A
Power Supply Output 12 VDC, 1.3 A, 15.6 W
Power Supply Connector 0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
Compliance UL, CE, GS, TÜV, RoHS

Physical
Width 8.50 in. (21.5 cm)
Height 1.75 in. (4.5 cm)
Depth 9.13 in. (23 cm)
Color Dark Grey with white silk screening
Unit Weight with Power Supply 3.5 lbs. (1.6 kg)
Shipping Weight 6.0 lbs. (2.7 kg)
Rack Mounting 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)
Weight 2.6 lbs. (1.2 kg)

Environmental
Temperature - Operation -10 ºC (14 ºF) to +40 ºC (104 ºF)
Temperature - Storage -20 ºC (-4 ºF) to +50 ºC (122 ºF)
Relative Humidity 0 to 95% relative humidity, non condensing

Compliance
Safety RoHS
RF FCC Part 15, Part 90, Industry Canada
Requirements

Helical Top Mounted Antenna (72 MHz)

 The easy-to-install LA-101 is a top-mounted, helical antenna for use with the LT-800-072 transmitter. The antenna mounts through an opening on top of the LT-800-072 for low-clearance installations. LA-101

Telescoping Top Mounted Antenna (72 MHz)

 The LA-106 telescoping antenna is designed for use with the LT-800-072 Stationary RF Transmitter (72 MHz) and offers improved reach and broadcast coverage over the LA-101 Helical Top Mounted Antenna. LA-106

Coaxial Dipole Remote Antenna (72 MHz)

 The LA-116 flexible dipole antenna is designed for installation on a wall, in a drop ceiling, or in other locations. The 80 in. (203 cm) length provides plenty of cable for various applications. LA-116

Universal Antenna Kit (72 and 216 MHz)

 The LA-122 Universal Antenna Kit includes monopole and dipole options for both 72 MHz and 216 MHz systems. The mounting hardware allows for flexible installation on walls, electrical boxes, and more. LA-122

90 Degree Helical Antenna (72 MHz)

 The LA-123 antenna mounts to the rear of the LT-800 transmitter, LR-100 receiver/amplifier, or LR-600 receiver/speaker, or it can be used to create a custom remote antenna in other applications (72 MH... LA-123

Antenna Kit for Rack Mount (72 MHz)

 The LA-125 antenna kit is used with the LA-326 to convert the rack-mount kit to an antenna rack mount. A 90-degree Helical antenna is included, and the kit can be used to build your own antenna. LA-125
Used With

Portable Digital RF Receiver (72 MHz)

 Standard RF receiver with 17 channels, SEEK channel selection button inside the unit, and high quality audio. LR-300-072

Antenna Kit for Rack Mount (72 MHz)

 The LA-125 antenna kit is used with the LA-326 to convert the rack-mount kit to an antenna rack mount. A 90-degree Helical antenna is included, and the kit can be used to build your own antenna. LA-125

Remote Antenna Kit 25 ft. (7.6 m)

 Allows the user to remotely place the antenna for better coverage. It comes with 25' (7.6 m) of 50 ohm coaxial cable. LA-130

RG-59 75 Ohm Coaxial Cable (Per ft. / .3 m)

 This is required to connect the DIS transmitter to its radiators. Cable delay is 1.54 ns/ft.  LA-86

Universal Rack Mounting Kit

 Allows single or dual-unit mounting of the LT-800 Stationary Transmitter, LT-803 3-Channel Stationary Transmitter, LT-82 Stationary IR Transmitter, and LR-100 Stationary Receiver/Amplifier. LA-326

Stationary RF Receiver/Power Amplifier (72 MHz)

 Stationary RF receiver with a built-in power amplifier. Features 80 dB signal-to-noise ratio, 57 channels, multiple input options, and LCD Display. LR-100-072

Portable Display RF Receiver (72 MHz)

 Standard RF receiver with the choice of 57 channels, superior audio quality, digital display, and channel select buttons on the inside of unit. LR-400-072

Portable Programmable Display RF Receiver (72 MHz)

 Standard RF receiver with programmable channel name, channel select buttons on the outside of unit, choice of 57 channels, digital display, and superior audio quality. LR-500-072

Conference Microphone

 This microphone is omni-directional microphone that sits on a table top. LA-277

Assistive Listening Notification Signage Kit

 An important part of the American's with Disabilities Act compliance policy is signage to identify the availability of auditory assistance equipment. Listen provides a simple kit to meet these needs. ... LA-304

Intelligent DSP RF Receiver (72 MHz)

 iDSP Receiver with 57 channels for 72 MHz. Features single channel listening with 20 dB less noise and hiss, OLED display, customizable channel name, and advanced battery. LR-4200-072

Advanced Intelligent DSP RF Receiver Package 1 (72 MHz)

 An LR-5200-072 receiver with integrated neck loop/lanyard, and universal ear speaker. Perfect for personal use. LR-5200-072-P1

Advanced Intelligent DSP RF Receiver (72 MHz)

 iDSP Receiver with 57 channels for 72 MHz. Features multi-channel listening with 20 dB less noise and hiss, OLED display, customizable channel name, Listen Function button, and advanced battery. LR-5200-072

Intelligent DSP RF Receiver Package 1 (72 MHz)

 An LR-4200-072 receiver with integrated neck loop/lanyard, and universal ear speaker. Perfect for personal use. LR-4200-072-P1

Intelligent DSP RF Receiver 6-Pack (72 MHz)

 Ideal package to upgrade a previously existing system. Includes six LR-4200-072 receivers, six integrated neck loop/lanyards, six universal ear speakers, and a 12-unit charging tray. LP-40-072

Intelligent DSP RF Receiver 12-Pack (72 MHz)

 Ideal package to upgrade receivers. Includes 12 LR-4200-072 receivers, 12 integrated neck loop/lanyards, 12 universal ear speakers, and a 12-unit charging tray. LP-41-072

Advanced Intelligent DSP RF Receiver 6-Pack (72 MHz)

 Ideal package to upgrade a previously existing system. Includes six LR-5200-072 receivers, six integrated neck loop/lanyards, six universal ear speakers, and a 12-unit charging tray. LP-50-072

Advanced Intelligent DSP RF Receiver 12-Pack (72 MHz)

 Ideal package to upgrade receivers. Includes 12 LR-5200-072 receivers, 12 integrated neck loop/lanyards, 12 universal ear speakers, and a 12-unit charging tray. LP-51-072

Multi-Lingual Assistive Listening Notification Sign

 The LA-303 multi-lingual sign can be wall mounted or placed on a table using the included double-wing easel. The sign provides notification in English, French and Spanish. LA-303

LDS Meeting House Receiver

 The LDS Meeting House Receiver incorporates multiple channel selectivity into its advanced, innovative DSP technology producing an exceptional listening experience. LDS-5200-072

LDS Meeting House Receiver

 The new Listen Intelligent DSP receiver incorporates advanced, innovative DSP technology producing an exceptional listening experience. LDS-4200-072

LDS Receiver Package

 This package makes it easy to order a receiver and charger, allowing an exceptional listening experience in your meeting house chapel. LDS-4200-072-P0

LDS Receiver Package 1

 Everything needed for an exceptional listening experience; new Intelligent DSP RF receiver, integrated neck loop/lanyard, and ear speaker. LDS-4200-072-P1
Accessories

RG-58 50 Ohm Coaxial Cable (Per ft.)

 This is used when more distance is needed for the antennas to have better coverage. LA-112

RG-8 50 Ohm Low-Loss Coaxial Cable (Per ft.)

 This is measured and cut per foot. It is best used when more distance is needed for the antennas to have better coverage. LA-113

RG-58 BNC Connector

 This is a BNC connector for the LA-112 RG-58 Coaxial Cable (Crimp style). LA-127

RG-8 BNC Connector

 This is a BNC connector for the LA-113 RG-8 Coaxial Cable (screw & solder style). LA-128

RG-58 50 Ohm Preassembled Coaxial Cable (Per ft./.3 m)

 The LA-391 cable comes with both BNC connectors attached to the desired length of RG-58 cable for your RF/IR predesigned system. 10 ft. (3 m) minimum order. LA-391

RG-8 50 Ohm Preassembled Coaxial Cable (Per ft./.3 m)

 The LA-390 preassembled cable offers the correct amount of cable for your RF/IR installation. Both BNC connectors come attached to the desired length of RG-8 cable. 50 ft. (15.2 m) minimum order. LA-390

2-Way RF Antenna Combiner

 The combiner is used in applications where up to two (2) different antenna sources are required and only one (1) antenna output is available or desired. LA-80

4-Way RF Antenna Combiner

 The combiner is used in applications where up to four (4) different antenna sources are required and only one (1) antenna output is available or desired. LA-81

6-Way RF Antenna Combiner

 The combiner is used in applications where up to six (6) different antenna sources are required and only one (1) antenna output is available or desired. LA-82

15 VAC Replacement Power Supply for LT-800/LR-100

 A replacement for a missing or defective power supply used with the LR-100 receiver/amplifier. LA-201

12 VDC Replacement Power Supply for LT-800

 Provides power for the LT-800 Stationary Transmitter with four user-selectable line cord configurations. LA-207

BNC Coupler

 Female to female BNC coupler is designed to connect two (2) coaxial cables together. LA-115
Support Info
FAQ
Q Does the LT-800 include the rack mount?
A No, but an LA-326 Universal Rack Mounting Kit is available for purchase.
Q Do I need a transmitter for each audio source?
A Yes.
Q What is the range of the LT-800-072 transmitter?
A Line of site up to 1,500 ft. (457 m) for 72 MHz.
Q Is there a limit to the number of transmitters I can use in one room?
A Yes. The 72 MHz LT-800-072 has a maximum of (6) six.
Q How many receivers can I have on a system?
A As many as you want. The transmitter simply transmits a signal and you can have as many receivers pick that signal up as necessary. It’s like a radio station transmitting and the receivers are the radios tuning into the “channel.”
Q What channels should I be transmitting on?
A It is recommended that wideband channels are used for best audio quality. If transmitting multiple simultaneous channels, narrowband frequencies may be required.
Q How many transmitters can I have operating simultaneously?
A 72 MHz: 6 simultaneous transmissions.
Q The signal being transmitted is inconsistent, my receiver cuts in and out.
A The receiver may be out of range of the transmitter.
Q What type of microphones can I use with this transmitter?
A Dynamic microphones can be used when the Input 1 level select switch is in the "MIC" position.Condenser microphones can be used when the Input 1 level select switch is in the "MIC + Phantom Power" position.
Q What is the range of this transmitter?
A Depends on the following:• The frequency of the transmitter.• The transmitter's location.• The antenna being used on the transmitter and receiver.• The location of the remote antenna (if applicable). In general, the higher the antenna the more range.• The length of coaxial cable ran to the antenna from the transmitter (if applicable). Every foot of cable creates a power loss.• The RF power setting on the transmitter.• The objects between the transmitter and receiver. All material, especially metal, will weaken the signal strength.• When using 72 MHz, a direct line of sight distance of 1500 feet from the transmitter can be achieved.
Q I can't change the channel on my transmitter, help?
A The unit is locked on a channel. To unlock, hold the channel select "Up" for 3 seconds. The padlock icon will extinguish from the LCD display.
Q I can't access the narrowband channels on my transmitter, help?
A The transmitter is in "Basic mode" and all narrowband channels are locked out. To enter "Expanded mode" and transmit on a narrowband channel, hold the channel select "Down" button while turning on the unit.
Q What does the "contour" knob do?
A The contour knob boosts or cuts frequencies above 5kHz. It is recommended that this knob be turned counterclockwise for v
Q What does the "process" feature do? When should I use it?
A
Q Where should I have the input level switches positioned on the back of my transmitter?
A
Q My transmitter seems to have lost power/range.
A
Q Can this transmitter be powered with a DC voltage?
A
Q Can I use this transmitter with other manufacturer's receivers?
A

We've been impressed by the Listen system's ease of use (and installation), as well as its flexibility. The difference between your system and what we had been using is amazing. Patrons are happy and thus, so are we.

James D. Anderson
Director of Audio, McCallum Theater
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