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Overview

Offering outstanding audio clarity, digital signal strength, and 32 selectable channels, the LT-800 is a perfect RF transmitter choice for a wide range of applications. Connected to your main audio system, the LT-800 broadcasts reliable audio to both belt pack receivers and stationary receivers, ideal for providing listeners with the best possible assistive listening experience.

*Note: The LT-800-150 is approved for use in Australia

Includes

One (1) LT-800-150 Stationary RF Transmitter (150 MHz)
One (1) User manual
One (1) LA-207 Power Supply for LT-800
One (1) Line Cord

Highlights

  • Look & Listen (TM) LCD display for quick channel, programming, and channel lock status information
  • Balanced and unbalanced audio inputs allow for use with any audio source
  • Built-in auto processor optimizes audio (voice or music) prior to transmission
  • 32 available, selectable channels
  • VU level meter and test tone for simple installation and set up
  • 30-day, no-obligation demonstration available for your venue or business
  • Backed by Listen Technologies’ limited lifetime warranty and hassle-free support
Configurations & Architectural Specs

Configurations

LT-800-150-04 Stationary RF Transmitter (150 MHz) (Australia)

Architectural Specs

The stationary RF transmitter shall be capable of broadcasting on 32 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 15 kHz (‘±3 dB). 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-800-150 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
SpecificationLT-800-150-04

Audio

Frequency Response50 Hz - 15 kHz (±3 dB)
Signal-to-Noise RatioSQ enabled 80 dB, SQ disabled 60 dB
Audio Input 1Rear panel, one (1) Female XLR and 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 ohms (line/mic), phantom power +12 VDC
Audio Input 2Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohms
Audio ProcessingCompression can be turned on/off. Slope internally adjustable from 1:1 to 4:1. Default 2:1
ContourCuts and boosts frequencies above 5 kHz
Distortion< 2% total harmonic distortion (THD) at 80% deviation
Audio OutputInput 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 ohms
Headphone OutputFront panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohms

Controls

User ControlsFront 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 AdjustmentsCompression ratio for audio processor
ProgrammingProcess on/off, SQ on/off, channel lock

Indicators

LCDChannel Designation, lock status, RF power level, programming (front panel)
Audio Input Status LEDsIndicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
ProcessingIndicated by a green LED when on (front panel)
Test ToneRed LED illuminates when test tone is enabled
RF PowerIndicated on the LCD (low, mid, high)

RF

Frequency Range150.8000 MHz - 152.3500 MHz
Number of Channels6 wideband, 26 narrowband
Frequency Accuracy± .005% stability 32 to 122º (0 to 50ºC)
Antenna TypeVarious
Transmitter Stability50 PPM
Transmission RangeUp to 762 m (2500 ft.)
Antenna ConnectorBNC, 50 Ohms (Use RG-58 < 75 ft or RG-8 > 75 ft)
Output Power< 100 mW EIRP
Number of Simultaneous Transmitters6

Power

Power SupplyIn line power supply (Listen part number LA-207)
Power Supply Input100-240 VAC, 50-60 Hz, 0.4 A
Power Supply Output12 VDC, 1.3 A, 15.6 W
Power Supply Connector0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
ComplianceUL, CE, GS, TÜV, RoHS

Physical

Width8.50 in. (21.5 cm)
Height1.75 in. (4.5 cm)
Depth9.13 in. (23 cm)
Unit Weight with Power Supply3.5 lbs. (1.6 kg)
Shipping Weight6 lbs. (2.7 kg)
Rack MountingOne (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)
Weight2.6 lbs. (1.2 kg)
ClipsDark Grey with white silk screening

Environmental

Temperature - Operation-10 ºC (14 ºF) to +40 ºC (104 ºF)
Temperature - Storage-20 ºC (-4 ºF) to +50 ºC (122 ºF)
Relative Humidity0 to 95% relative humidity, non condensing

Compliance

SafetyCE, ETSI, RoHS
Requirements
Used With
Accessories
FAQ
QWhat is the range of the LT-800-150 transmitter?
AUp to 762 m (2,500 ft.)
QDoes the LT-800-150 include the rack mount?
ANo, but an LA-326 Universal Rack Mounting Kit is available for purchase.
QIs there a limit to the number of transmitters I can use in one room?
AYes. The 72 MHz LT-800-072 has a maximum of (8) eight.
QDo I need a transmitter for each audio source?
AEach audio source requires a transmitter.
QHow many receivers can I have on a system?
AAs 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".

In short, your product help us provide effective ministry! We have been using the Listen system and I have had nothing but compliments. Sound quality is extremely good throughout the sanctuary – and indeed, throughout the church.

Bob Gann
Sound System Coordinator, St. John’s Lutheran Church
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