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  • Stationary RF Transmitter (150 MHz)

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

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Highlights

  • Superior Audio Quality – 80 dB signal-to-noise ratio, setting the industry’s sound quality standard.
  • With a choice between 32 channels, Listen products are ideal for a wide range of applications.
  • 100 % Digital – Listen receivers are digitally-tuned so transmission won’t drift; assurance that when a channel is selected, it stays on that channel.
  • Up to six (6) simultaneous transmitted channels.
  • Look & Listen™ LCD shows channel, channel lock, and programming information.
  • Balanced/Unbalanced Inputs – user can interface with any audio source on the market.
  • Designed for installation – rack mountable with optional remote antennas make installation easy and service reliable.
  • Limited Lifetime Warranty .
  • 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.

Overview

Thanks to its outstanding audio quality, the Listen LT-800-150 Stationary RF Transmitter can be used in a variety of applications. The LT-800-150 is excellent for assistive listening, language interpretation, or other applications where running cable may not be an option. This transmitter is a great choice for interfacing to an existing sound system and broadcasting the desired sound throughout a venue. The LT-800-150 offers versatility with many different types input connections; line or mic level, balanced, unbalanced. It can be rack mounted with our optional universal rack mount kit or can be placed on a shelf. The LT-800-150 offers 32 frequencies for easy set up for a clear interference free channel. The end result – the audience can hear and understand the presentation.

Note: for use in Australia

Includes

LT-800-150 Stationary RF Transmitter (150 MHz)
User Manual
LA-207 Power Supply for LT-800
Line Cord (-04*)

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.

Line Drawing

 Stationary FM Transmitter (150 MHz)
  1. POWER on/off on front of unit for easy access.
2.       Multiple audio inputs, with input level control and dual VU meters.
3.       Mix level control sets level of mixed audio. VU meter shows the output level of your mixed audio.
4.       Contour equalization cuts/boosts frequencies above 5 kHz.
5.       Processing (automatic gain control and compression) can be turned on and off from the front panel.
6.       SQ (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.       Top mount antenna jack for top mounted telescoping antennas.
9.       Earphone jack and volume control to check audio integrity of transmission source.
10.    UP/DOWN channel selection of 57 channels. User can easily change between Basic and Expanded modes.
11.    The test tone level is adjustable, which adds flexibility when setting up and testing your system.
12.     Rear mount and remote antenna BNC connector.
13.     Multiple transmitter power settings (full, ½ and ¼) with indication on LCD display.
14.    In-line power supply (included) attaches here.
15.    Two (2) phono connectors for a mixed output of Inputs 1 and 2.
16.    Two (2) unbalanced phono audio inputs. Select either +10 dBu or -10 dBu.
17.    Balanced XLR / ¼ inch audio input. Select either mic, line or mic phantom power level for input. Electret (Condenser) microphones can now be used with Input 1 phantom power.
NOTE: For more detailed Line Drawing see LT-800 Datasheet under "Support Info" tab.

Specifications

 SpecificationsLT-800-150
AudioRF Frequency Range150.8000 MHz - 152.3500 MHz     
Number of Channels6 wideband, 26 narrowband
Number of Simultaneous Transmitters6
Frequency Accuracy± .005% stability 32 to 122º (0 to 50ºC)
Transmitter Stability50 PPM
Transmission RangeUp to 762 m (2500 ft.)
Output Power100 mW
AntennaVarious
Antenna ConnectorBNC
ComplianceCE, ETSI, RoHS
System Frequency Response50 Hz - 15 kHz (±3 dB)
System Signal to Noise RatioSQ enabled 80 dB, SQ disabled 60 dB
System Distortion<2% total harmonic distortion (THD) at 80% deviation
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 Processing (Process)Compression can be turned on/off. Slope internally adjustable from 1:1 to 4:1. Default 2:1
ContourCuts and boosts frequencies above 5 kHz
Combined Audio Output (Mix)Input 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 Output (Monitor)Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohms
 
Controls & IndicatorsFront PanelPower, Test Tone on/off, Channel up/down, Input Levels, Mix Level, Contour, Monitor volume control
Rear PanelInput 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
Input1, Input 2, Mix Level VUIndicates 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)
RF PowerIndicated on the LCD (low, mid, high)
LCD DisplayChannel Designation, lock status, RF power level, programming (front panel)
Test ToneRed LED illuminates when test tone is enabled.
   
PowerPower SupplyIn line power supply (Listen part number LA-207)
Power Supply InputInput: 100-240 VAC, 50-60 Hz, 0.4 A
Power Supply OutputOutput: 12 VDC, 1.3 A, 15.6 W
Power Supply ConnectorOutput Connector: 0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
Power Supply ComplianceUL, CE, GS, TÜV, RoHS
   
PhysicalDimensions (H x W x D)1.75 x 8.50 x 9.13 in (4.5 x 21.5 x 23 cm)
ColorDark Grey with white silk screening
Unit Weight2.6 lbs. (1.2 kg)
Unit Weight with LA-207-03 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)
Compliance 
   
EnvironmentalTemperature - Operation -10 ºC (14 ºF) to +40 ºC (104 ºF)
Temperature - Storage -20 ºC (-4 ºF) to +50 ºC (122 ºF)
Humidity0 to 95% relative humidity, non condensing
   
Specifications are subject to change without notification

None

Used With

Accessories

Support Documents

    • FAQ

    Does the LT-800-150 include the rack mount?
    No, but an LA-326 Universal Rack Mounting Kit is available for purchase.
     
    Do I need a transmitter for each audio source?
    Yes.
     
    What is the range of the LT-800-150 transmitter?
    Up to 762 m (2,500 ft.)
     
    Is there a limit to the number of transmitters I can use in one room?
    Yes. There can be up six (6) simultaneous channels with 150 MHz.
     
    How many receivers can I have on a system?
    As many as wanted. 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.”

    Troubleshooting Guide

    What is the range of this transmitter?

    • 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.
    • When using 216 MHz, a direct line of sight distance of 3000 feet from the transmitter can be achieved.

    What channels should I be transmitting on?

    • It is recommended that wideband channels are used for best audio quality. If transmitting multiple simultaneous channels, narrowband frequencies may be required.

    How many transmitters can I have operating simultaneously?

    • 72 MHz: 6 simultaneous transmissions
    • 216 MHz: 3 simultaneous transmissions

    The signal being transmitted is inconsistent, my receiver cuts in and out.

    • The receiver may be out of range of the transmitter.

    What type of microphones can I use with this transmitter?

    • 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.

    I can't change the channel on my transmitter.

    • 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.

    I can't access the narrowband channels on my transmitter.

    • 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.

    What does the "contour" knob do?

    • The contour knob boosts or cuts frequencies above 5kHz. It is recommended that this knob be turned counterclockwise for voice and clockwise for music.

    What does the "process" feature do? When should I use it?

    • The process feature is a type of Automatic Gain Control. If your input signals to the transmitter are inconsistent in level and you wish to have gain control, then this should be turned on.

    Where should I have the input level switches positioned on the back of my transmitter?

    • Depends on the level of audio being input.
    • When using Input 1:
      • MIC position: For a microphone or MIC level input of -55dbu.
      • MIC Phantom Power: For a condenser microphone that needs a 12VDC phantom power supply supply at a -55dbu level input.
    • When using Input 2:
      • +10dbu/SPKR position: When connecting a speaker or any other higher line level audio input.
      • -10dbu/Line position: When connecting a regular line level input of -10dbu.

    My transmitter seems to have lost power/range.

    • Make sure that the antenna is connected properly.
    • Make sure that the RF power switch is in the correct position.
    • A more efficient transmit antenna may be needed.

    Can this transmitter be powered with a DC voltage?

    • NO. The transmitter must use the supplied 15VAC power supply.

    Can I use this transmitter with other manufacturer's receivers?

    • YES. Please refer to the frequency compatibility charts in the manual or on the website for channel conversions. When using other manufacturers products, SQ (Super Quiet) must be turned OFF.