RF Transmitter/Receiver

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RF Transmitter/Receiver

Stationary RF Transmitter

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Offering outstanding audio clarity, digital signal strength, and 57 selectable channels, the perfect RF transmitter choice for a wide range of applications. Connected to your main audio system, the transmitter broadcasts strong, reliable audio to both belt pack receivers and stationary receivers, ideal for providing listeners with the best possible assistive listening experience.

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
  • 57 available, selectable channels
  • VU level meter and test tone for simple installation and setup
  • 30-day, no-obligation demonstration available for your venue or business

Offering outstanding audio clarity, digital signal strength, and 57 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 strong, reliable audio to both belt pack receivers and stationary receivers, ideal for providing listeners with the best possible assistive listening experience.

Includes

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

 

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
  • 57 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

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)

 

Environmental

  • Temperature: Operation- -10 °C (14 °F) to 40 °C (+104 °F)
    Storage- -20 °C (-4 °F) to 50 °C (+122 °F)
  • Relative Humidity: 0 to 95% relative humidity, non-condensing

 

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 305 m (1,000 ft.)
  • 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: 21.5 cm (8.50 in.)
  • Height: 4.5 cm (1.75 in.)
  • Depth: 23 cm (9.13 in.)
  • Color: Dark Grey with white silk screening
  • Unit Weight with Power Supply: 1.6 kg (3.5 lbs.)
  • Shipping Weight: 2.7 kg (6.0 lbs.)
  • 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: 1.2 kg (2.6 lbs.)

 

Compliance

  • Safety: RoHS
  • RF: FCC Part 15, Part 90, Industry Canada

 

* Specifications subject to change without notice.

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.

What is the range of ListenTALK units?

ListenTALK (North America Mode) units have a range of up to 200 m depending upon conditions, (Europe/Australia Mode) units have a range of up to 300 m depending upon conditions. These are “line of sight” specifications.

ListenTALK can have up to 10 groups in “one area”. What does “one area” consist of?

One area consists of the typical range, which is 100 m indoors and 200 m outdoors depending on conditions (North America) and 150 m indoors and 300 m outdoors depending on conditions. (Europe version)

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