A picture of a Meeting House Transmitter.

Meeting House Transmitter

Item:MH-800-072-01

The MH-800-072-01 is an LT-800-072-01 with customized settings. The MH-800 has outstanding audio quality and can be used in a variety of applications. The MH-800 connects to the main audio system, to broadcast a high quality audio signal to receivers distributed to the meeting house audience. The end result is hearing loss audience members can hear and understand the message better because they have their own receiver and headset. The signature Look & Listen™ LCD shows channel, lock, programming and RF power.

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Includes

One (1) MH-800-072-01 Meeting House Transmitter (LT-800-072 with customized setting)
One (1) LA-207 Power Supply for LT-800
One (1) Line Cord
One (1) Quick reference card

Highlights

  • Superior audio quality – setting the industry’s sound quality standard
  • 57 channels
  • 100% Digital – Listen transmitters are digitally-tuned so the transmission won’t drift
  • Use up to six (6) simultaneously on 72 MHz
  • Look & Listen™ LCD shows channel, channel lock, and programming information
  • Balanced/Unbalanced Inputs – you can 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
  • Many accessory options make Listen products ideal for a wide range of applications

Also Needed

Helical Top Mounted Antenna 72 MHz

Helical Top Mounted Antenna (72 MHz)

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Product photo of coaxial cable rolled up with a remote antenna attached

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SKU: LA-116
Universal RF Antenna for 72 MHz and 216 MHz

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Portable Programable Display RF Receiver (72 MHz)

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A picture of a Meeting House Receiver.

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SKU: MH-4200-072-P1

Specs

+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 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 2Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohm
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 ohm
Headphone OutputFront panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm

+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
ProgrammingSQ on/off, process 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 Range72.025 - 75.950 MHz
Number of Channels17 wide band, 40 narrow band
Frequency Accuracy± .005% stability +32º to +122 ºF (0º to +50 ºC)
Antenna TypeVarious antennas available
Transmitter Stability50 PPM
Transmission RangeUp to 1,500 ft. (457 m)
Antenna ConnectorBNC
Output Power80,000 uV at 3 m
Number of Simultaneous Transmitters6

+Power

Power SupplyIn line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
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)
ColorDark Grey with white silk screening
Unit Weight with Power Supply3.5 lbs. (1.6 kg)
Shipping Weight6.0 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)

+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

SafetyRoHS
RFFCC Part 15, Part 90, Industry Canada

Accessories

Helical Top Mounted Antenna 72 MHz

Helical Top Mounted Antenna (72 MHz)

SKU: LA-101
Long, thin, black telescoping top mounted antenna

Telescoping Top Mounted Antenna (72 MHz)

SKU: LA-106
RG-58 50 Ohm Coaxial Cable measured and cut by the foot

RG-58 50 Ohm Coaxial Cable (500 ft)

SKU: LA-112-500
Photo of coaxial cable rolled up around a wooden case

RG-8 50 Ohm Low-Loss Coaxial Cable (500 ft)

SKU: LA-113-500
Product photo of coaxial cable rolled up with a remote antenna attached

Coaxial Dipole Remote Antenna (72 MHz)

SKU: LA-116
Universal RF Antenna for 72 MHz and 216 MHz

Universal Antenna Kit (72 and 216 MHz)

SKU: LA-122
A picture of a 90 Degree Helical Antenna (72 MHz)

90 Degree Helical Antenna (72 MHz)

SKU: LA-123
Remote Antenna (72MHz)

Antenna Kit for Rack Mount (72 MHz)

SKU: LA-125
RG-58 BNC Connector

RG-58 BNC Connector

SKU: LA-127
A picture of a RG-8 BNC Connector

RG-8 BNC Connector

SKU: LA-128
Rolled up coaxial cable

RG-58 50 Ohm Preassembled Coaxial Cable

SKU: LA-391
RG-8 50 Ohm Preassembled Coaxial Cable wrapped up

RG-8 50 Ohm Preassembled Coaxial Cable

SKU: LA-390
2-way RF antenna combiner product

2-Way RF Antenna Combiner

SKU: LA-80
4-way Radio Frequency Antenna combiner

4-Way RF Antenna Combiner

SKU: LA-81
6-way radio frequency antenna combiner

6-Way RF Antenna Combiner

SKU: LA-82
A picture of 12 VDC Replacement Power Supply for LT-800

12 VDC Replacement Power Supply for LT-800

SKU: LA-207

Assistive Listening Notification Signage Kit

SKU: LA-304
Coupler

BNC Coupler

SKU: LA-115

FAQs

+Can this transmitter be powered with a DC voltage?

Yes. The transmitter must use the supplied 12 VDC power supply.

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

The receiver may be out of range of the transmitter.

+I can't change the channel on my transmitter, help?

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, help?

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.

+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.

+How many RF transmitters can I have operating simultaneously?

72 MHz: 8 simultaneous transmissions

+What does the LT-800 Transmitter "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 LT-800 Transmitter "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 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

+Can I use the LT-800 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.

+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.

+Is there a limit to the number of transmitters I can use in one room?

Yes. The 72 MHz LT-800-072 has a maximum of (8) eight.

+Does the LT-800 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?

Each audio source requires a transmitter.

+How many receivers can I have on a system?

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".

+What is the range of the LT-800 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 305 m (1000 ft.) from the transmitter can be achieved.

+What type of microphones can I use with the LT-800 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.