Listen Technologies LA-350, LR-42, LR-44, LA-351, LT-82LA specs

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The IR stethoscope receiver shall be capable of receiving on four carriers (2.3, 2.8, 3.3, 3.8 MHz) and the channel shall be displayed on one of four front panel LEDs. The receiver shall be capable of being locked on a channel. The receiver shall be capable of receiving a stereo signal on each of the four carriers. The receiver shall have a SNR of 60 db or greater and have built in squelch control. The device shall have an audio frequency response of

63 Hz to 15 kHz, +/- 3db and shall have distortion of less than 2%. The device shall operate for 30 hours with two AAA alkaline batteries and 15 hours with two AAA NiMH rechargeable

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		Specifications	LR-42

		Carrier Frequencies	Selectable: 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz

		Number of Channels	Four (4) selectable channels

		IR Detectors	Two (2) detectors under front IR lens
	RF
	RF	Sensitivity	One (1) nW/cm2 at 40 db SNR

		Frequency Accuracy	+/- .005% stability 0 to 50C

		Squelch	Automatic on loss of RF signal (40 db SNR)

		Compliance	FCC Part 15, Industry Canada, CE, RoHS


		** All system specifications are wireless end-to-end

		System Frequency Response	63Hz - 15kHz (+/- 3dB)

		System Signal to Noise Ratio	Mono: >60dB
	Audio	(A-weighted)	Stereo: >52dB

		System Distortion	<2% total harmonic distortion (THD)
		Audio Output Jacks	3.5 mm connector unbalanced, mono or stereo headphones
		Audio Output Power	20 mW maximum at 32 ohms

	Controls	User Controls	Volume, Power, Channel Select
	Controls	Programming	Channel Lock, Auto Seek, Channel Lock-Out, Squelch
		Programming	Channel Lock, Auto Seek, Channel Lock-Out, Squelch


	Indicators	Unit Power	Indicated by current channel selection LED

		Channel Selection	Red LED illuminates on the current channel selection
		Channel Selection	Red LED illuminates on the current channel selection


		Battery Type	Two (2) AAA alkaline batteries or NiMH battery pack
	Power	Battery Life	30 hours alkaline, 15 hours NiMH rechargeable pack
	Power		(LA-364)
			(LA-364)

		Battery Charging	Fully Automatic with NiMH battery pack and LA-350 charger


		Dimensions (H x W x D)	1.8 x 4.0 x .75 in (46x102x19 mm) Stethoscope Arm length 8 in (203 mm)
		Color	Grey with White Silk Screening
	Physical	Unit Weight without batteries	1.75 oz. (49 g)
		Unit Weight with batteries	2.55 oz. (74 g)

		Shipping Weight	8.00 oz. (227 grams)


		Temperature - Operation	-10 C (14 F) to +40 (104 F)

	Environmental	Temperature - Storage	-20 C (-4 F) to +50 (122 F)

		Humidity	0 to 95% relative humidity, non-condensing

•Specifications are subject to change without notification.

LR-LALT-Design-8214042/44Guide

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Listen Technologies LA-350, LR-42, LR-44, LA-351, LT-82LA manual ,56WHWKRVFRSH5HFHLYHU6SHFLÀFDWLRQV

Contents

Page Page VHUYLFHZH·UHKHUHWROLVWHQ +HUH·VKRZWRUHDFKXV Page Stationary Infrared Table of Contents Page Page Page Stationary Infrared Design Guide Table of Contents Design Guide Infrared Technology Overview Single Channel System System Overview Multi-channel system Multiple Channel System Maximum length of CAT-5 power cable Each LT-82 transmitter used can power two LA-140 radiatorsKey Concepts of Designing a Stationary IR System Maximum length of coaxial RF cable Determine the number of audio channels Designing a SystemDetermine the room size and shape Complete the room layout worksheet Horizontal Polar Pattern Vertical Polar PatternSingle Channel System Designing a System Designing a System 3C Radiator Mounting Angle 3B Height of Radiators Determine the number of radiators required Complete the system layout worksheet 5E Cross out the unused power supplies 5D Draw a connecting line from the power supply output5F Write in the CAT-5 power supply cable lengths 5G Determine the delay compensation for each radiator 6A Transmitters Complete the system materials worksheet6B Transmitter Rack Mounting 6C Radiators 6H Other Accessories 6E Radiator Power Supplies6D Radiator Mounting Options Dual radiator mounting DesignDesign GuideGuide Page Room Layout Worksheet Page System Layout Worksheet Page DesignDesignLA-140GuideGuide DesignLT-82Guide Page USA System Materials WorksheetPage Page Page Page Page LT-82 Package Contents LT-82 User’s Manual Table of ContentsPage 6SHFLÀFDWLRQV Power LT-82 Block Diagram 7UDQVPLW/HYHO,QGLFDWRU6KRZVPLHGDXGLROHYHO LT-82 Quick Reference Connect LT-82 RF Signal to Radiators LT-82 Setup and Operating InstructionsUnpack the Product Mount LT-82s in Rack if desired Connect LT-82 Power to Radiatorsif desired Powering the LT-826B Press the Power button 7B RF-Off Channel Setting Information Select Operating Channel7A Select the operating channel 8B If using Input 8A If using InputConnect Audio Inputs 8C Test Tone if necessary Set Auto-Timeout Feature Set Stereo and Process Features $FFHVVRULHV Accessories for LT-82 DesignLT-82Guide DesignLTLT-82-82Guide DesignLT-82Guide Page Page Page Page LA-140 Package Contents LA-140 User’s Manual Table of ContentsPage $6SHFLÀFDWLRQV DUULHU3UHVHQW*UHHQ LA-140 Quick Reference Connect RF Signal LA-140 Setup and Operating InstructionsConnect Power Mount Radiator Set Delay Compensation Switch Set Termination SwitchSet LED Indicator Shutoff Switch SW1 Front LED Indicators Set Compatibility Switch SW29A Red LED 9B Yellow LED LA-140 Mounting your Radiator OverviewMounting Hardware Pieces Wall Box Mounting Installation StepsScrew Wall Box Plate to wall Attach Tilt Arm a Pull CAT-5 and Coaxial cables through if necessary Attach Safety Mounting CableDetermine correct angle Attach Radiator to Wall Box Plate Fasten Wall Box Plate to wall Hollow Wall Mounting 3XOO&$7DQG&RDLDOFDEOHVWKURXJKKROHLQDOO%R3ODWH Attach Safety Mounting Cable ‡&RUQHU0RXQW%UDFNHW Corner Mounting Attach Corner Mount Bracket Attach Radiator to Corner Mount Bracket Pull CAT-5 and Coaxial cables through Attach Safety Mounting Cable Attach Wall Box Plate securely to ceiling Ceiling Mounting Attach Tilt Arm a Attach Safety Mounting Cable Desk/Table Mounting DesignLALALT---140140Guide82 Attach Radiator to Desk/Mic Stand Attach Universal Bracket to Mic Stand Microphone Stand Mounting Determine correct angle setting Attach Universal Bracket to tripod stand Tripod Stand Mounting Attach Tilt Arm B Dual Radiator Mounting LA-205 LA-342 Accessories for LA-140 DesignLALA--140140Guide DesignLT-82Guide DesignLALA--140140Guide DesignLT-Guide82 Page Page Page Page LR-42/44 User’s Manual Table of Contents LR-42/44 Package ContentsListen Part Number Page ,56WHWKRVFRSH5HFHLYHU6SHFLÀFDWLRQV /DQ\DUG,55HFHLYHU6SHFLÀFDWLRQV LR-42 Quick Reference Press to turn unit on, press and hold to turn unit off LR-44 Quick Reference Determine Battery Type to be Used LR-42/44 Setup Instructions Place LA-364 battery pack in receiver Turn Unit On Connect an Earphone or Headset LR-44 model only Select Stereo/Mono Mode Setup Additional Programming if desiredSelect a Channel and/or Program Channel Selection Method Position the Unit on User’s Body LR-42/44 Operating Instructions LR-44 LR-42 3A Auto-Seek Disabled Default OFF 3B Auto-Seek EnabledTurn the Unit On 5A Auto-Seek Disabled Default OFF LED Sleep Mode5B Auto-Seek Enabled Select Listening Channel Adjust Volume Level Checking Battery Level and Current Channel7A Checking Battery Level Powering down the unit Auto Shut-Off Feature7B Checking Current Channel After 10 seconds Channel Unlock Procedure Channel Lock ProcedureLock Indicators LR-42/44 Locking Instructions Entering Program Mode Program Mode OverviewWhile in Program Mode LR-42/44 Programming Instructions 1DYLJDWLQJZLWKLQWKH3URJUDP0RGH Program Mode Functionality Diagram Channel Lock-Out Sub-Mode Functionality Diagram Channel Lock-Out Sub-Mode InstructionsWhile in Channel Lock-Out Sub-Mode Squelch Adjustment Sub-Mode Instructions While in Squelch Adjustment Sub-ModeSquelch Adjustment Sub-Mode Functionality Diagram Resetting to Defaults Exiting Program ModeThere are two ways to exit the program mode Programming Examples Example #1Example #2 Want to reset the unit to factory defaults Example #3Example #4 Example #5 Want to tighten the squelch setting to setting Stereo Mode Default is OFF Programmable Features Detailed DescriptionsChannel Lock-Out Default is All Channels Available Auto-Seek Default is Off How to Charge Batteries LR-42/44 Battery Charging Information1A NiMH Battery Pack LA-364 Requirements When the unit is seated correctly a red LED will light When the receiver is fully charged the green LED will lightPlace LR-42/LR-44 Receiver into a slot Place LA-364 battery pack into converted tray 114 LA-364 Accessories for LR-42/44 116 Page Page Page Page LA-350/351 User’s Manual Table of Contents LA-350 Package ContentsLA-351 Package Contents Page $6SHFLÀFDWLRQV $6SHFLÀFDWLRQV LA-350 Charging Requirements/Instructions Requirements to Charge ReceiversCharging Instructions Charging Scheme Install conversion tray3A To Charge Batteries while in Receivers 3B To Charge Batteries separate from Receivers Place LA-364 battery packs in converted charging slots Verify batteries are chargingVerify full charge Cord Tidy Rack LA-350/351 Cord Tidy Rack 129 130 Page Page Page Page Supplementary Information Table of Contents Page 7URXEOHVKRRWLQJ Troubleshooting SupplementaryDesignLALT--14082Guide UHTXHQWO\$VNHG4XHVWLRQV Frequently Asked Questions \UHFKDUJHDEOHEDWWHULHVGRQ·WODVWYHU\ORQJK\ RPSOLDQFH,QIRUPDWLRQ Compliance, Warranty and Contact Information Listen Technologies Corporation 14912 Heritagecrest Way