LR-42

Includes:
LR-42 Receiver
LA-152 Alkaline Battery Compartment


architectural specifications
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 58 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 batteries. The receiver shall be covered by a limited lifetime warranty. The LR-42 is specified.

	Specification	LR-42 Stethoscope Receiver
RF	Frequency Range	2.3 MHz - 3.8 Mhz
	Number of Channels	4 selectable channels
	IR Detectors	2 detectors under front IR lens
	Sensitivity	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
Audio	-- All system specifications are wireless end-to-end
	System Frequency Response	63Hz - 15kHz (+/- 3dB)
	System Signal to Noise Ratio (A-weighted)	> 58dB
	System Distortion	< 2% total harmonic distortion (THD)
	Audio Output Jacks	None. Built in Stethoscope speakers
	Audio Output Power	20 mW maximum at 32 ohms
Controls	User Controls	Volume, Power, Channel Select
	Programming	Channel Lock, Auto Find, Auto Seek, Auto Shut-Off, Audible Option
Indicators	Unit Power	Indicated by current channel selection LED
	Channel Selection	Red LED illuminates on the current channel selection
	Audible Indicator	Audio beep in headset indicates low batteries, channel lock, power on/off. Can be disabled in programming mode. Default: On
Power	Battery Type	Two AAA alkaline batteries or NiMH battery pack
	Battery Life	30 hours alkaline, 15 hours NiMH rechargeable pack (LA-364)
	Battery Charging	Fully Automatic with NiMH battery pack and LA-350 charger
Physical	Dimensions (W x D x H)	1.8 x 4 x .75 inches (46 x 102 x 19 mm) Stethoscope Arm length 8 inches (203 mm)
	Color	Dark Grey with White Silk Screening
	Unit Weight without batteries	1.75 ounces (49 grams)
	Unit Weight with batteries	2.95 ounces (85 grams)
	Shipping Weight	8 ounces (227 grams)
Environmental	Temperature - Operation	-10 C (14 F) to +40 (104 F)
	Temperature - Storage	-20 C (-4 F) to +50 (122 F)
	Humidity	0 to 95% relative humidity, non-condensing

1. Power: Press to turn on the unit, press and hold turn the unit off

2. SEL: Press to change channels

3. Indicates operating channel 1 through 4

4. Indicates status of the batteries when the Power button is pressed momentarily

5. Removable battery compartment (AAA alkaline batteries or NiMH rechargeable battery pack)