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LR-300

LR-300 Specifi cations
Architectural Specifi cations

The FM receiver shall be capable of receiving on 17 wide band channels and have a SNR of 80dB

or greater. The receiver shall be capable of seeking channels. The device shall have a squelch. The

device shall have an audio frequency response of 63 Hz to 15 KHz, ± 3dB at 72 MHz. The device shall

incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset

and listen to audio normally. The receiver shall incorporate automatic battery charging circuitry for

recharging of NiMH batteries. The Listen LR-300 is specified.

Specifi cations

Specifi cation LR-300-072

RF
RF Frequency Range 72.025-75.950 MHz
Number of Channels 17 (wide band)
Sensitivity .6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy ± .005% stability 32 to 122º F (0 to 50º C)
Antenna Uses earphone cable
Antenna Connector 3.5 mm connector
Squelch Automatic on loss of RF signal
Compliance FCC Part 15, Industry Canada
** All system specifi cations are wireless end-to-end
Audio
System Frequency Response 63 Hz-15 kHz (± 3dB)
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB; SQ™ disabled 60dB
System Distortion < 2% total harmonic distortion (THD) at 80% deviation
Output 3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,
impedance 32 Ohms
Controls
Set Up Controls Alkaline/NiMH batteries, SQ™ enable/disable
User Controls Volume, SEEK (Channel SEEK is electronically lockable)
Programming Channel selection can be locked by holding the SEEK button for 5 seconds
Indicators LED Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charg-
ing. Flashes when locked and user attempts to seek to another channel.
Power
Battery Type Two AA batteries, alkaline or NiMH
Battery Life (Listen batteries) 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging (NiMH only) Fully automatic, 14 hours
Power Supply Connector 2.3 mm OD by 0.7 mm ID, barrel type connector. 7.5VDC, center positive <250mA.
Drop in contact points for use with Listen charging cases
Compliance UL Listed
Physical
Dimensions W x D x H 3.0 x 1.0 x 4.25 in. (7.6 x 2.5 x 13 cm)
Unit Weight 3.9 oz. (111 g)
Unit Weight with batteries 5.8 oz. (164.4 g)
Shipping Weight 1.0 lbs. (453.6 kg)
Door Manually lockable. SEEK behind the door.
Environmental
Temperature - Operation 14 to 104º F (10 to 40º C)
Temperature - Storage -4 to 122º F (-20 to 50º C)
Humidity 0 to 95% relative humidity, non-condensing