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LR-400

LR-400 Specifi cations
Architectural Specifi cations

The FM receiver shall be capable of receiving on 57 wide and narrow band channels with a SNR of

80dB or greater. The receiver shall be capable of seeking channels. The device shall have an

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

72 MHz, or of 63 Hz to 10 kHz, ± 3dB at 216 MHz. The device will incorporate a stereo headset jack

that allows the user to plug in either a mono or stereo headset and listen to the audio normally. The

device shall incorporate an LCD display that indicates channel, battery level, low battery, battery

charging, RF signal strength and channel lock status. The receiver shall incorporate automatic

battery charging circuitry for recharging of NiMH batteries. The Listen LR-400 is specified.

Specifi cations

Specifi cation LR-400-072 LR-400-216

RF
RF Frequency Range 72.025-75.950 MHz 216.025-216.975 MHz
Number of Channels 57 (17 wide, 40 narrow) 57 (19 wide, 38 narrow)
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 Programmable in 20 steps
Compliance FCC Part 15, Industry Canada
** All system specifi cations are wireless end-to-end
Audio
System Frequency Response 63 Hz-15 Hz (±3dB) 63 Hz-10 kHz (±3dB)
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB;
SQ™ disabled: 60dB SQ™ enabled: 80dB;
SQ™ disabled: 50dB
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 and SQ™ enable/disable and programmable squelch setting
User Controls Volume, channel UP/DOWN/SEEK (All controls except volume are electronically
lockable, and are behind the door)
Programming Squelch can be adjusted for sensitivity and signal capture control. Channel selection
can be locked by holding the SEEK button for 5 seconds. Unit cannot be programmed
to seek only used channels, however, it is capable of entering squelch mode.
Indicators
LCD Display Indicates channel, RF signal strength, lock status, and squelch setting
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/carrying 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. UP, DOWN and SEEK protected by 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