7

LR-500

LR-500 Specifi cations
Architectural Specifi cations

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

80dB or greater. The receiver shall be programmable to electronically lock out unneeded channels.

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 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. The device shall incorporate an LCD display that indicates

channel, channel lock or lock status, battery level, battery charging, and RF signal strength. The

receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The

Listen LR-500 is specifi ed.

Specifi cations

Specifi cation LR-500-072 LR-500-216

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 Programmable channel selection (see below), alkaline/NiMH batteries and squelch,
SQ™ enable/disable
User Controls Volume, channel UP/DOWN/SEEK. All controls except volume are electronically
lockable
Programming Unit can be programmed so that only desired channels are displayed. Squelch can be
adjusted for sensitivity and signal capture control. Channel selection can be locked by
holding the SEEK button for 5 seconds.
Indicators
LCD Display Indicates channel, RF signal strength, lock status, squelch, battery power level and
channel programming
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. UP, DOWN and SEEK through door, other controls behind door
(see Controls above)
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