Architectural Specifications; Specifications - Listen Technologies LR-300 User Manual

LR-500 Specifications

Architectural Specifications

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 specified.

Specifications

RF
Audio
Specification
RF Frequency Range
Number of Channels
Sensitivity
Frequency Accuracy
Antenna
Antenna Connector
Squelch
Compliance
System Frequency Response
System Signal to Noise Ratio (A-weighted) SQ™ enabled: 80dB;
System Distortion
Output
LR-500-072
72.025-75.950 MHz
57 (17 wide, 40 narrow)
.6uV typical, 1 uV maximum for 12dB SINAD
± .005% stability 32 to 122º F (0 to 50º C)
Uses earphone cable
3.5 mm connector
Programmable in 20 steps
FCC Part 15, Industry Canada
** All system specifications are wireless end-to-end
63 Hz-15 Hz (±3dB)
SQ™ disabled: 60dB
< 2% total harmonic distortion (THD) at 80% deviation
3.5 mm connectors, unbalanced, 0dBu nomial output level, 16mW maximum,
impedance 32 Ohms
LR-500-216
216.025-216.975 MHz
57 (19 wide, 38 narrow)
63 Hz-10 kHz (±3dB)
SQ™ enabled: 80dB;
SQ™ disabled: 50dB
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