Listen Technologies LR-300 - Manual (Page 8)

6
LR-500 Specifications
LR-500 Specifications
Architectural Specifications
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 programmable to electronically lock out unneeded channels. The receiver shall be capable of seek-
ing channels. The device shall have an adjustable squelch. The device shall have an audio frequency response of 63Hz
to 15KHz, ±3dB at 72MHz, or of 63Hz to 10kHz, ± 3dB at 216MHz. 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 indi-
cates channel, channel lock or lock status, battery level, low battery, 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
Specification LR-500-072 LR-500-216
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
Frequency Accuracy
Antenna
Antenna Connector
Squelch
Compliance
System Frequency Response 63Hz - 15kHz (±3dB) 63Hz - 10kHz (±3dB)
System Signal to Noise Ratio
(A-weighted)
SQ enabled: 80dB; SQ disabled 60dB SQ enabled: 80dB; SQ disabled 50dB
System Distortion
Output
Uses earphone cable
<2% total harmonic distortion (THD) at 80% deviation
.6uV typical, 1 uV maximum for 12dB SINAD
3.5mm connector
3.5mm connectors, unbalanced, 0dBu nominal output level,
16mW maximum, impedance 32 Ohms
** All system specifications are wireless end-to-end
± .005% stability 0° to 50°C (32° to 122° F)
Programmable in 20 steps
FCC Part 15, Industry Canada
RF
Audio
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