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

LR-400 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 capable of seeking 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 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.

Specifications

RF Frequency Range
Number of Channels
Sensitivity
Frequency Accuracy
RF
Antenna
Antenna Connector
Squelch
Compliance
System Frequency Response
System Signal to Noise Ratio
Audio
(A-weighted)
System Distortion
Output
26
Specification
57 (17 wide, 40 narrow)
** All system specifications are wireless end-to-end
SQ enabled: 80dB; SQ disabled 60dB
LR-400-072
72.025 - 75.950 MHz
.6uV typical, 1 uV maximum for 12dB SINAD
± .005% stability 0° to 50°C (32° to 122° F)
Uses earphone cable
3.5mm connector
Programmable in 20 steps
FCC Part 15, Industry Canada
63Hz - 15kHz (±3dB)
SQ enabled: 80dB; SQ disabled 50dB
<2% total harmonic distortion (THD) at 80% deviation
3.5mm connectors, unbalanced, 0dBu nominal output level,
16mW maximum, impedance 32 Ohms
LR-400-216
216.025 - 216.975 MHz
57 (19 wide, 38 narrow)
63Hz - 10kHz (±3dB)