Listen LR 400, Design Manual & Manual

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LT-800
LR-400/500
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The receiver shall be capable of seeking channels. The device shall be able to be locked on a single
channel. The device shall have an adjustable squelch. The device shall have an audio frequency
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user to plug in either a mono or stereo headset. The device shall incorporate an LCD display that
indicates channel, battery level, low battery, battery charging, and RF signal strength. The receiver
shall be able to function in both DX and Local mode. The unit shall operate off of 2 AA batteries. The
receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The
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s LR-500-863
RF
RF Frequency Range 863.050 - 864.950 MHz
Number of Channels 17 Wideband
Sensitivity .6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50º C)
Antenna Integrated External Antenna
Squelch Programmable in 20 steps, automatic on loss of RF signal
Compliance CE, ETSI, RoHS
Audio
System Frequency
Response 50 Hz - 15 kHz (+/-3 dB)
System Signal to Noise
Ratio 70 dB (A-Weighted)
System Distortion <2% total harmonic distortion (THD) at 80% deviation
Output 3.5 mm connector, unbalanced, 0dBu nominal output level, 16
mW maximum, impedance 32 Ohms
Controls
User Controls Channel up/down, SEEK, volume
Set-up Controls (battery
compartment) Alkaline/NiMH battery switch
Programming Channel Lock Out, Channel Lock, DX/Local, squelch
Indicators
LED Red, illuminated when unit is on. Flashes when batteries are
low, or Charging. Flashes when locked and SEEK is pushed.
LCD Display Channel Designation, lock status, signal strength indication,
programming
Power
Battery Type Type: 2 AA batteries, alkaline or NiMH
Battery Life (Listen bat-
teries) 20 hours alkaline (LA-361), 10 hours NiMH rechargeable (LA-
362)
Battery Charging (NiMH
only) Fully Automatic, 13 hours maximum
Physical
Dimensions (H x W x D) 5.0 x 3.0 x 1.0 in (13 x 7.6 x 2.5 cm)
Color Dark Grey with white silk screening
Unit Weight 3.9 oz (111 g)
Unit Weight with batteries 5.8 oz (164 g)
Shipping Weight 1.0 lbs. (0.45 kg)
Door Manually Lockable. Up, down, and power buttons through door.
Other controls behind door (see controls)
Environmental
Temperature - Operation -10 C (14 F) to +40 C (104 F)
Temperature - Storage -20 C (-4 F) to +50 C (122 F)
Humidity 0 to 95% Relative Humidity, non condensing
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