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productmanual 11x17.qrk
10/11/99 2:42 PM
Page 7
Listen Receivers: LR-500 and LR-400 Specifications
LR-500 Specifications
RF Frequency Range:
72MHz: 72.05 - 75.95MHz
216MHz: 216.025 - 216.975 MHz
Sensitivity:
.6uV typical, 1uV maximum for 12dB SINAD
Max deviation at ± 70kHz
Signal to Noise ratio:
wide band channels, 60dB
narrow band channels, 54dB
Frequency Response:
50Hz to 15KHz, ± 3dB
Distortion:
< 2% THD
Squelch:
40dB with loss of RF signal
Antenna:
Uses headphone cable
Available Channels:
72MHz: 17 wide band, 40 narrow band
216MHz: 19 wide band, 38 narrow band
Physical Dimensions:
3" W x 1"D x 5"H
(7.6cm W x 2.5cm D x 13cm H)
Weight:
< 1 lb. (.45 kg) with batteries
Door:
CHANNEL and SEEK buttons are accessible
through door, lockable
Programmability:
Allows only programmed channels to appear on the display, user
functions can be locked by pressing the Seek button for >3
seconds
Power:
Two AA batteries, high capacity alkaline or NiMH rechargeable;
external power connector 8-9 VDC, tip positive, <300mA
Battery Life:
40 hours with high capacity alkaline,
20 hours with rechargeable NiMH
Headphone Output:
750mV RMS maximum at 25kHz deviation,
32 ohms, 3.5MM mono or stereo
26
LISTEN TECHNOLOGIES CORPORATION +1.435.647.0318 1.800.330.0891 Fax: +1.435.647.0316
Internet: www.listentech.com
All specifications are subject to change without notice.
LR-400 Specifications
RF Frequency Range:
72MHz: 72.05 - 75.95MHz
216MHz: 216.025 - 216.975 MHz
Sensitivity:
.6uV typical, 1uV maximum for 12dB SINAD
Max deviation at ± 70kHz
Signal to Noise ratio:
Wide band channels, 60dB
Narrow band channels, 54dB
Frequency Response:
50Hz to 15KHz, ± 3dB
Distortion:
< 2% THD
Squelch:
40dB with loss of RF signal
Antenna:
Uses headphone cable
Available Channels:
72MHz: 17 wide band, 40 narrow band
216MHz: 19 wide band, 38 narrow band
Physical Dimensions:
3" W x 1"D x 5"H
(7.6cm W x 2.5cm D x 13cm H)
Weight:
< 1 lb. (.45 kg) with batteries
Door:
Channel and Seek buttons are located behind door, door can be
locked
Programmability:
User functions can be locked by pressing the SEEK button for
>3 seconds
Power:
Two AA batteries, alkaline or NiMH
rechargeable; external power connector
8-9 VDC, tip positive, <300mA
Battery Charging:
Fully automatic, <12 hours
Battery Life:
40 hours with high capacity alkaline,
20 hours with high capacity NiMH
Headphone Output:
750mV RMS maximum at 25kHz deviation,
32 ohms, 3.5MM mono or stereo
LT-800 Stationary Transmitter Controls & Audio Connections
LT-800 Front Illustration: Controls & Displays
INPUT: Adjust audio input
Indicates audio
Shows audio level
Indicates RF output power
levels of Inputs 1 and 2
input level of
after processing
(full, 1/2 or 1/4) –
Inputs 1 and 2
select on rear panel
Power ON/OFF
PROCESS: Adjust the amount of
CONTOUR: Adjust voice
audio processing – to make all audio
intelligibility equalization
Activates a tone to
sources sound like they are at the
for your application
aid tuning of non-
same level, adjust clockwise
requirements
Listen receivers
LT-800 Audio Connections
The LT-800 has two possible audio inputs:
INPUT 1 is used to connect a balanced mic or line level input.
INPUT 2 is used to connect an unbalanced, high impedance line input or speaker input.
LINE OUTPUT – the LINE
INPUT 2 CONNECTION:
INPUT 2 SWITCH: Select
OUTPUT connector is a mixed
this is a phono connector
LINE or SPEAKER on the slide
output of INPUT 1 and INPUT 2
used to connect an
switch directly next to the
after processing. This is an
unbalanced, high imped-
INPUT 2 connector. In the
unbalanced phono connector.
ance line or speaker input
line position, the input level is
The output level is –10dBm.
–10dBm, and on speaker, the
input level is +10dBm.
LISTEN TECHNOLOGIES CORPORATION +1.435.647.0318 1.800.330.0891 Fax: +1.435.647.0316
Internet: www.listentech.com
All specifications subject to change without notice.
Channel the unit
is tuned to
If decimal place
is lit, channel is
locked
Plug in a headset
then adjust volume
TO LOCK: press both UP and
SELECT
DOWN buttons simultaneously
CHANNEL
to lock channel; press both
again to unlock
INPUT 1 CONNECTION: Connect a
microphone or balanced line level
input. See Preparation instruction
#7 for details (Page 9).
INPUT 1 SWITCH: Select MIC or
LINE input on the slide switch. For Mic
input, the level is –55dBm and the
input impedance is 50 ohms. In the
line position, the input level is +4dBm
and the input impedance is 600 ohms.
TM
7
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