Listen LA-140 Reference guide

LA-140 Quick Reference Card
Power (Red):
This red LED is lit when
there is power to the radiator.
No Connection (Yellow):
This yellow LED indicates a coaxial
cable fault. If illuminated, the radiator
is either not connected to a powered
transmitter or another radiator.
Carrier Present (Green):
This green LED is lit when there is
signal present to the radiator.
During normal operation the red
and green LEDs will be continuously
lit (unless SW1 is o).
© 2015 Listen Technologies Corporation®All Rights Reserved 04092015

LA-140 Quick Reference Card
RF Input:
Input RF signal from a
transmitter or radiator here.
RF Output:
Output RF signal to an
additional radiator here. Power Input: Connect power here.
Delay Compensation Switch:
Adjust the amount of signal delay
to this radiator. In single radiator
systems the position of this switch
does not matter, in multiple
radiator systems this switch must
be set properly.
See manual.
Termination Switch: If there is
no RF being output from the RF
Output connection, this switch
must be in the “ON” position.
Default: ON
Power Output: Output power
to an additional radiator here.
LED Indicator
Shuto Switch
(SW1): Controls
LED indicators on
front of radiator.
Default: ON
Listen mode (SW2):
if using a LA-140
Radiator with another
manufacturer’s
transmitter/modulator,
it is necessary to put
this switch in the OFF
position. IMPORTANT:
Always ensure SW2
is in the ON position
when using a LT-82
Transmitter. Default: ON
© 2015 Listen Technologies Corporation®All Rights Reserved 04092015
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