Stations are unique to the industry and packed with special features and capabilities.
There are three modes of operation:
1. Press-to-talk, release-to-listen using the speaker
as the microphone
in the talk mode,
2. Full duplex, simultaneous talk/listen when a close-talking, noise-canceling gooseneck
is plugged in.
3. As a headset
station when a headset
is connected instead of a gooseneck mic
The full duplex feature will work in moderately noisy environments because of the deep cut in sidetone automatically applied when the LS3
senses that a microphone
has been connected but not an earspeaker. In this mode, sidetone can be adjusted with a front panel recessed screwdriver adjust control which is rotated until any feedback
is suppressed. When the LS3
senses a headset
, sidetone is automatically restored to a setting which is fixed, but ideal for use with a headset
Since LS3s are likely to be used in remote locations, they are subject to having their front panel controls left in positions that will prevent communications from the Master
Station. The level
can be turned down, the speaker
switch left in the Off position etc. Pro Intercom Master
Stations are all equipped with an override tone generator. When this inaudible tone is sent out and received by an LS3
, it automatically shifts to a predetermined group of settings, restoring volume
, and resetting the speaker
setting to Listen. The choices of these override settings are determined by the positioning of links on the rear of the LS3
's circuit board, and fully explained in the instructions. When override is controlling the LS3
, a green LED
lights on the front panel.
version is mounted on a thick, sturdy aluminum
plate for flush mounting and fits a U.S. 6-gang electrical box. Circuit connections are via a plug-in terminal strip
on the rear. The mating plug
The multi-circuit model of the LS3
is designated the LS3M
version is fitted into a heavy metal enclosure
with keyhole slots on the back and plastic feet
for desktop use. Circuit connections are via XLR
connectors on the top/back.
The multi-circuit version of the LS3T
is designated the LS3MT.