Clear-Com MS-222 User Manual

OPERATION
/
Clear-Com
MS-222
2-Channel
Main
Station
*
3.1
FRONT
PANEL
DESCRIPTION
1.
Talk
Buttons
Each
channel
has
its
own
illuminated
"Talk"
button
for
activating
the
microphone
feed
to
a given
channel.
Mechanically
the
pushbutton
is
momentary
in
action,
however
electrically
the
button
has
dual
action
(momentary
or
latching)
depending
on
how
the
button
is pressed.
LATCHING:
Pressing
the
button
quickly
wil'loggle"
the
"alk"
function,
alternately
turning
it on
or
off.
MOMENTARY:
Pressing
the
button
for
longer
than
1/4
second
will
turn
the
button
press
into
a momentary
function
such
that
when
the
button
is
released
the
'Talk"
function
will
turm
off.
In
any
case
the
'Talk"
function
is activated
all of
the
time
the
button
is pressed.
TALK
INDICATION:
The
'Talk"
button
will
illuminate
dimly
indicating
when
a 'Talk"
is
activated.
CALL
INDICATION:
The
'Talk"
button
will
illuminate
brightly
when
a
"Call"
signal
is
received
on
that
channel.
2.
Call
Buttons
Each
channel
has
its own
"Call"
button.
Pressing
the
"Call"
button
at
any
time
will
send
a
"Call'
signal
on
that
channel
regardless
of
the
activation
of
the
"Talk"
circuit
for
that
channel.
The
"Talk"
button
for
that
channel
will
illuminate
brightly
while
the
"Call"
button
is
pressed
indicating
the
presence
of
a "Call"
signal
on
the
line.
3.
Listen
Level
Controls
Each
channel
has
a separate
"Listen
Level"
control.
Listening
is always
on
and
is
not
controlled
by
any
logic.
To
listen
to a
channel,
turn
up
the
appropriate
control.
To
not
listen
to
a channel,
turn
the
control
completely
off.
4.
Side
Tone
Controls
Each
channel
has
a "Side
Tone"
null
control.
This
control
is used
to set
the
amount
of
the
microphone
that
is
heard
in
the
earphone
from
that
channel.
This
control
is
a true
hybrid
null
control
and
therefore
is sensitive
to changes
in
line
loading.
For
headphone
use
h is
best
to
find
the
'null'
for
a given
channel
and
then
rotate
the
control
clockwise
to
obtain
the
desired
side
tone
level.
If the
speaker
and
panel
microphone
are
used
together
providing
a
possible
acoustic
feedback
path
it will
be
necessary
to
use
an
almost
complete
'null'
of
the
side
tone
control.
11/90
Rev.
1.0
Page
18

Clear-Com MS-222 Specifications

General

Brand	Clear-Com
Model	MS-222
Category	Intercom System
Language	English