III-C.
Special
Features:
ISO,
IFB,
and
Split-Feed
Headset
Operation
Refer
to
the
printed
circuit
board
dia-
only
while
the
designated
channel's
Talk
gram
(page
35)
for
jumper
locations.
toggle
is
switched
to
the
momentary
(ON)
position.
The
PIC-4
mutes
the
program
The
MS-400A
(similar
to
the
RM-400A
and
audio
in
response
to
the
signalling
SB-412A)
provides
you
with
the
capabili-
voltage
that
the
IFB
circuitry
sends
on
ty
to
convert
any
one
or
more
of
its
the
IFB
channel.
Converting
a
channel
channels
from
regular
two-way
operation
to
IFB
operation
requires
two
jumpers:
a
to
either
ISO
or
IFB
operation,
simply
47k
ohm
resistor
(1/4
or
1/7
watt)
for
by
adding
one
or
two
jumpers
in
the
the
pin
sockets
of
R136,
R143,
R150,
or
selected
channel's
circuitry.
R157
(corresponding
to
channels
A,
B,
C,
and
D)
AND
the
diode
listed
above
in
the
The
channel
ISO
function
is
engaged
only
ISO
conversion
procedure.
while
the
channel's
Talk
toggle
is
in
the
momentary
"(ON)"
position.
Channel
The
other
special
feature
that
involves
ISO
causes
the
MS-400A
operator's
voice
an
internal
jumper
is
"split
feed"
for
feed
to
all
other
channels
to
be
inter-
the
headsets
(program
in
one
ear,
inter-
rupted
(except
those
also
in
the
momen-
com
in
the
other).
In
most
systems,
the
tary
(ON)
position),
so
the
operator
may
program
and
intercom
audio
are
combined
talk
with
the
selected
channel
isolated
in
both
the
headset
and
speaker
outputs.
from
the
rest
of
the
system.
To
set
up
By
removing
the
220k
ohm
resistor
from
an
ISO
channel,
add
a
diode
(1N4148
the
pin
sockets
for
R9,
you
prevent
type)
to
the
pin
sockets
for
D30,
D32,
program
audio
from
being
part
of
the
a
D34,
or
D36
which
correspond
to
the
intercom
headset
output.
Next,
connect
channels
A,
B,
C,
and
D.
the
program
headset
output
(the
white/brown
wire
coiled
up
near
the
IFB
operation,
used
extensively
for
front
panel)
to
Pin
4
of
a
6-pin
XLR
cueing
Talent,
causes
muting
of
program
insert,
which
you
substitute
for
the
audio
and
simultaneously
switches
the
standard
4-pin
one.
Connect
the
inter-
cueing
station's
Talk
feed
for
the
in-
corn
headset
output
to
Pin
5;
Pins
3
and
tercom
to
the
IFB
channel(s).
In
addi-
6
are
circuit
common.
The
program
will
tion
to
jumpers
in
the
Ms-400A,
IFB
be
in
the
left
ear,
the
intercom
will
be
operation
requires
a
PIC-4
(which
sup-
in
the
right.
See
diagram
below
for
the
ports
up
to
four
separate
IFB
channels).
wiring
detail
of
the
connector.
Like
ISO,
the
IFB
circuitry
is
active
100
pF,
I
KV
CAP
,BLK
WHT/BR
/
BU
BLK<
HEADSET
CONNECTOR
*
6-PIN
INSERT:
*
WIRING
SIDE
23
(30 pages)
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