The
two
150-ohm
windings may
be used
separately
as two
isolated
150-ohm
outputs. Terminals
1 and
2,
and
3 and 4
will
each
provide
a
150/600-ohm output when the strapping
is
removed.
When
using
dual outputs,
the
mixer output levels will
each
be
reduced
by approximately
6 dB.
Additional
amplification
may
be
necessary
to
insure sufficient gain under these operating
conditions.
1
50/600
n#1
1
50/600
n
#2
Unbalanced—
The transformer can
be
bypassed to achieve an
unbalanced
600-ohm
output
at
the phone jack
marked
"600n
Direct.”
The
jack
can also be used to
feed
another
bridging input
when
the
balanced
600-ohm line is being used
for other service.
Monitor—
The
output
of
the monitor
amplifier
is
available on the
front
panel
and
the
phone jack
marked "Monitor" on the rear
panel.
The
output signal
is
unbalanced
and
unequalized
for
use
with
a
600-ohm
load.
Grounding
Input—
Each
microphone
circuit
is grounded to the chassis at the
printed
circuit
board
input.
Any additional
connection between
the
circuit
and
chassis or ground may cause hum.
Output—When
the balanced output
of
the 5306 is
connected to
a power
amplifier
that
does
not
have
an isolation
transformer,
the
circuit-to-chassis
connection at the
power amplifier must be
removed.
However,
it is
necessary to make sure that the two
chassis
remain
electrically
connected.
If
the
chassis are mounted in the
same
rack
cabinet or if
both units have 3-wire
power cords, this
condition
will
be
met.
A
binding post is
provided
for
use in the
event
that
no
other ground connection exists.
When the
output
trans-
former
has
been
bypassed and the 5306 is
used with a device that
does
not
have
an
input
transformer, the shield
of
the
connecting
cable
must
be grounded
at
both ends.
System
Gain
Adjustment
To insure
that optimum
signal-to-noise ratios are
maintained
when
the
5306
is
used with
additional equipment
between
it and
the
power
amplifier,
the
gain
of
the
auxiliary devices
must
be
adjusted
so that the
5306
is
allowed to run at
normal
levels,
i.e. 0
to
-i-8
dBm.
If
any
of
these devices do not have
input
attenuators, then
a fixed
network
must be
constructed
or
a variable attenuator
provided.
Extra gain in these
devices
must
be individually
attenuated and
the
final
system
gain
setting
made
at the power
amplifier
gain control. Care
must
be taken to insure
that
no
component is being overdriven.
Operation
Master Gain—
The Master
Gain allows the
operator to
adjust
the level
of
all
inputs simultaneously.
It is
a
feedback
control
that prevents overdriving
of
the
mixer
circuits
and the internal
amplification
stages.
Mixing
Controls—
The program and microphone
controls should
be positioned
at
"5"
for
average input signal
levels. The
VU
meter
has
been
calibrated
to
indicate
approximately
0 VU at
a
line level of
-i-8
dBm; an
access
hole
is provided
on
the top
cover
for
readjustment.
Amplifiers that follow
the
5306 must have
their
attenuation controls properly
set
to keep from
over-
driving
the
system. It should be
remembered
that the
5306
is
capable of
producing +24
dBm before
audible
clipping.
The
microphone
channel overload
indicators
will operate
when
the
signal
peaks are
3
dB
below clipping; the
input level
at
which
this
occurs is dependent
upon the setting of
the channel
gain control.
As
an
approximation,
at
a
setting
of
"2",
a
-2
dBm level
will
clip;
while
at
the
maximum
setting, the
clipping
level will
be
-22
dBm. Therefore,
loss
pad insertion
is usually
not necessary
to
attenuate
a high level input
signal. The
indicator
circuit
is designed
to
produce
noticeable flasher
activity before
clipping
occurs
and
before
distortion
reaches
audible levels.
This
progressive warning function
allows
the operator ample
time to
make any
necessary gain
adjustments.
Equalizer
Controls—The
detented equalizer
controls are marked
in 3
dB steps
of
boost and
cut at 20 Hz and
20 kHz to
a
maxi-
mum
of +
1
5 dB.
They do
not
affect
midrange program
material, nor
do they
affect
the monitor
output.
Monitor
Gain—Since the front
and rear monitor
outputs
are
paralleled,
their levels are
adjusted simultaneously
by
a
single gain
control.
Monitor
output is not affected
by the Equalizer controls.
20
100
1000
10,000 20,000
FREQUENCY
IN
Hz
Equalization—
The Equalizer controls
affect
output of the 5306
below 300
Hz and above
2000
Hz.
Note that they
do
not
affect
midrange
program material.
s
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