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3
employing this speed,
headphones
should be
used for
monitoring.
Then
when
the
battery voltage
falls
to a
level unsatisfactory for recording
an alarm signal
will be heard in the phones.
It is well
to remember
..that
batteries used
uninterruptedly
for, say, an
hour,
will recuperate when
rested for,
say,
10 hours. Therefore exhausted batteries may
appear acceptable
during
a
quick
test before
recording, but
then collapse after a few
minutes use.
To recapitulate:
If
one
is recording at 15"
/ sec.
always use monitoring headphones
and
read
the
battery
meter
pessimistically.
If
one
is
recording at
7 1
/2"
or 3 3/4
11
/sec
.
for
fairly
short
periods, say
15 minutes, a battery test before starting
should be sufficient.
On the
other hand, if
the
recording
s
e
ssion is of
long duration,
the batteries
should
be
checked
when
changing reels.
7)
Pilot
Signal Indicator
This is an indicator
on which
a
white cross will appear
when the
Nagra
is
receiving the pilot
signal (N
eo
pilot Nagras
only).
8) Accelerator
Button
By pressing
this
button
the
motor
speed is
increased
to its maximum.
This
can
be done
during play-back for
forward spooling.
Although no damage
will
be
done
by pressing the
button
during
recording,
the speed
will
be
incorrect.
9) Function Selector Switch
This
switch controls
the
functioning of
the
Nagra.
It
has
two
sets
of
six
positions.
One set
is
for
working
on internal batteries when
the
end of the
switch
knob marked "bat" is used
as
an indicator, and
one set is
for
working
with
an external
power
supply,
when
the other end of the
knob, marked
II
e
x
t",
is
used
as an
indicator.
The positions
are as
follows:
STOP
in the
centre
TESTING
to
the right
In
this position
the
amplifiers are
connected but not the motor, so that
the
incoming signal to be recorded
can be checked.
The monitoring phones
are
connected
to the
record amplifier.
HI-FI RECORD
=
Normal
recording position.
The phones are
connected
to the play-back
amplifier, so
that the
actual
recording that has been made
is
monitored. Incoming signals
can
be mixed
from
both
microphone
and
line inputs. The level
of
each
of these
signals
can
be
adjusted
by
the
appropriate
volume controls.
If the line
input
is
only
used,
the microphone level
potentiometer should
be turned
fully
anticlockwise to
prevent the recording
of
noise
from
the
microphone pre-
amplifier. On
the other
hand, if
a
recording
is
made
through
the microphone
channel only,
the
position
of
the line input
volume control
is
immaterial.
AUTOMATIC RECORD
=
Recording
with
automatic
control of
level
and
attenuation of
low frequencies.
It
is
not
necessary to
adjust
the level potentiometer
but the quality
of
the recording is not as
good as
in
the
position HI-FI RECORD.
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