QEI 675 - Operation; Operator Controls and Indicators (Front Panel)

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SECTION
3
OPERATION
3-1
OPERATOR
CONTROLS
AND
INDICATORS
(FRONT
PANEL)
l.
POWER
Switch
Sl
and
POWER
Indicator
CR2
This switch controls primary
power
to
the
unit.
The
LED
(CR2)
will
light
indicating
power
on.
If
the
LED
flashes,
it
indicates
a
power
supply overload or
an
extreme
RF
load mismatch.
2.
MULTIMETER
Switch
S2
and
MULTIMETER
Ml.
3.
4.
This switch controls the function monitored
by
the meter. A
list
of
multimeter readings
is
supplied
by
the
factory
with each
unit.
Since
these readings are only a
relative
indication,
it
is
recommended
that
they
be
checked
and
logged
periodically
so
that
any
excessive deviation
from
normal
will
be
recognized.
PWR
ADJ
Control
Rl
This screwdriver adjustment
can
be
used
to
vary the
RF
output
from
less
than 5 watts to over
20
watts.
If
the Exciter
is
to
be
used
below
app-
roximately
12
watts output,
it
is
recommended
that
the tap
on
the
power
transformer secondary
be
moved
to the
75%
point. This will
limit
the
maximum
output
power
to
less
than
12
watts but will cut
down
on
the
pri-
mary
power
consumed
and
lower heat
dissipation
within the
unit.
See
Section 5-6.
FREQ
ADJ
Control
R2
This screwdriver adjustment
can
be
used to
fine
tune the Exciter over a
range
of
approximately
2:_
500
Hz.
5.
AFC
LOCKED
Lamp
DSl
and
Socket
XDSl
This
lamp
indicates
when
the
FMO
is
.locked
to
the reference
crystal
·
as"".
cillator.
If
the
FMO
is
not locked
to
the
reference,
sensing
circuitry
will extinguish
lamp
DSl
and
shut
down
the
RF
output
of
the Exciter.
It
is
normal
for
this
lamp
to
light
and
RF
power
to appear within a
few
se-
conds
after
the Exciter
is
energized.
3-2
CONTROLS
AND
CONNECTIONS
(REAR
PANEL)
l.
MONO/COMP
Switch
S3
This .switch
selects
either
the
mono
or
stereo
input
signals.
In
the
mono
position,
the input signal
is
automatically pre-emphasized in accordance
with the
75
usec curve.
-8-