QEI 675 - Installation; Initial Inspection; Preparation for Use

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SECTION
2
INSTALLATION
2-1
INITIAL
INSPECTION
Check
the shipping carton
for
external
damage.
If
the carton
exhibits
evi-
dence
of
abuse in handling
(holes,
broken
corners,
etc.)
ask the
carrier
agent to
be
present
when
the
unit
is
unpacked. Carefully
unpack
the
unit
and
inspect
all
equipment
for
physical
damage.
Immediately
after
unpacking,
any
bent or broken
parts
or
scratches
should
be
noted.
Keep
all
packing
material for proof
of
damage
claim
or
for possible future use.
2-2
PREPARATION
FOR
USE
The
unit
is
designed to
be
mounted
in a standard
19
11
rack. Air space should
be
provided
above
and
below
the
unit
so
that
heat generated
by
the
circuitry
may
be
dissipated.
Additional cooling
may
be
required
if
the
unit
is
placed
above high heat generating equipment in order to
keep
the ambient temperature
below
the
maximum
specified.
Mount
the
unit
to the rack using (4)
#10
countersunk screws
and
finishing
washers.
The
unit
requires a
105-125V
single
phase,
50
oi
60
Hz
power
source
or
a 210-
250V
single
phase,
50
or
60
Hz
power
source.
The
identification
place
on
the
back
panel
shows
for
which
power
source the
unit
is
wired.
See
Section 5-5
for
information
on
changing
taps.
Connect a
suitable
50
ohm
RF
load
to
RF
OUT
jack Jl using a type N connector
and
RG-8/U
or equivalent cable.
tonnect
Mono
audio .
line
to
TBJ
and/or Stereo
Generator ·:to
COMP
jack J2. Connect
SCA
Generator
to
either
SCA
jack J3
or
J4.
Connect
AC
power
plug
to
·approp~iate
power
source.
C A U T I O N
When
connecting the Exciter to the Transmitter, tuning
of
the
transmitter
input
circuitry
will
be
facilitated
by
the use
of
a
3dB
30
watt
pad
and
a
thru-line
wattmeter
between
the Exciter
and
-the Transmi~ter.
If
these-devices are not a-
vailable
reduce the output
power
of
the
exciter
and
tune the input
of
the
trans-
mitter
until
a
somewhat
reasonable
match
is
obtained.
If
the
transmitter
is
al-
ready tuned to
exciter
frequency a
11
touch
up
11
adjustment should
b{
all
that
is
necessary.
If
the
IPA
of
the
transmitter
can
be
mistuned to the point
of
os-
cillation
be
sure to use the
3dB
pad.
It
is
possible to drive
large
amounts
of
power
back
into
the Exciter
from
an
oscillating
IPA
thereby destroying the out-
put
transistor.
-6-