Heathkit SW-7800 - Page 17

Heathkit
Page
105
EXTERNAL
POWER
SOURCE
Conne
pins
and
a
large
2-pin
plug
shell
are
pro:
vided
so
you
can
use
an
external
DC
power
source
such
as
a
battery)
to
power
your
Receiver.
The
power
source you
use
must
be
capable
of
supplying
1
15-volts
DC
at
3/4-ampere.
To
connect
your
Receiver
to
an
external
DC
power
source,
refer
to
Pictorial
9-4
and
perform
the
follow-
ing
steps:
(_)
Locate
the
large
2-pin
plug
shell
and
the
two
female
connector
pins
that
were
supplied
with
your
kit.
Then
cut
the
ears
from
the
connector
shell
as
shown
)
Prepare
a
red
wire
and
a
black
wire,
at
least
18
gauge
(not
supplied),
long
enough
to
reach
from
the
Receiver
to
your
power
source.
Re:
move
1/4”
of
insulation
from
one
end
of
each
wire
and
install
a
female
connector
pin
on
the
end
of
each
as
shown
(_}.
Position
the
2-pin
plug
shell
with
its
point
as
shown;
then
insert
the
pin
on
one
end
of
the
black
wire
into
the
hole
at
the pointed
end
The
pin
is
properly
seated
when
it
snaps
into
the
shell,
()
Similarly,
insert
the
pin
of
the
red
wire
into
the
other
hole.
RED
elk
PICTORIAL
9-4
avers
trainee
ai
ae
l
fur
(}
Loosely
twist
the
wires
to
form
a
2-conductor
cable. Then
remove
sufficient
insulation
from
the
end
of
each
wire
so
you
can
connect
your
power
source
to
this
end.
()
Connect
the
black
wire
to
the
ne
source
and
the
red
wire
to
the
positive
(
source,
CAUTION:
Before
you
connect
your
power
sourc
to
the
Receiver,
recheck
the
connections
to
be
sur
the
negative
(—)
source
is
connected
to the
pointed
end
of
the
connector
and
the
positive
(+)
sourc
to
the
flat
end.
Reversed
polarity
could
damage
your
Receiver
(_)
Plug
the
connector
into
the
EXT.
POWER
sock:
et
on
the
back
of
your
Receiver.
er
in a
boat
or
car
NOTE:
If
you
use
your
Re
keep
the
power
supply
leads
as
short
as
possible
to
help
reduce
ignition
noises.
You
may
need
to
in-
stall
a
“hash
filter”
if
the
interference
is severe.
The
ARRL
Handbook
contains
valuable information
about
noise
filtering,
This
completes
the
“Installation”
of
your
Receiver.
Proceed
to
“Operation.”
Positive
©
BATTERY