Heathkit SW-7800 - Installation

Page
102
INSTALLATION
To
obtain
satisfactory
shortwave
reception,
your
Re
ceiver
should
have
an
outside
antenna
connected
to
it.
(The
built-in,
telescoping
antenna
is
for
broad-
cast
reception
and
portable
operation).
Also,
a
good
ground
system
is
required
for
good
reception.
The
following
paragraphs
contain
information
about
sev-
eral
types
of
antennas.
Read
this
information
so
you
can
decide
which
type
of
antenna
best
suits
your
needs.
CAUTION:
Stay
away
from
power
lines when
you
install this,
or
any,
antenna.
Make
sure
the
antenna
cannot
come
into
contact
with
power
lines.
‘The
following
information
includes
three
types
of
antennas:
random
length
wire,
dipole,
and
inverted-
V
dipole
antennas.
Read
the
information
concerning
each
antenna
and
then,
after
you
have
decided
which
one
would
be
most
suitable
for
you,
build
and
install
the
appropriate
antenna.
Random
Length
Wire
—
You
can
use
a
random
length
of
wire
for
the
antenna
with
a
single
wire
lead-in
coming
from
one
end.
If
you
have
no
favorite
band,
install
as
long
an
antenna
as
your
facilities
permit.
Dipole
~
This
is
a
directional
antenna
designed
for
optimized
shortwave
reception.
Since
this
type
of
antenna
is
directional,
signals
are
received
best
when
the
antenna
is
turned
broadside
to
the
trans-
mitting
station
(that
is,
when
the
ends
of
the
antenna
do
NOT
point
toward
the
transmitting
station).
NOTE:
This
antenna
is
most
effective
over
a
narrow
frequency
range
(about
2
MHz.
wide)
Inverted-V
Dipole
~
This
is
a
nondirectional
antes
designed
for
optimized
shortwave
reception.
Tj
nondirectional
feature
allows
this
antenna
to
rect
signals
equally
well from
all
directions.
Therela
it
is
often
possible
to
receive
more
stations
witht
antenna
than
you
would
with
the
straight
dipole
tenna,
NOTE:
Like
the
straight
dipole
antenna,
i
antenna
is
most
effective
over
a
narrow
frequen
range
(about
2
MHz)
The
following
sections
show
you
how
to
const
the
antennas
described
above.
Random
Length
Wire
You
will
need
the
following
parts
to
install
a
randa
length
wire
antenna.
Similar
parts
are
required
construct
one
of
the
dipole
antennas.
Antenna
—
A
length
of
bare
antenna
wire,
Lead-in
—
A
length
of
insulated
wire
length
depends
upon
the
height
of
your
#
tenna
and
the
location
of
your
Receiver.
Ground
wire
~
Same
type
as
the
antenna
wi
‘The
length
depends
upon
the
distance
betwe
your
Receiver
and
the
grounding
surface.
Insulators
~
Three
ceramic
or
glass
type.
proximately
2-1/2
inches
long.