Heathkit SW-7800 - Page 16

Page
104
Heathkit
Dipole
or
Inverted-V
Dipole
‘An
antenna
100
feet
long
will
provide
good
recep-
tion
from
3
to
15
MHz,
and
provides
the
best
recep-
tion
near
5
MHz.
Use
the
following
formula to
com-
pute
the length
of
an
antenna
that
will
have
its
best
reception
at
a
particular
frequency
468
length
(feet)
=
eqseney
(MH
‘We
suggest
that
you
refer
to an
ARRL*
Handbook
or an
Antenna
Handbook
for
further
information
on
these
types
of
antennas.
‘To
install
a
dipole
antenna;
locate
two
supports
that
are
fairly high
off
the
ground
and
50-100
feet
apart.
One
support
could
be
your
house
and
the
other
a
pole.
Pictorial
9-2
shows
you
how
a
dipole
antenna
can
be
supported
between
the
two
supports.
Detail
9-2A
shows
you
how
to
wire
the
center
insulator.
1)
tysueaton
thee
INSULATOR
INSULATOR
S
-—
support
}
suPPORT
|
|
Leap-in
I
\(coaxial
CABLED
PICTORIAL
9-2
SOLDER
ANTENNA
WIRE
CENTER
LEAD
The
center
support
for
an
inverted-V
dipole
antenné
should
be 20-100
feet
from
the
ground
and
both
end
supports
at
least
10
feet
from
the
ground.
Note
thél
the
angle
between
the
center support
and
the
antenna
wires
should
be
greater
than
45 degrees
Pictorial
9-3
shows
you
how
you
can
suspend
an
inverted-V
dipole
antenna
between
the
three
sup-
ports
INSULATOR
INSULATOR
s
INSULATOR
lions
eh
B
\
be
oven
over
|
ceao-in|
(COAXIAL
CABLE)
’
PICTORIAL
9-3
Install
a
PL-259
coaxial plug
(not
supplied)
on
the
free
end
of
the
lead-in.
Then
connect
the
coaxial
plug
to
the
antenna
socket
(50
{2
ANT)
on
the
reat
panel
of
your
Receiver.
SOLDER
ANTENNA
WIRE
A
FEW
TURNS
OF
WIRE
TO
HOLD
CABLE
TO
INSULATOR
Detail
9-24
+
american
Radio Relay
League,
Newington,
Conn.
06111