Then Tighten - LDG Electronics

Then Tighten - LDG Electronics
FREE DIPOLE ANTENNA KIT
LDG ELECTRONICS DIPOLE KIT
Congratulations on selecting the LDG
Electronics Dipole Kit! This simple kit may be
constructed into an antenna for single band use on
any of the 20 meter thru 6 meter bands without a
tuner, or for multi-band use with a tuner.
KIT CONTENTS:
• This instruction sheet
• 3 “egg” insulators
• 35 feet of 14/7 stranded copper wire
TOOLS REQUIRED
To construct the dipole, the following tools and
additional supplies are required:
• Wire cutters
• Soldering iron
• Solder
• Electrical tape / sealant
• Coaxial cable or ladder line
• PL-259 or other suitable connectors
• Plastic wire ties (“zip ties”)
• Rope / Pulleys for hanging antenna
• (Optional) Drill and drill bit
• (Opt.) SO-239, screw, nut, and ring terminal
DIPOLE THEORY
A half-wave dipole, otherwise known as a
center-fed Zepp, consists of two equal length
quarter-wave wire segments fed at the center. The
overall length, in feet, of a half-wave dipole is given
by:
Overall Length
Transceiver
5 0- oh m C o a x
DIPOLE CONSTRUCTION
Dipole construction begins with selecting the
operating band from the chart at the lower right of
this page. Cut two legs from the supplied copper
wire, adding about one extra foot of wire on each
leg, to allow for wrapping the wire around the egg
insulators.
Wrap one end of each leg on an egg insulator,
as shown below. Don’t solder this connection just
yet; you may need to adjust for overall length.
Preparation of the center insulator depends
upon whether coaxial cable or ladder line is used.
(continued next page)
Wrap wire like this
Then Tighten
Solder (after adjusting length)
468
Length =
f (MHz)
!
ASSEMBLY MANUAL REV A
Antenna
Tuner
Band
Freq
MHz
Overall
Length
Leg
Length
6m
52
9’ 0”
4’ 5”
6m
50
9’ 4”
4’ 7”
10m
29
16’ 2”
8’ 1”
10m
28.1
16’ 8”
8’ 4”
12m
24.9
18’ 10”
9’ 5”
15m
21.2
22’ 1”
11’ 0.5”
17m
18.1
25’ 10”
12’ 11”
20m
14.25
32’ 10”
16’ 5”
20m
14.07
33’ 3”
16’ 7”
PAGE 1
FREE DIPOLE ANTENNA KIT
If small coaxial cable is used, dress the coax as
shown. Loop the coax around the center insulator,
and use a zip tie or electrical tape to secure the coax
mechanically.
ASSEMBLY MANUAL REV A
If ladder or window line is used, use a short
loop of rope or twine to suspend the ladder line
from the center insulator as shown:
pe Suppo
rt
Ro
Ce
ai d
n te
Br
r
Zip Tie
Ladder Line
Coax Attachment
For larger diameter coax, it’s better to drill two
holes in the center insulator; one to hang the
insulator with rope, and the other to support a loop
of rope that supports an SO-239 connector.
Drill hole
to hang SO-239
Drill hole for
rope hanger
Alternate Center
Insulator Hanging
A WORD ABOUT BALUNS
Coaxial cable is unbalanced. Taping a few
ferrite beads in place over the coax near the antenna
will improve performance. Also, a balun should be
used to connect any LDG tuner to ladder or
window line.
INSTALLATION
The dipole will perform well as a flat-top,
inverted-Vee, or sloper. Use non-conductive rope to
support all three insulators. Check for low SWR,
and adjust the length if necessary. Once the length
is set, solder all connections and seal with tape or
sealant. You’re on the air!
The completed SO-239 application looks like
the photograph to the right. A ring terminal is used
to connect to GND, and the center connection is
soldered to the solder cup terminal. Make certain
that the loop of rope supporting the SO-239 is
short enough so that the rope is supporting the
connector, not the wires, to avoid wire strain.
DANGER: Never install antennas near
overhead power lines. Serious injury or
death may result!
PAGE 2
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