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THE KL7JR 5 BAND PIPE VERTICAL
1/2 Wave on 20 Meters
by John Reisenauer, Jr., KL7JR
A simple, cheap and easy to build 33 feet long vertical antenna
that works DX on 20 - 10 meters including WARC BANDS.
That's 20,
17, 15, 12 and 10 meters!
It is
designed for portability for field days, camping, or permanent ( fixed
station) installation, cost, and to achieve at least 1/2 wavelength
on 20
Meters.
You will not
believe it's performance until you try
it!
Material List:
1 ea 10 foot 1 inch EMT conduit
1 ea 10 foot
3/4 inch EMT conduit
1 ea 10 foot
1/2 inch EMT conduit
1 ea 102 inch
CB whip
3 each hose
clamps
Assorted
bolts, nuts from junk box
Insulating
support for base of antenna (3 inch)
Assorted # 12
wire or plumbers tape for radial ring
4 to 6 or
more radials + - 16 feet long from wire for each
radial
NOTES and
BUILDING TIPS: (See drawing above)
Slide 1/2 inch EMT pipe into 3/4
inch EMT pipe 18 inches
Slide 1 inch pipe 24 inches OVER
end of 3/4 inch pipe and bolt or pin 2 places
Drill and bolt or pin above
sections together. (Assure that you have good electrical and mechanical
connections between all sections)
Hose clamp the CB whip on the
outside surface of the 1/2 inch EMT section assuring that it
overlaps 6 inches with the 1/2 EMT for a total length of all 3
sections of 33 feet top to bottom
Use some form of insulator on the
base (1 inch section) to isolate the antenna from
ground.
Build your ground and radial ring
from about 12 inches of wire and lay around the base of the
antenna.
Atttach the radials, as many as
you can lay out.
Attach the center conductor of
your coax to the base of the antenna and the shield to the ground ring
where radials are attached.
Raise antenna (See Antenna
Raiser Project) and support....you may need to guy it with rope if
windy.
More Projects from John:
Antenna
Raiser
Drive on or
Permanent Vertical Antenna base support
5 Band Vertical
with minimum 1/2 wave on WARC bands!
