ADJUSTING SCREWS FOR
parts and assembled
CAN BE FOUND ON THE 146.67MHZ
AREA MACHINE MUMBLING SOMETHING ABOUT GRID SQUARES
AND DX IN
THEIR SPARE TIME! EMAIL THEM FOR ?????
AF4AR USES THIS ANTENNA MOBILE ON AN 18
Here are the building
instructions on the 2 meter square loop.
Credit is given to K0FF for
most of this design.
We have added modifications that proved useful in the
mods will be presented under modifications in the design instructions.
Special thanks to W6ARQ and, KC5BBP for thier input on this
2 Meter Square Dipole by
Here is the
parts list and dim. sheet for the 2 meter square dipole, made of copper
1/2 Inch Copper Water Pipe
Sides 9 1/2 inches
Open Ends 3 1/4
2 Short Pieces on each side of
"T" 4 7/16
4-90 Degree Elbows
1 Copper Tee
Plate for SO239
Gamma Tube 4 3/4 of 3/8 Copper Tubing
RG8 is 5 1/2
Copper or Brass Gamma Tube
Modification Parts (DO NOT USE STAINLESS
Nuts-Note Any size
2 Brass Screws at least 1 1/2"
Instructions: The mounting array to be affixed to a standard
mast that presents 3/8 X 24 threads.
Run coaxial cable right
to the antenna and connect it to the built in SO-239.
Their are two
adjusments on the Antenna to match the coax Imp.
Adjust the Gamma Match
Tube for Lowest SWR, then the tuneable stubs move in or out for lower
Do not use Stainless Steel Screws, Soldering them to the end caps
is almost impossible.
The 2 meter square loop is a folded Dipole
The shape is 11" X
Solder the antenna parts together
using 90 degree elbows at the corner open ends and mind the gap.
measurements are critical. The brass plate to hold them form an "L" 1-3/4"
tall with a 1/2" lip.
A 5/8" hole is provided 1-1/4 inch from the bend,
and attached using stainless steel or brass hardware.
Two small holes
are drilled in the lip and mounted to the copper TEE with #6
self taping screws.
Solder the 5 1/2 inch piece of RG8 to the
When using the RG8 discard the outer shield and use only the
Dielectric. Slip the RG8 inside the 4-3/4 Gamma Tube.
The Gamma bracket
should be at least 1 1/2" long brass or copper.
Secure with stainless
steel screws right before the 90 degree elbow.
Either side doesn't
The Gap between the Open Ends is 2-3/8".
Adjustments to the
gap in or out can be made with the modification
of installing the brass
screws on the end caps.
The Antenna is more or less Omni
Directional and horizontally polarized.
It presents a high takeoff
angle and is intended for use in the 144.200mhz area.
The Antenna can
handle 100 Watts and has proved useful in working some satellites such as
The Antenna provides excellant SSB results while mobile and have
talked with other stations 200 miles with simularly equipped
For further Information on assembly or
instruction details Email
the following hams below.
Kc5bbp lives too far back in the
hills of Tennessee to get daylight...much less email!!!!
PLEASE DON'T EMAIL HAM UNIVERSE.COM FOR
QUESTIONS PERTAINING TO THIS ANTENNA..GO TO THE EXPERTS
found this Antenna works very well and, is a solid performer.
luck with your Antenna.
See the original
design on eham.net
(from an article by
KOFF on EHAM.NET )
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