2 METER SQUARE LOOP
|ADJUSTING SCREWS FOR TWEAKING SWR|
are the building instructions on the 2 meter square
Credit is given to K0FF for most of this design.
We have added modifications that proved useful in the design.
The mods will be presented under modifications in the design instructions. Special thanks to W6ARQ and, KC5BBP for thier input on this Antenna.
2 Meter Square Dipole by K0FF
Here is the parts list and dim. sheet for the 2 meter square dipole, made of copper water pipe.
1/2 Inch Copper Water Pipe
Long 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
Brass Plate for SO239
Gamma Tube 4 3/4 of 3/8 Copper Tubing
RG8 is 5 1/2 iches long
Copper or Brass Gamma Tube Bracket
Modification Parts (DO NOT USE STAINLESS STEEL)
6 Brass Nuts-Note Any size
2 Brass Screws at least 1 1/2 long
Instructions The mounting array to be affixed to a standard mobile
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 swr.
Do not use Stainless Steel Screws, Soldering them to the end caps is almost impossible.
The 2 meter square loop is a folded Dipole around itself.
The shape is 11" X 11".
Solder the antenna parts together using 90 degree elbows at the corner open ends and mind the gap.
All 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 SO-239.
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 matter.
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
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 AO-27.
The Antenna provides excellant SSB results while mobile and have talked with other stations 200 miles with simularly equipped Antennas.
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!!!!
I have found this Antenna works very well and, is a solid performer.
Best of luck with your Antenna.
EXPERIMENT! EXPERIMENT! EXPERIMENT!
See the original design on eham.net
|VIEW FROM THE EARTH|
|2 METER SSB ANTENNA PROJECT|
|GAMMA MATCH CLOSEUP|