Antenna Projects by N2KBK
Here you will find 2 simple antenna projects for 6 meter fun designed for easy and inexpensive construction.
The first project is a 3 element 6
A 3 ELEMENT BEAM
Director-------------106 and 1/2 inches
Spacing between elements is 34 and 1/2 inches. The elements are 1/2
inch aluminum tubing of 1/16-inch wall thickness. (you can cut up an
old TV antenna, they work great).
GAMMA MOUNT BRACKET ASSEMBLY
Now you will need to get some more sheet metal to build the SHORTENING strap of the gamma this may vary in size depending on the tubing size and the space from driven to the gamma match. The gamma match is mounted along the side of the driven after you have soldered the innner conductor of the gamma to the center od the SO-239.
See drawing below for typical gamma match placement and construction.
The spacing of the gamma match is usally about 1.5 to 2 inches from the driven element (Does not make much difference). To make the SHORTENING strap make a 1 inch strip about 6 inches long.
Take this strip and bend it around the driven and over to the gamma. Make sure it folds back over so that you can drill 1 hole at each end. You can use your own construction methods and fabrication.
A GAMMA MATCH
The gamma match is made from 3/8 inch tubing.
The inner portion is cut from RG-8 coax after you remove the black 'skin' and the copper braid. You can attach 50 ohm coax to this antenna after you add a gamma match.
Once you have this antenna put all together you can adjust the match by sliding the shortening strap and the gamma tube in and out (or up and down however you look at it) for lowest S.W.R.
A 6 METER
The 6 meter Halo is
a good antenna that can be used for the car as well as the
The 2 large discs can be
about 4-5 inches round and the small disc about 1.5 inches. Mount the 2
larger discs at the ends of the halo by screwing end caps to the center of
them and then the end caps will go over the ends of the halo.
To match the antenna simply move
the gamma around a few times (move it in small increments is really
tough). Once you get the S.W.R. down below 3:1 then move the small
disc by loosening the nut and turning the small disc.
Many thanks to the late Robert
Cook, WB2OHP for the endless hours of advice, help and lots of radio
Due to the infinite wisdom
of AOL.com, many if not all of the personal websites that were hosted by
them were shutdown permanently with little or no warning!
We are happy to
maintain his projects on Hamuniverse.com.