Ham Radio News!
Ham Radio Videos!
HF & Shortwave
RFI Tips and
Support The Site
Vhf and Up
6 METER 6
ELEMENT SSB YAGI PLANS
FOR 6 METER SIDEBAND
Yagi Antenna Design program by WA7RAI called Quick Yagi
This 6 meter 6 element SSB yagi was designed and
optimized for best feed match using 50.125MHz as the center frequency
which is in the SSB portion of the 6 meter band. The older "Quick
Yagi" program was used in its design.direct feed
element insulated from the boom.
According to the program,
it has a gain of 11.06dBi with a front to back (F/B) ratio of 30.12dB
on a boom length of 17 3/4 feet with 1/2 inch elements
using a standard
The QY4 design program indicated that
the VSWR is flat at the design frequency of 50.125 (1:1), and at 49.49mhz,
1.47 : 1 and 2.22 : 1 at 50.752mhz.
It should be noted that the numbers
quoted above came from within the perfect world of the computer program
and not from the real world that an antenna exists
No matching device should be required as it was
designed to be direct fed with 50 ohm coax, but due to variations in
your construction practices, some adjustment of the driven element
may be needed or us a gamma match with non-split (not insulated from boom)
solid dipole driven element and tune for best SWR.
When checking SWR,
place antenna with reflector on the ground and prop yagi straight up at a
ninety degree angle to earth....use low power to check SRW.....adjust
match or length of driven element as required and recheck.
Repeat procedure until lowest SWR is obtained and mount yagi on your mast,
pole, tower, etc in a horizontal position relative to the ground
for 6 meter SSB operation.
The SWR in the final operating
position may vary slightly but not enough to worry about.
measurements on the picture below may be very hard to obtain perfectly,
but don't worry too much about them! Try to get them as close as possible
using whatever construction practices and genius you can find. Round them
off to next highest or lowest number and forget about
9.77 feet = 9 feet 9 1/4
9.53 feet = 9 feet 6 3/10
9.16 feet = 9 feet 1 9/10
8.77 feet = 8 feet 9 1/4
8.85 feet = 8 feet 10 1/5
8.38 feet = 8 feet 4 1/2
3.38 feet = 3 feet 4 1/2
2.36 feet = 2 feet 4 3/10
4.10 feet = 4 feet 1 1/5
3.46 feet = 3 feet 5 1/2
4.42 feet = 4 feet 5
Total boom length = 17 3/4 feet (1 inch
(Refer to Drawing Above)
Get your lengths as close as
best......... but hard to get in the homebrew
The driven element (dipole)
shown in the inset in the drawing is insulated from the boom which is
metal, by the homemade non-conducting bracket which you must fabricate.
Heavy Plexiglass works fine as long as it is thick enough to support the
driven elements (one on each side). Other materials may be used to
construct the insulator as long as they insulate both halfs of the dirven
element from the boom.
The two halves of the total driven element
length can be attached to the insulator using muffler type clamps, u
bolts, several large wire ties or what ever your gray matter can come up
with as long as the elements can not move by outside forces and do not
touch the boom after final installation.
The other elements of the
antenna should be installed thru the boom but if this is not possible for
you, just mount them at the required spacing using your genius. The final
pattern may be slightly off center from the boom by a degree or two but us
The idea is to have FUN and experiment!
from the feedline (50 ohm coax) are attached as you would any dipole.
Center to one side, shield to the other using whatever arrangement of nuts
and bolts you may have. Seal all connections, coax end and antenna
elements from mother nature!
If you decide to use a gamma match instead
of this type of mounting arrangement for the dipole, you won't have to
worry about the mounting bracket for the dipole but then you will have to
decide on a way to mount the gamma match.
You can design your own gamma
match for this antenna by using a separate program that comes with the
Quick Yagi antenna design software. Get the
free complete download
here! Note!!!!This is a zip file! "Quick Yagi"
will only operate on Windows XP or some earlier versions of windows.
Download and unzip the program into a folder of your choice if using
Windows XP or earlier versions then unzip it and use "Set Up" file to get
started. You can try it on other versions later than XP but it may
not work! Make sure you read the help files and documentation within
project was designed to give you a starting point in getting on the air
on 6 meter SSB fun with a respectible signal using just a stock radio
and it should increase your effective radiated power near 9 times (plus or
minus a few % for construction
It is also a good idea to use an
"Ugly Balun" or other 1:1 balun capable of 6 meter operation near
the feed point to help eliminate rf on the outside of the
This editor once built a 6 element yagi for the
middle of the 2 meter band using discarded aluminum sections for the
elements that were "U" shaped from old junk flouresant light fixtures and
attached them to a 1 inch square boom, 16 inches apart for each and the
standard dipole formula 468/freqmhz was used for the driven element fed
with a homebrew gamma match. 5% was added for the reflector length and
each director was shortened 5% shorter each, progressing to the end of the
SWR was checked as above and was less than 2 to1 to start but was
lowered a bit, down to about 1.5 to 1 and put up on a 16 foot mast with
rotor and it worked
Scan Police, Fire, Rescue,
Ham Radio, Aircraft, Ships, and much
Hamuniverse.com uses Green Geeks Web