|BACKYARD....CITY LOT ANTENNAs I have tried and worked on....ideas for you. (page 3 ) June 9-2011
Back in 1973, I was VE3ECJ and I operated a station at my parents house in Westboro. That
is a part of west end Ottawa. My father worked for a lumber yard and brought me a three
western Cedar 2X3s 20 ft long each. I made a mast about 35 ft high and it was foldover and
guyed to the side of our back porch.
The dipole was made from 2 - 8 ft lengths of aluminum tubing and the standoff insulators
were wooden broom stick handles with bolts and glue to hold them together. No balun at
the feedpoint or choke of any kind. Using my Ten Tec 505 Argonaut on ssb mostly and bare
foot with about only 2 watts I had a ball working stations sporatic E.
The antenna worked really well. Dipoles up high in the clear..with a wooden mast work well.
I later built a quad out of lumber and it worked really well. It was too heavy though and I
took it down. It was only up about 24 ft off the ground on this wooden mast I made.
The wooden mast was not an A frame type. The 2 by 3 lumber was just used straight up and
down and bolted together. I could hinge down the upper 2 by 3 for antenna work if I
needed to and I would stand on the back porch roof which was flat.
An Antenna I have a notion to make up for this years field day..
(June 25 and 26th) 2011 is the two band version of a ten meter
As per sketch above that I seen one time on the web,
Apparently the RM10 low power hustler mobile coil(s) can act
sufficiently as a choke for 6 meter energy and at the same time
act as a loading coil for 10 meters.
Thus a 2 band compact dipole can be formed. I happen to have
a pair of RM10 mobile coils in my junk box..so..I may just cobble
up a 6 and 10 meter portable dipole.
IN FACT..NOW THAT I HAVE BEEN THINKING OF IT...FOR A BIT
NOW..I THINK I WILL GO DOWN THE BASEMENT NOW..TO MY
SHACK AND DIG OUT THESE COILS AND TRY AND FIND SUITABLE
LENGTHS OF ALUMINUM TUBING AND WILL TRY AND COBBLE
SOMETHING UP IN THE NEXT DAY OR TWO.
THE RESULTS AND A FEW PHOTOS WILL BE POSTED ON THIS
HERE PAGE SOON!!! STAY TUNED!
The CB whips experiment. I tried to make a 10 meter and 6
meter short loaded dipole from two "trucker" style CB
I didn't get it going quite right..but I though you might be
interested. If you are a tinkerer and experimenter and want
to try to get it going..Here is some results I had. ---->> I was
going to mount this mini dipole up above my little mini
beam if I had of gotten it to work.
The LASH UP EXPERIMENT. Two CB whips mounted about 6 ft off the ground off my picnic table. NOTE: In the background..you can see the HF2V
vertical antenna lying down and out of the way. Normally...the 80/40 ground mounted vertical is mounted vertically and clamped to a bracket on
the 4 by 4 mast in the back yard. The upright structure supporting the two CB whips is another one of my experimental antennas. It is a quad
antenna for 2 meters that I was working on. I painted it with silver paint. The boom is wood and the spreaders fiberglass.
The 2 points of lowest SWR indicating resonance. The 27.172 is not surprising. It is about right for 2 cb antennas formed into a dipole. The 67.080 resonant
point is about what I expected. I knew that the helical top section of the cb whip was a tightly wound coil (choke like). I knew that there would likely be a
second resonant frequency as a result. I was hoping it would be closer to 50 mhz (the six meter band).
I started playing around with the coil at the top and adding a bit of wire at the tip ect..but I didnt have all that much time to fiddle with the antenna. Instead..I
have decided to try the hustler RM10 resonator with a 54 inch dipole to create a 2 band dipole for 28 and 50 mhz. I think it should work.
NOTE: for a yagi..that needs at least a reflector and a director..(perhaps) this CB whip dipole could be used somehow. It might work well as a reflector for a 28
mhz yagi and a director (of sorts) for a 50 mhz yagi.
This is something I might try this Field Day. Field Day is a fun activity and you can try out some antenna ideas and make alot of contacts with your antenna lash
up. If it works well..you can build a more permanent version later.
The R7 style vertical antenna I used Field Day 2005--- worked well on 20 meters. I might try it again some field day in the future. If you want to see more
concerning the R7 style vertical experiment..go to my Antenna Page (www.hamectronicsmagazine.com) and you can see some nice close up pictures.
The antenna was very broadbanded on 20 meters. It was a 20 meter monoband (almost 1/2 wave) vertical that I lashed up for Field Day. NOTE: all the reports
were 5 by 9!!!! I didnt have time to try the antenna under different circumstances.
|That's about it for now..June 9th 2011. I will be trying now to start building the rotatable
dipole for 6 and 10 using 2 short pieces of aluminum tubing and a couple of RM10 coils.
It will be a Field Day antenna if it works!!! I will be posting pictures and results..73 earl
HERE IS A LINK TO THE FREE ON LINE HAM RADIO MAGAZINE I AM WRITING.
click on this link to visit the home page www.hamelectronicmagazine.com
|OTHER LINKS OF GENERAL INTEREST..
my other web site I have also just started is:
|---- this is page 3 of a 3 page article on the subject of
small backyard style antennas.
to go to page one of this article CLICK HERE PAGE 1 of 3