|BACKYARD....CITY LOT ANTENNAs I have tried and worked on....ideas for you. (page 2 ) June 5-2011
|Below pictures of the HF2V (Butternut/Bencher) 80/40 vertical. I put this antenna up about 3 years ago now. Today..I checked the resonant spot. It is
actually 1 to 1 swr up around 3890 mhz and up at the very high end of 40 meters near 7.3 mhz...>>> this is actually a good thing. It tunes easily with
my LDG auto tuner in the shack....HOWEVER..I'm thinking of putting a remote tuning coil at the base to lower the resonant point. Either that..or I will
add a top hat near the top of the upper coil and I may rotate the top hat with a tv rotor and make the top hat some sort of very different physical
layout that can actually tune the vertical resonant point from the low end of the CW portion up to at least 3.850 mhz. I dont operate above that point
and I mainly operate CW at the low end near the QRP frequencies on cw.
My backyard and whole yard is a fairly good sized city lot..but I have a
garden area and 2 sheds for my ATV/boats ect and so I put in a counter-
poise ground consisting of 12 foot long copper pipes.
It does work reasonably well. At times my yard gets quite wet with
drainage off the neighbours lot. I can live with this small buried counter
poise. To see more pictures go to my start page and look up the entire
article concerning the HF2v and the ground system ect.
I used a torch to solder the copper pipe and to solder
interconnecting copper wire to the adjoining pipes.
It is a bit like a copper web. It works. I think it works
quite well actually.
I have no other antennas to compare it with on 80 and
That may change in the future and I can then do some
The main thing is..it has a low profile. No wires running
overhead. I don't like overhead wires.
It can be easily taken down.
I can take the HF2V away entirely and try another
antenna out in its place.
In fact..I have an MFJ 3 ft dia loop for 10 mhz through
28 mhz which I may mount over this radial patch and
on the 4 by 4 mast. This is my own little antenna range!
The two opposite ends of the antenna.
The blue insulator is from an old
commercial vertical antenna and so is the
I actually broke the base insulator in
winter. The ice had covered the base of
the antenna and when I tried to fold down
the antenna I used too much force and
broke the base insulator.
At the top of the vertical..I added a low
profile RM15 hustler mobile coil. The HF2V
has some top loading as well as the lower
The lower coils were moved up the
vertical and larger diameter aluminum was
bought and used to beef up the vertical
so it doesnt flop around in the wind so
|Coils in antennas to get multiple resonant points..some experiments I have tried or am considering trying
or may work on again in future!!!
Here is the idea of using a coil to load the dipole (or vertical)
element for one band..AND..for a second band of operation..the coil
could be a large enough inductance to act as a CHOKE rather than a
trap and divorce the first part of the antenna. This goes back to at
least 1961April QST and I dont think it was the April Fools article
A commercial antenna that uses this principal is the Alpha Delta twin
Shown on the picnic table are the 4 end coils and capacitance hats
from the TGM hybrid mini antenna I was putting up and together a
few years back.
The TGM antenna resonates on 20, 15, 10 and 6 and even 2 meters
in some cases.
In one of the earlier antenna compendums..I think it was the second
one..a fellow created the swallow tail antenna. It is a remotely tuned
version with a pull cord to move the end tail of the two band
antenna so that it resonates across the whole 80 meter band.
End loading is supposed to be the most efficient way to load an
antenna. My HF2v has a small amount of top loading that I
introduced to its design with a modification of my own.
>>>>.link if needed back to index page..start page of the on line FREE ham radio
thanks for reading..73..much more to come folks as I start writing again..earl ve3ab
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In trying to create a tilt over feature for the vertical I did quite a bit of work on the old railway
rail piece and old vertical antenna base section. It worked until I broke the hard plastic blue
base insultor. I forced it too much when stuck in some ground ice and broke it.
I sunk as much copper into the ground counterpoise area as possible and joined and lashed
the tubes and wires together..soldering with a torch.
I do have a few ground radials as well.
Here is a commercial antenna coils from the Alpha
Delta twin sloper antenna. With this inexpensive
inductance meter I measured 96 microhenries.
Anwhere from 100 to 120 microhenries (according
to the Lattin qst article) is enough to act as a
choke isolater for a 40 meter dipole.
In the case of the Alpha Delta Twin sloper...there is
a tag end of somewhere around 20 ft roughly
which resonates the 40 and 160 meter half sloper
leg of the antenna.
The ""twin"" sloper has another (second) leg
which should run 180 degrees away from the
tower and the 40/160 leg.
It is a full size 80 meter quarter wave sloper.
I had some good reports on 160 with qrp (using my
index labs qrp rig) on 160 and as I recall..the swr
curve was fairly broad on 160. I was right near a
lake with a large tv antenna at the top of a 45 ft
Another idea I had was to use
this 4 by 4 inch galvanized
construction fitting to cobble
up some sort of tilt over
mechanism for my vertical.
It didnt work out. I went with the
railway rail piece and the blue
plastic base insulator from an
old commercial vertical.
It worked alright until our
northern winters came around
and I broke the insulator in the
cold and ice. A better idea
would be a fold over
arrangement like the one DX
Engineering sells. I may end up
making one myself. See pic.
DX Engineering in USA looks like a
good outfit to buy aluminum tubing
and a folt over mast. They also sell
insulators and boom to mast
mounts and clamps ect.
This HF2V of mine has new larger
diameter tubing at the base and
the smaller diameters were moved
up towards the upper part of the
antenna. It does not flop around as
much in the wind as the original
This arrangement with a chunk of railway rail worked until I
broke it! I guess I don't know my own strength!! I tried using
crazy glue to bond the insulator but that didnt work. I might
try a product MIGHTY PUTTY.
Either that or I might buy some sort of really strong epoxy
mix and sink some screws into the 2 broken insulator pieces
and try that. Any suggestions? email@example.com (email)
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