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"KL7JR Sloping Vertical
Delta Loop 80-6 Meters"
Imagine 9 bands on one wire
antenna!
(Updated August 1,
2014
I like loops. I'm amazed at how a "shorted-out
antenna" can even work at all more or less so well! My favorite vertical
loop for portable and fixed use is described below. (Ref. 1).
I had great results with it from Alaska and the Yukon on
my portable outings! It is extremely easy to build and only requires 136
feet of wire and a tuner. No balun or choke coils necessary.
This design simplifies another design I've had
good results with over the years (Ref. 2). I
wanted to place the feed point at the apex and eliminate the balun. If you
can get the apex up about 60 feet you'll have a more perfectly shaped
delta loop, but if you can't, (not every ham has a tall tower!), don't
worry as the loop will work great sloped or off shaped a bit as
well.
Getting mine up 20 feet above my motor home roof (30
feet high total) on a simple mast is what I do. Then I just pull the
bottom legs out a bit and tie off to "something" at least 8 feet (for
safety) off the ground.
Remember, this loop is above a
motor home!
Given halfway decent propagation, this antenna should
work a lot of DX in all directions as the other designs have for me. Check
out the map below to see what it has done for me so
far!
1005 divided by 7.2 MHz =140 feet. KI8GX, (Ref 1.
below), found that 136 feet long worked for him, so that is the magic
number I will also use to maintain 1 WL on 40 meters which would also
allow 80 meter use. So I divided that 136 feet by 3 and rounded the sides
to about 45 feet per side. You can use more or less to suit your
tuner.
Here's how the loop stacks
up:
6M. 7 WL
10M. 4 WL
12M. 3 1/2 WL
15M. 3 WL
17M. 2 1/2 WL
20M. 2 WL
30M. 1 1/2 WL
40M. 1 WL
80M.
1/2WL
If your having trouble reading the info on
the bottom section of the map, it
says:
ANT: 150 FT Long Vertical Sloping Loop
(somewhat square), 1WL on 40m.
Orientation: East/West with top feed @ 20
FT above motor home roof.
Apex @ 30ft and legs
@10ft.
All stations worked on 14Mhz except the
KL7'S were on 7Mhz.
Worked about 30 states as well....band
conditions in and out all
day!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
FEEDBACK FROM OTHER BUILDERS!
August 1, 2014
This
from Paul - KB4GYT
Hi John,
I just wanted to let you
know that I built the KL7JR Sloping Vertical Delta Loop and I am having a
great time with it.
When I first built it, I fed it from the
top (apex about 50 feet or so). After a week I decided to feed it from the
corner.
I have used it on most bands but my favorite is
20m.
I am primarily a cw op but I do get on phone as
well.
I built the antenna out of solid 14 gauge copper wire
- all I had in the garage at the time of the build!
All
stuff to build it was on hand-no cost!
Here is a sample of stuff worked with the K3 and 75w:
PY2 15m cw
OH3 40m cw
4K9 20m cw
RA4 20m cw
ZP6 20m cw
9K2 20m cw
E7 15m cw
KH6 20m RTTY
VK2 30m
cw
4X4 20m cw
TF3 20m cw
KH2 20m
cw
JM7 20m cw
A92 20m SSB
5T0
20m cw worked tonight
I am currently
listening to A92HK on the loop. He is peaking S8 and was louder the other
night.
It is amazing how much louder some stations are on
the loop as compared to the Carolina Windom.
WOW! And all since July 12th, 2014
Thanks for the idea - my first loop since I got my license in
1983...I am sold!
I have been telling other ops about how
easy it is to build and how well it performs.
73, Paul KB4GYT in South Carolina
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