W6ZO Portable Delta Loop from the HFpack shootout
for details from the shootout!
Here are the instructions for Don's Delta
Loop, exerts are from email exchanges that Don and I had.
NOTE: PLEASE DO NOT email Don regarding the design of this antenna as he runs his own business and is extremely busy! Feel free to email me, firstname.lastname@example.org and I will try to answer any questions you may have.
(I hope to clean this up with Don's help, this
is a quick and dirty setup for now.)
The antenna is a full wave delta loop for 20 meters supported by 2 - 16.5' (21'
in the original design) "Crappie"
fishing rods from http://www.cabelas.com
(part number CCT-165) that are slid over a 90 degree
"horn" of 3/4" PVC pipe made from 2 - 45 deg elbows, a Tee and some pipe and
a flange - see figure a.
The antenna is fed with a 4:1 balun and a Z-11 tuner for 10 - 40 meter operation
(I have a
way of opening the loop in the middle of the top for better operation on 40).
(The antenna resonates beautifully without a
tuner on 20 meters, with the current configuration.)
Here are the required parts you will need
from Home Depot plumbing department and they should
understand the specifications of the parts if you don't as they are the proper
1 - 3/4 Galvanized floor flange
1 - 3/4 x 1 1/2" PVC Threaded nipple
1 - 3/4" S x S x T PVC Tee
2 - 3/4" PVC 45 degree elbows
10' - 3/4" PVC Schedule 40 Pipe (roughly $2.00)
Quick Clamps for attachment to table
A 3/4" Galvanized floor flange is clamped to the table - I use Quick Clamps
(woodworking clamps in tool dept). Into the flange is screwed a 3/4" x 1 -
1/2" PVC Pipe nipple. Onto the pipe nipple is screwed a 3/4" PVC Tee that is
Slip x Slip x Thread (glue on the run of the T and thread on the branch). 2
short pieces (about 1") of 3/4" Schd 40 PVC pipe attach 2 3/4" 45 degree
elbows to the sides (run) of the T - these are glued. Two 3/4" Schd 40 pipe
stubs (the remainder of the pipe cut into to equal pieces) are inserted (NOT
Glued so it can come apart) into the other side of the 45 deg. elbows. The
assembly looks like the horns of a bull.
You then cut 2, 4' sections of the 3/4" pvc
and insert them into the 45 degree ends.
DO NOT GLUE THE 4' SECTIONS TO THE 45 DEGREE
(this gives you the extra footage needed for
the full 70' of wire that this antenna requires).
Next the caps are removed from the bottom of
the rods and slide them OVER the 4' pipe stubs.
For the "switch - Don used a short (about 2" long)
insulator of 1/4" diameter fiberglass rod with a hole in each end. He ran the
wire through, and on one side left a pigtail that he attached a
mini-alligator clip to. For 10 - 20, he just shorted out the insulator, and on
he clips it back on itself. Made some difference - you might try one with and
one without. For wire, Don used #26 VariFlex Insulated as on
http://www.radioworks.com/cwire.html strong, small and light weight.
I chose to visit the local Radio Shack and
pick up a spool of #26 magnet wire.
(cost is around $4.00 for a spool of 3
The thing I like about it is it is self supporting and can be clamped to a
picnic table and still perform quite well.
You simply run the cable through the tips of the fishing rod and it is fed at
the bottom of the V to a 4:1 balun.
Please see pictures below:
Here are the parts on the card table unassembled.
Here is the front view of the finished product. (takes me roughly 5 minutes
Here is where it resonates on the LOW side (without tuner)
Here is where it resonates on the HIGH side.
Here is where it is dead flat! (this is 1 fat antenna!)
Here are some more far shots with the antenna assembled.
The antenna wire is so thin you cannot see it in this picture.
How does this work you may be asking?
Here are the first contacts I made with this antenna:
All contacts were on the Yaesu ft-817 and 5 watts, no tuner!
KE4NJP Rock Hills, SC he gave me 10 over 9!
WZ9S Pleasant Prairie Wisconsin he gave me 10 over 9!
KB8LPZ Cincinnati, OH he gave me 4X1
KC0CZI Jefferson City, MO he gave me 5X9
UT4MW - Ukraine!, I broke a pileup!! he gave me 5X4
ER4DX - Moldova!, he gave me 5X6
Not bad for a portable antenna system for camping!
If you have any further questions/comments about this antenna, feel free to