40m small quad - help needed

CP2235@aol.com CP2235@aol.com
Wed, 2 Oct 1996 12:23:17 -0400


Hello antenna cracks,

I need your advice in the following project:

years ago I read some article about building a reduced size 2 ele Quad for
40m.
I think it was originally designed by a G3 amateur. Sorry  I cannot remember
the call and I do not find the article anymore.

This is the scheme:
The size of the antenna loop is reduced to about 75 percent (each side about
26ft/8m long).
Capacitive linear loading is used to resonate the loop:
Loading wires are connected to the center point of the vertical wires and are
run parallel to the vertical wires at a small distance (2 ft/60cm or so?).
These loading wires are strung between the normal quad spreaders as well and
are nearly as long as the vertical wires themselves.

My questions are:
Does anyone have the correct dimensions for this antenna?
(DRIVEN ELEMENT:
 loop length, loading wire length, spacing distance of loading wire to
element)
(REFLECTOR:
 loop length, loading wire length, spacing distance of loading wire to
element)

or any FORMULAS I can start with? I could start with the approximate
dimensions I still have in my head, but I think it will take quite a long
time then.

Reflector resonate frequency should be about 3 percent lower - RIGHT?
I think a gamma match will do nice for feeding - RIGHT?

Any other comments?

Anything will be appreciated. Please mail directly to CP2235@aol.com
I will collect the answers and provide a sum-up for anybody interested in
this topic.
Thank you very much. With a bit of luck we will meet with this antenna in
both WWDXs this year.

73,
      Con, DF4SA



Cornelius Paul            DF4SA              CP2235@aol.com




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