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Author Topic: ONE WIRE ANTENNA_"UNIFILIAR"  (Read 338 times)
PY9FP
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Posts: 34




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« on: September 21, 2005, 09:10:09 PM »

Hi! for all.
My question is if does anyone know something about "unifilar" (said here in Brazil) or a one wire antenna, because I am interested in that kind of stuff. I have read something about it here in Brazil but I have a lot of doupts yet, how to construct it, especially grounding it, I run across that it is not the dipolo....my interest is for 20m.band.
Your help will be deeply appreciated.
73 de:PY9FP..francisco barcellos/Brazil
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KA0GKT
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Posts: 555




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« Reply #1 on: September 21, 2005, 09:35:11 PM »

If there is a website with a diagram, please post the URL.  One picture is worth 1,000 words.

Technically, an end fed antenna is Unifillar antenna as would be a helix or helically wound antenna like the Hamstick antennas.

Without a visual pointg of reference, I'm at a loss to come up with anything.

73 DE KAØGKT/7

--Steve
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PY9FP
Member

Posts: 34




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« Reply #2 on: September 22, 2005, 07:09:15 AM »

No! Steve! I donot know anything about it in a website, I have read about it here in Brazil on a magazine, and my doupt is if it look likes a long wire dipolo or a loop in delt configuration.
73
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WB6BYU
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Posts: 13486




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« Reply #3 on: September 22, 2005, 01:06:03 PM »

Francisco -

There are two common types of antenna that could be called
"unifiliar", or "single wire".  One is often called a
"long wire" or "random wire", that is, a piece of wire
connected to the transmitter at one end and tied to a
tree or other support at the other.  (It need not be
straight, and may have several other supports as well.)
If this antenna is an 1/4 or 3/4 wave long, it often can
be connected directly to a transmitter without using any
coax cable or external tuner.  (My first SSB antenna was
this type.)  Other lengths of wire will also work, but
will require some type of tuner or matching device to
match the antenna impedance to the radio.

The other type of antenna is a half-wave antenna with a
single wire feedline, often called a "Windom".  When built
for 40m, this antenna will also work on 20 and 10m
(all even multiples of the design frequency.)  This is
a half-wavelength wire with a single feed wire connected
at about 1/3 of the length of the antenna.  The feed wire
then goes to the transmitter, which will require an
impedance matching network - the feed wire is supposed
to be around 600 ohms, but this will vary in practice.

There was an antenna design introduced recently that was
wound on a toroid core, and may have been called "unifiliar",
but I don't think it actually worked very well.

If one of these descriptions matches the antenna you are
interested in, let us know and we can give you further
information about it.
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PY9FP
Member

Posts: 34




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« Reply #4 on: September 22, 2005, 01:59:25 PM »

Hi!Dale..
Thanks a bunch for your precious info around my question; correct, that one answer reached directly my questioning.
Yes, I am interested in further information about it, according your post description, especially randon wire and windom.
BTW, my rig is an IC-718, with AT in its circuit.
Vy 73.
Francisco
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WA6BFH
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Posts: 646


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« Reply #5 on: September 22, 2005, 04:44:28 PM »


I think that any antenna that is not well balanced, is simply unfair!

I do though offer points for diversity. Dual diversity I mean!
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PY9FP
Member

Posts: 34




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« Reply #6 on: September 22, 2005, 06:31:21 PM »

hello!Dr OM ..tnx for your post.
Do you mean an antenna for each band? is that true?
vy 73..
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KB4QAA
Member

Posts: 2450




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« Reply #7 on: September 22, 2005, 07:26:02 PM »

He was making a joke about the antenna type. In english "balanced" can also mean "impartial" or "without bias of opinion" or "fair".   Thus his joke was about a single wire or unifilar antenna is not balanced because it does not have two sides, like both opinions of an argument, it is unfair.  Smiley

73, good luck on your unifilar antenna hunt.  Let us know if you find a website or description of it.

Bill
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PY9FP
Member

Posts: 34




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« Reply #8 on: September 23, 2005, 06:00:07 AM »

tnx Bill, for teaching me about joke and the meaning of "balanced", "impartial" or "without bias of opinion" or "fair".
It is very important to me getting in touch with as many as possible words in english, as I like very much learning more and more this so important international and technical language.
I am assiduous E.Ham Forum member, and have gotten a lot of knowledges through Elmers Forum.
BTW, all kind of joke are welcome, so increase my vocabulary.
Hope cu on the airwaves, especially CW mode.
Vy 73.
PY9FP..francisco barcellos
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PY9FP
Member

Posts: 34




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« Reply #9 on: September 23, 2005, 06:59:57 PM »

ok!Dale..received your precious explanations about twinlead...I will
try it as soon as possible.
And tnx for your close attention in replying me.
Vy 73 de: PY9FP..francisco barcellos/Brazil

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