feedlines and strange intereactions
 

The elements are "linear-loaded" . They are folded back on
themselves.
The phsical length is 70ft.,But the electrical length is 210ft. long
!
Now, is this strange dipole a 140ft. long,OR is it 420ft. long ? ?
That's why the feedline is so much problem............I've built
over
2 doz. antennas;this one IS tricky ! I have only 1/8 acre of land;
Hence the problems with dipole lengths,and feedline lengths.....:-)

feedlines and strange intereactions
 

Paladin wrote:
The elements are "linear-loaded". They are folded back on themselves.
The phsical length is 70ft.,But the electrical length is 210ft. long

Something like this? (fixed font)

35' 35'
-------------------------+ +-------------------------
| |
+------------------------+ +------------------------+
| |
+------------------------+ +------------------------+
| |
| |
| |
feedline

How far apart are the adjacent wires spaced?
--
73, Cecil http://www.qsl.net/w5dxp

feedlines and strange intereactions
 

But 'Experts' need to know the length of the antenna which, to the
best of my knowledge, wasn't given in the original posting. That's
why I recommended EZNEC.
--
73, Cecil
================================

Dear Cec,

So, if you had anything to say, why didn't you just ask him how long
is his antenna instead of sending him off on a wild goose chase?

I must admit you got nearer to discovering what was missing than I
did. Let's see what happens now.
----
Reg, G4FGQ

feedlines and strange intereactions
 

Reg Edwards wrote:
So, if you had anything to say, why didn't you just ask him how long
is his antenna instead of sending him off on a wild goose chase?

Reg, a standing recommendation of mine is to download the free
demo version of EZNEC and have fun learning how to use it.
Any amateur radio operator who succeeds in doing so will be
rewarded for the effort expended (and was also a source of
extreme pleasure in my case). ELNEC/EZNEC and the Smith
Chart (Microsmith) are the most useful tools I have ever
encountered for comprehension of antenna systems. (Not
considering reference books as "tools".)
--
73, Cecil http://www.qsl.net/w5dxp

feedlines and strange intereactions
 

Cec, as an aside, when people are conversing with each other, 50
percent of the information passing to and fro is conveyed by body
language.

Body language is completely lacking when conversing via newsgroups.
This can very easily lead to misunderstanding and futile argument.

People should check and recheck what they have said before posting.
The existence of certain types of spelling mistakes and obvious
grammatical errors are a guide to the care and attention which has
been paid by the sender to saying what he intended to say.

I admit, very careless senders do not deserve any replies. Not because
absence of reply is an unsaid reprimand but because they have
indicated their inability to understand a reply if they get one.

Then there are trollers!

This message is primarily intended for people seeking solutions to
problems.

I have had only two glasses of white wine. (South African).

And I don't know how to use a spell-checker even if I had one.
----
Yours, Reg, G4FGQ

feedlines and strange intereactions
 

"Cecil Moore" wrote

Reg, a standing recommendation of mine is to download the free
demo version of EZNEC and have fun learning how to use it.
Any amateur radio operator who succeeds in doing so will be
rewarded for the effort expended (and was also a source of
extreme pleasure in my case). ELNEC/EZNEC and the Smith
Chart (Microsmith) are the most useful tools I have ever
encountered for comprehension of antenna systems. (Not
considering reference books as "tools".)
--
===================================
Dear Cec,

In the present context, in the absence of body language, your praise
of EZNEC can perhaps be misconstrued as my criticism of that erstwhile
computer program.

On the contrary, I quite agree with your comments.

Regarding the Smith Chart, I have myself never found it to be of any
use. In fact I don't know how to use it. I am aware of its
long-standing existence, and what it is purported to achieve, from
this newsgroup and from the one or two ancient 'bibles' which I seldom
refer to.

But the absence of a Smith Chart may be due to some vague shortcoming
in my education for which I have no responsibility. So I have never
felt myself to be handicapped in any way. Indeed, I have gained from
this and other websites the impression that I am considered to be a
transmission line 'expert'. But I claim only to be a well-educated,
useful engineer who also happens, in retirement, to be a radio amateur
with the ability to express myself in plain written English.

To continue with my earlier message, I have just finished a third
glass of white, South African wine.

But enough about me. What are you doing about Bush?
----
Reg.

feedlines and strange intereactions
 

And I have never been criticised for begining a sentence with "and".
----
Reg.

feedlines and strange intereactions
 

Reg Edwards wrote:
But enough about me. What are you doing about Bush?

I don't have to do anything about Bush, Reg. He is
fast running out of feet in which to shoot himself.
--
73, Cecil http://www.qsl.net/w5dxp

feedlines and strange intereactions
 

The wires are close. The builder used rotor feed line. 3 equal
lengths of wires 70ft. long
THAT make one element. there is one on the oppisite side.

feedlines and strange intereactions
 

I believe that REG and CECIL have lost the idea of what I asked in
the begining.
I'm NOT a dog going around in a circle chasing his tail ! I want
some FACTS.
NOT endless chatter, about the worlds demise!
I have a bought antenna made of wire. Yes, I should
have built it
myself,BUT I didn't. I need to know how to fix "said" antenna, and
intergrate
it into my small land. 1/8 of an acre. ON4UN's book on "low band
dxing"
states that there aren't any PROGRAMS for linear-loaded ant.'s out
there.
oh well, I guess that
I'll just haffta go back to 2m !