I guess that an old man who hasn't been into electronics very long.
But, I do possess a fair amount of common sense. I can see that
you guys can't or won't help me figure out my problem. Too many
issues here. Everyone has SOME area of excellence.
I just haven't found the right person who WILL help. Life is
filled
with people who can only see their way. Words are not as
powerful as IDEAS. Thanks for the "words", fellas.

Paladin wrote:
I guess that an old man who hasn't been into electronics very long.
But, I do possess a fair amount of common sense. I can see that
you guys can't or won't help me figure out my problem. Too many
issues here. Everyone has SOME area of excellence.
I just haven't found the right person who WILL help. Life is filled
with people who can only see their way. Words are not as
powerful as IDEAS. Thanks for the "words", fellas.

I think there are people willing to help but from your original
posting, there was not enough information for me to model your
antenna. I don't recall you even telling us the length of your
inv-V dipole. And what did you mean by "linear loaded"?
--
73, Cecil http://www.qsl.net/w5dxp

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.....:-)

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

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.

Paladin wrote:
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.

So like this?

70' 70'
-------------------------+ +-------------------------
| |
+------------------------+ +------------------------+
| |
+------------------------+ +------------------------+
| |
| |
| |
feedline
--
73, Cecil http://www.qsl.net/w5dxp

Cecil Moore wrote:
Paladin wrote:

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.


So like this?

70' 70'
-------------------------+ +-------------------------
| |
+------------------------+ +------------------------+
| |
+------------------------+ +------------------------+
| |
| |
| |
feedline

Hi Cecil, that's what I understand. To a first approximation, on 160
meters, the radiation from the two segments furthest from the feed point
should cancel. That would leave the effective antenna as a shortened
dipole with a length of 55 degrees per leg [two 80 foot long segments
per side]. This should yield a radiation resistance of somewhere around
10 to 15 ohms with a significant capacitive reactance of between 500 to
1000 ohms.

His 100 foot long feed line is only 69 degrees long. I believe this
short a matching section, i.e. "stub", may be insufficient to achieve a
'50 ohm' match.

I would expect the antenna gain to be -2 to -3 dBd.

Comments??

Paladin wrote:
"I just haven`t found the right person who will help."

Help, it seems, is the answer Paladin wants to hear. When you want to
put 8 pounds of crap in a 4-pound bag, life is often that way. You
quickly run out of good advice.

When a respondent says there`s no computer program to tell you how to
linearly-load an antenna wire, you are invited to prove him wrong. The
ARRL Antenna Book says:
"Since the dimensions and spacing of linear-loading devices vary greatly
from one antenna to another, the best way to employ this technique is to
try a length of conductor 10% to 20% longer than the difference between
the shortened antenna and the full-size dimension for the linear-loading
device. Then use te "cut-anhd-try" method, varying both the spacing and
length of the loading device to optimize the match."

You might write a program for that.

Best regards, Richard Harrison, KB5WZI