On 14 Nov 2004 04:10:05 -0800, (Dr. Slick) wrote:
Don't need to. "Jack of all trades and master of
none"
How apropos.

Are you still enjoying the legs (stumps actually) on this Lee? Time
and tide wasn't waiting for a response to your posts either. Perhaps
you might attract an answer if you put it in the format of 20
questions:
Is it bigger than a breadbox? :-)

73's
Richard Clark, KB7QHC

'Doc wrote in message . com...
Dr. Slick wrote:
"(1)A properly tuned and positioned dipole will
be resonant at only one frequency.
(2)Double-dips are a bad sign, and the return loss suffers."

(1) - Nope, just not true.
(2) - Not true either. (see #1)


What i meant to say was, a properly tuned
simple dipole will be resonant at only one
frequency and it's harmonics.

My double dips were not harmonically related.


With the two 'dips' not being harmonically related, it
appears that there is some 'other' reason, the feed line
for one, or something near the antenna (a person for instance?).
'Doc


raising the height of the dipole above the ground
from 3.5 to 6.5 feet was one of the things i did to
fix this problem.

The other one no one has guessed yet...


S.

"Dr. Slick" wrote in message
om...
'Doc wrote in message
. com...
Dr. Slick wrote:
"(1)A properly tuned and positioned dipole will
be resonant at only one frequency.
(2)Double-dips are a bad sign, and the return loss suffers."

(1) - Nope, just not true.
(2) - Not true either. (see #1)


What i meant to say was, a properly tuned
simple dipole will be resonant at only one
frequency and it's harmonics.

My double dips were not harmonically related.


With the two 'dips' not being harmonically related, it
appears that there is some 'other' reason, the feed line
for one, or something near the antenna (a person for instance?).
'Doc


raising the height of the dipole above the ground
from 3.5 to 6.5 feet was one of the things i did to
fix this problem.

The other one no one has guessed yet...


S.
This sounds like 20 questions. You are not telling us what you have. One
would not expect somebody to measure an antenna at a height of 3 feet. A
dipole would have an impedance of around 75 Ohms, which would give an SWR
into 50 Ohms of around 1.5:1 Are you using 50 Ohm coax and a 50 Ohm meter?
Is there a gamma match, or such, to adjust? Is it a dipole or a folded
dipole? Is there a balun? Did you buy the antenna or build it (I suspect the
intent would be different)? Since you are using an SWR meter, are you
putting enough power into it to get out of the nonlinear range?

Tam/WB2TT

Tam, WB2TT wrote:
"One would not expect somebody to measure an antenna at a height of 3
feet."

For reception of nearby broadcast stations a wire at 3 feet above the
earth is probably fine but the wire would have a low radiation
resistance.

The radiation resistance of a 1/2-wave dipole versus its height above
ground in wavelengths is probably a familiar graph for many. It starts
at zero ohms at zero height and rises in an almost straight inclined
line to about 99 ohms at nearly 5/8-wavelength. Then, with increased
height, the radiation resistance oscillates as a damped wave around 73
ohms.

Best regards, Richard Harrison, KB5WZI

"Tam/WB2TT" wrote in message ...


raising the height of the dipole above the ground
from 3.5 to 6.5 feet was one of the things i did to
fix this problem.

The other one no one has guessed yet...


S.
This sounds like 20 questions. You are not telling us what you have. One
would not expect somebody to measure an antenna at a height of 3 feet. A
dipole would have an impedance of around 75 Ohms, which would give an SWR
into 50 Ohms of around 1.5:1 Are you using 50 Ohm coax and a 50 Ohm meter?


Yes, all 50 Ohms.


Is there a gamma match, or such, to adjust?

No. But hint: a physical parameter of the
dipole was adjusted.



Is it a dipole or a folded
dipole? Is there a balun? Did you buy the antenna or build it (I suspect the
intent would be different)? Since you are using an SWR meter, are you
putting enough power into it to get out of the nonlinear range?


MFJ-259. Home-made dipole using aluminum tubing.

There are only so many physical parameters of a
dipole, folks! Just list them and you should hit it!


Slick

"Dr. Slick" wrote in message
om...
"Tam/WB2TT" wrote in message
...


raising the height of the dipole above the ground
from 3.5 to 6.5 feet was one of the things i did to
fix this problem.

The other one no one has guessed yet...


S.
This sounds like 20 questions. You are not telling us what you have. One
would not expect somebody to measure an antenna at a height of 3 feet. A
dipole would have an impedance of around 75 Ohms, which would give an SWR
into 50 Ohms of around 1.5:1 Are you using 50 Ohm coax and a 50 Ohm
meter?


Yes, all 50 Ohms.


Is there a gamma match, or such, to adjust?

No. But hint: a physical parameter of the
dipole was adjusted.



Is it a dipole or a folded
dipole? Is there a balun? Did you buy the antenna or build it (I suspect
the
intent would be different)? Since you are using an SWR meter, are you
putting enough power into it to get out of the nonlinear range?


MFJ-259. Home-made dipole using aluminum tubing.

There are only so many physical parameters of a
dipole, folks! Just list them and you should hit it!


Slick

Having no adjustments, and presumably no 62 Ohm coax, you must have bent it
into a V to get 50 Ohms. If you put a parasitic element on it, it is not a
dipole.

Tam/WB2TT

"Tam/WB2TT" wrote in message ...

MFJ-259. Home-made dipole using aluminum tubing.

There are only so many physical parameters of a
dipole, folks! Just list them and you should hit it!


Slick

Having no adjustments, and presumably no 62 Ohm coax, you must have bent it
into a V to get 50 Ohms. If you put a parasitic element on it, it is not a
dipole.


I didn't have to do that. It's a straight regular dipole.

No parasitic either.


s.

Having no adjustments, and presumably no 62 Ohm coax, you must have bent
it into a V to get 50 Ohms.

================================

Having no record of who said what, or what the discussion was about, someone
may be interested in little program INV_VEE which, amongst other things,
demonstrates how the feedpoint impedance of an inverted-V dipole varies with
the enclosed angle from 0 to 180 degrees for any height above ground.

Download INV_VEE from website below.
----
.................................................. ..........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........