Answer to Dipole Double-Resonance Problem
 

Hi,

Ok, so the other thread died out, but
I thought i should give the other answer
anyhow.

One poster infered one portion of the
fix, which was the height of the dipole
was increased from 3.5 ft to 6.5 ft.

The other change we made was with
the spacing BETWEEN the 1/4 wave
elements; i had originally made the
elements too far apart.

Bringing them closer together and
raising the height improved the SWR
and made the antenna resonant at
only one frequency within 88-108 MHz
(not including harmonics).

Thanks for playing!


Slick

On 21 Nov 2004 19:56:40 -0800, (Dr. Slick) wrote:
Bringing them closer together and
raising the height improved the SWR
Has absolutely nothing to do with:
and made the antenna resonant at
only one frequency within 88-108 MHz

73's
Richard Clark, KB7QHC

"Dr. Slick" wrote in message
om...
Hi,

Ok, so the other thread died out, but
I thought i should give the other answer
anyhow.

One poster infered one portion of the
fix, which was the height of the dipole
was increased from 3.5 ft to 6.5 ft.

The other change we made was with
the spacing BETWEEN the 1/4 wave
elements; i had originally made the
elements too far apart.

Bringing them closer together and
raising the height improved the SWR
and made the antenna resonant at
only one frequency within 88-108 MHz
(not including harmonics).

Thanks for playing!


Slick

Did you measure the original distance tip-to-tip, or did you measure 2X the
length of one side independent of the spacing in the middle?

Tam/WB2TT

Richard Clark wrote in message . ..
On 21 Nov 2004 19:56:40 -0800, (Dr. Slick) wrote:
Bringing them closer together and
raising the height improved the SWR

Has absolutely nothing to do with:

and made the antenna resonant at
only one frequency within 88-108 MHz

73's
Richard Clark, KB7QHC


God, you are truly lame.

Go try it yourself.


Slick

"Tam/WB2TT" wrote in message ...

Did you measure the original distance tip-to-tip, or did you measure 2X the
length of one side independent of the spacing in the middle?

Tam/WB2TT


I'm not sure what you mean here.

I made sure that the end-to-end length of
each 1/4 wavelength section was the same
size for each section of the dipole. We
use aluminum tubing and hoseclamps for
adjusting the length.

But when i adjusted the space between
the two sections, the length of each
section was NOT changed.

And yet the SWR improved, and
there was a single resonance between
88-108 Megs, as it should normally be.


Slick