"Dan Richardson @mendolink.com" ChangeThisToCallSign wrote in message
...
On 15 Jan 2004 16:41:15 -0800, (Art Unwin KB9MZ)
wrote:

I found it interesting to read on a particular
antenna page that the antenna future will revolve
around what the person was presenting.
He may well be correct if we are all lemmings but
people who piddle with antennas are a different breed.
Personaly I see antennas gyrating towards smaller
antennas where radiation per unit length will finish
at the top of the heap
Antenna engineers have become so focussed on the half
wave patterns that they have completely ignored the
low efficiency portions at the ends of a half wave
antenna. Future antennas most surely will remove these
low efficient radiator parts together with the addition
of coupling techniques that will help to move away
from the Yagi syndrome, together with resolving the
of a "lossless" coupling direct to the transmitter
that will obsolete the need of matching interface.
Ofcourse this is where my intersts lie, but does this
vision of the future match yours or am I thinking
of the impossible? One noted Russion scientist stated
that theoretically radiation can come from a single point,
is this part of our future or just an impossible dream ?
Best regards, and please put your pea shooters aside
and try to get along rather than looking for
ten seconds of cheap glory.

Art Unwin KB9MZ......XG

Hitting the juice again eh?

Danny, K6MHE

And your reason for saying that is......... what?
Art

On Fri, 16 Jan 2004 02:39:56 GMT, " Art Unwin KB9MZ"
wrote:
Hitting the juice again eh?

Danny, K6MHE

And your reason for saying that is......... what?
Art

Probably because you passed up four technical questions:
could you provide more detail?
What is "Yagi syndrome"
lossless coupling to the transmitter?
What low efficiency portions?
to indulge yourself asking this.

For goodness sake why don't you and Danny put away your pea shooters and
handle yourselves in an orderly manner. I have not avoided or passed up any
questions, I am just in a standby mode to see what others visualise
as what the future might bring or what they would like to see ,after which I
will elaborate on my thoughts even tho
some lurkers such as yourself may well be concentrating on distance and
accuracy of their pea shooters.
Art
"Richard Clark" wrote in message
...
On Fri, 16 Jan 2004 02:39:56 GMT, " Art Unwin KB9MZ"
wrote:
Hitting the juice again eh?

Danny, K6MHE

And your reason for saying that is......... what?
Art

Probably because you passed up four technical questions:
could you provide more detail?
What is "Yagi syndrome"
lossless coupling to the transmitter?
What low efficiency portions?
to indulge yourself asking this.

On Fri, 16 Jan 2004 04:14:14 GMT, " Art Unwin KB9MZ"
wrote:
I have not avoided or passed up any questions,
could you provide more detail?
What is "Yagi syndrome"
lossless coupling to the transmitter?
What low efficiency portions?
Twice denied

Richard,
My peashooter is racked. Guess that means I'm just
lurking? But I'm really enjoying the turkey shoot.
'Doc

'Doc wrote in message ...
Richard,
My peashooter is racked. Guess that means I'm just
lurking?


Nah, it means your in your usual position, riding on someone else's shirt tail.

Jaro,
Thanks! Still batting a 1000, I see...
All wrong.
'Doc

Art, KB9MZ wrote:
"Antenna engineers have become so focussed on the half wave patterns
that they have completely ignored the low efficiency portions at the
ends of the half wave antenna. Future antennas most surely will remove
these low efficient (sic) radiator parts together with the addition of
coupling techniques that will help to move away from the yagi syndrome."

Don`t hold your breath!

Antenna engineers are focussed on 1/2-wave antenna patterns because
those are the patterns produced by 1/2-wave antennas. A half-wave
antenna is resonant without a reflection from the earth or anything
else. Antenna system resonance is essential to remove reactive impedance
to antenna current flow. No current flow, no antenna operation.

The ends of a dipole have nearly zero radiation because current at the
ends is nearly a zero sum of incident and reflected currents.The H-field
is thus cancelled. Radiation ends where the current ends. A 1/4-wave
back from the reflection point, incident and reflected currents are
in-phase and strong radiation is possible.

What Art calls the "yagi syndrome" is a preference for an antenna which
has only one feedline attachment point and gets about as much gain per
length of wire as any. Size is important for wind loading in addition to
antenna cost and performance. The yagi is a big performer in spite of
its small size.

Yagi elements must be nearly 1/2-wave in length because that`s the
minimum length required to accept significant induced current in a
parasitic element=A0far from ground.

If you were to chop off the ends of a 1/2-wave antenna, you would have
to replace them with another mechanism to bring resonance back to the
shortened dipole. These artifices are almost always lossier than the
lost conductor removed from the antenna. A capacitance hat is an
exception, but this is hardly smaller.

At night it is often more rewarding to look for something lost, not
because the site seems probable, but because the search site is the only
illuminated spot.

Best regards, Richard Harrison, KB5WZI

Richard Harrison wrote:

Art, KB9MZ wrote:
"Antenna engineers have become so focussed on the half wave patterns
that they have completely ignored the low efficiency portions at the
ends of the half wave antenna. Future antennas most surely will remove
these low efficient (sic) radiator parts together with the addition of
coupling techniques that will help to move away from the yagi syndrome."

Don`t hold your breath!

Makes me wonder if Art has ever considered cutting-off the unused parts
of the tires on his car. ;-)

73, Jim AC6XG