On 13 Jun, 23:01, Richard Clark wrote:
On Wed, 13 Jun 2007 19:45:35 -0500, Tom Ring
wrote:



Actually they could have gain that low and still be directional.
...
Heck, I bet someone here may have even done something like it for some
reasonable engineering design.

... tsk, tsk, tsk. Such a fall from grace for the fractal antenna.
Gone, and long forgotten.

73's
Richard Clark, KB7QHC

If Fractus is the Fractal antenna business then it is still doing
well.
That was another antenna that amateurs tried to remove from the
face of the earth because it provided a new aproach to antennas.
Seems like professionals in the antenna industry are not made
from the same mold as the self styled amateur experts that
deride the new from their couch as they slowly pass away.
When they become silent keys any lock that they may have had
on the new decays in lock step with their gutless frames
Art

On 13 Jun, 23:01, Richard Clark wrote:
On Wed, 13 Jun 2007 19:45:35 -0500, Tom Ring
wrote:


snip

... tsk, tsk, tsk. Such a fall from grace for the fractal antenna.
Gone, and long forgotten.

Make up your mind. I'll now change it back to
"It is NOT gone and NOT forgotten"

It will be exhibited at the antenna exposition in Denver this year.
Maybe your name will be mentioned as the one that knew about it
all the time.And you tell me that you are heavily sought after
by entropreneurs to oversee technical propositions before
a committment is made? Brevity is not your strong point, 400
pages of index is way to much, 300 pages on a fractal
is also way to much. Remember your attempt at a patent,
to large to fit into a "shoe", to large to fit in any cabinet
thus placed on the floor never to be found or read and where
pages were sucked in by passing vacuum cleaners.
Hark the phone is ringing again, maybe it is IBM begging you again.



73's
Richard Clark, KB7QHC

In article , Tom Ring
wrote:

It's tough to get gain that low unintentionally. If they are
commercial, could you please point me at a web site? I'd love to see
why they made these.

tom
K0TAR

Hello, and you can just integrate a pad into the antenna feedpoint and
market it as a broadband antenna - Works 2-30 MHz with no tuning required!
;-) Sincerely, and 73s from N4GG0,

John Wood (Code 5550) e-mail:
Naval Research Laboratory
4555 Overlook Avenue, SW
Washington, DC 20375-5337

"Tom Ring" wrote in message
. ..
amdx wrote:
I'm comparing elevation plots of an antenna. They have different
forward gains, this makes it difficult to compare the lobe shape.

Is there a way to equalize the gains to do a comparison?


Example: I have an antenna that is -19dbi and one that is -23dbi.
Can I add 4db of gain to one to make the comparison easier?
Mike



I am wondering what type of antenna has -19 or -23 dBi gain. I would
speculate that they are quite omnidirectional, and the patterns wouldn't
be significantly different.

It's tough to get gain that low unintentionally. If they are commercial,
could you please point me at a web site? I'd love to see why they made
these.

tom
K0TAR
I'm modeling a Flag antenna.
It is a directional antenna.
Small size for the low bands.
Btw, this site has one that has -43dbi gain.
http://taliaphoto.com/n4is/BIG_DUAL_LOOP.html
I'd like to have one!
Mike

Kinda thought so! got copy of THAT loop antenna-
Lots of loss, but abt 28 dB F-B ratio (great for
eliminateing stations off the back, and , as stated
very broadband! And the model at 12 mhz, did to
1.8 MHz , also 28 MHz- swr is flat (20:1)!, but
the directivity is seems to be flat,too. An
interesting antenna. Tks to Bill W5WVO for the
model! But the
4 db diff (on the angles of "radiation", probably
mean little on a change of pattern.maybe 2-3
degrees! (3dB points)! Definately NOT for trying
to xmit to! But with a 20 dB preamp looks like a
great recieve antenna! Jim NN7K


Example: I have an antenna that is -19dbi and one that is -23dbi.
Can I add 4db of gain to one to make the comparison easier?
Mike

I'm modeling a Flag antenna.
It is a directional antenna.
Small size for the low bands.
Btw, this site has one that has -43dbi gain.
http://taliaphoto.com/n4is/BIG_DUAL_LOOP.html
I'd like to have one!
Mike

amdx wrote:
I'm comparing elevation plots of an antenna. They have different
forward gains, this makes it difficult to compare the lobe shape.

Is there a way to equalize the gains to do a comparison?

Example: I have an antenna that is -19dbi and one that is -23dbi.
Can I add 4db of gain to one to make the comparison easier?
Mike

Under 'Desc Options', under '2D Misc', under 'Outer Ring',
you can set the gain of the outer ring to -19 dBi for
both antennas.
--
73, Cecil http://www.w5dxp.com

"Cecil Moore" wrote in message
et...
amdx wrote:
I'm comparing elevation plots of an antenna. They have different
forward gains, this makes it difficult to compare the lobe shape.

Is there a way to equalize the gains to do a comparison?

Example: I have an antenna that is -19dbi and one that is -23dbi.
Can I add 4db of gain to one to make the comparison easier?
Mike

Under 'Desc Options', under '2D Misc', under 'Outer Ring',
you can set the gain of the outer ring to -19 dBi for
both antennas.
--
73, Cecil http://www.w5dxp.com

Thank you Cecil, I'll give that a try.

"amdx" wrote in message
...

"Cecil Moore" wrote in message
et...
amdx wrote:
I'm comparing elevation plots of an antenna. They have different
forward gains, this makes it difficult to compare the lobe shape.

Is there a way to equalize the gains to do a comparison?

Example: I have an antenna that is -19dbi and one that is -23dbi.
Can I add 4db of gain to one to make the comparison easier?
Mike

Under 'Desc Options', under '2D Misc', under 'Outer Ring',
you can set the gain of the outer ring to -19 dBi for
both antennas.
--
73, Cecil http://www.w5dxp.com

Thank you Cecil, I'll give that a try.

I tried it Cecil, that only changes the scale of the plot, both antenna
patterns just move there relative positions.
I need to add gain to one pattern or subtract from the other and put them
on the same plot.
Thanks, Mike

amdx wrote:
I tried it Cecil, that only changes the scale of the plot, both antenna
patterns just move there relative positions.
I need to add gain to one pattern or subtract from the other and put them
on the same plot.

I guess I don't understand what you are wanting
to do. Is -19 dBi and -23 dBi the maximum gain
for each respective antenna? Or is that just some
point you want the radiation patterns to have in
common?
--
73, Cecil http://www.w5dxp.com

"Cecil Moore" wrote in message
et...
amdx wrote:
I tried it Cecil, that only changes the scale of the plot, both antenna
patterns just move there relative positions.
I need to add gain to one pattern or subtract from the other and put
them
on the same plot.

I guess I don't understand what you are wanting
to do. Is -19 dBi and -23 dBi the maximum gain
for each respective antenna?

Yes.

I want the maximum gain point of each antenna to
reach the same point on the plot.
As if I put a 4db amplifier on the -23dbi antenna.
Thanks, Mike