Log-Periodic Antenna Design
 

On Thu, 20 Nov 2008 15:35:53 -0800, Roy Lewallen wrote:
Rich Grise wrote:
On Wed, 19 Nov 2008 22:53:28 -0800, Richard Clark wrote:
. . .
73's

"Best Regardses"? ;-)

No, that's "Best Regards's". It's the possessive, not plural, form of
"Best Regards". I think the grammar is part of the same dialect as the
verb "destinate" (as in "I've just destinated"), but you'd have to ask
Richard about that -- he's the one with the English Lit degree.


I read it in a QST or so back in the 1960's. :-)

Thanks!
Rich
ex-WN0GJS

Log-Periodic Antenna Design
 

On Thu, 20 Nov 2008 15:30:26 -0800, Roy Lewallen wrote:
GregS wrote:

Ever hear of the BOW TIE. Its a sort of Fractal antenna. Having a wide
band. It could be improved by making it a full fractal.

That's interesting. In what way(s) is it improved by making it fractal?
How much is the improvement? Can you point me to a reference about this
which gives some quantitative data?


http://www.google.com/search?hl=en&q...earch&aq=f&oq=

Hope This Helps!
Rich

Log-Periodic Antenna Design
 

Rich Grise wrote:
On Thu, 20 Nov 2008 15:30:26 -0800, Roy Lewallen wrote:
GregS wrote:
Ever hear of the BOW TIE. Its a sort of Fractal antenna. Having a wide
band. It could be improved by making it a full fractal.
That's interesting. In what way(s) is it improved by making it fractal?
How much is the improvement? Can you point me to a reference about this
which gives some quantitative data?


http://www.google.com/search?hl=en&q...earch&aq=f&oq=

Hope This Helps!
Rich

Sorry, it doesn't. Among the claims, trolls for investors, and
testimonials, where is the quantitative data showing that a fractal
antenna is in any way better than a bow tie, in what ways, and how much?
In other words, exactly where is the evidence on which you based your
statement?

Roy Lewallen, W7EL

Log-Periodic Antenna Design
 

On Fri, 21 Nov 2008 00:51:28 GMT, Rich Grise wrote:

On Thu, 20 Nov 2008 15:30:26 -0800, Roy Lewallen wrote:
GregS wrote:

Ever hear of the BOW TIE. Its a sort of Fractal antenna. Having a wide
band. It could be improved by making it a full fractal.

That's interesting. In what way(s) is it improved by making it fractal?
How much is the improvement? Can you point me to a reference about this
which gives some quantitative data?


http://www.google.com/search?hl=en&q...earch&aq=f&oq=

Hope This Helps!
Rich


Hi Rich,

Tacking the new-age term of "fractal" to antenna does not
automatically bring:
1. Widebandedness;
2. Gain;
3. Small size.

The link above fairly confirms it in the fog of offering.

I could expand upon this - but the interest of those who become
suddenly engaged with the topic rarely translates into a meaningful
discussion, and never leads to an actual construction.

73's
Richard Clark, KB7QHC

Log-Periodic Antenna Design
 

"Ralph Mowery" wrote in message
...

snip

It may not take too much antenna.

It doesn't.

I have two converter boxes, one Magnavox, one Zenith. I just now tried my
local stations with them using a straight 24-inch alligator clip lead as the
antenna. Location is a residential garage in the San Diego suburbs. Stucco
walls, metal garage door closed, overhead fluorescent lights on.
Transmitters in three different locations.

All the UHF locals came in, 10 transmitters with about twenty total
programs. The one low-power VHF did not. Looping the clip lead back and
clipping the end to the F-connector produced about the same results. (Lost
one TJ station.)

When I "upgraded" to a POS 2-bay bowtie in the rafters (about 8 feet up),
all eleven locals came in, plus KCBS from LA . On the Zenith box, arguably
a better unit, I got two more LA channels, although one of them had some
intermittent freezing and tiling.

If even poor antennas work well, why all the whining?

"Sal"
(KD6VKW)

Log-Periodic Antenna Design
 

Roy Lewallen wrote:
Rich Grise wrote:
On Wed, 19 Nov 2008 22:53:28 -0800, Richard Clark wrote:
. . .
73's

"Best Regardses"? ;-)

No, that's "Best Regards's". It's the possessive, not plural, form of
"Best Regards". I think the grammar is part of the same dialect as the
verb "destinate" (as in "I've just destinated"), but you'd have to ask
Richard about that -- he's the one with the English Lit degree.

My Webster's unabridged dictionary gives the following
examples of the correct way to pluralize numbers.

"figure 8's", "the 1890's", "the 20's"

73 is a number that stands for "Best Regards"

73's would be "Lots of Best Regards".
--
73, Cecil http://www.w5dxp.com

Log-Periodic Antenna Design
 

Roy Lewallen wrote:
Sorry, it doesn't. Among the claims, trolls for investors, and
testimonials, where is the quantitative data showing that a fractal
antenna is in any way better than a bow tie, in what ways, and how much?
In other words, exactly where is the evidence on which you based your
statement?

http://ieeexplore.ieee.org/Xplore/lo...number=1610336

If you are a member of IEEE, you can access this paper:

Multiband behavior of wideband Sierpinski fractal bow-tie antenna
Yamini, A.H.; Soleimani, M.
Microwave Conference, 2005 European
Volume 3, Issue , 4-6 Oct. 2005 Page(s): 4 pp. -
Digital Object Identifier 10.1109/EUMC.2005.1610336
--
73, Cecil http://www.w5dxp.com, IEEE

Log-Periodic Antenna Design
 

Sal M. Onella wrote:
If even poor antennas work well, why all the whining?

I've not had any problems with the UHF circular loop
that comes with standard rabbit ears. The only problem
I've had is with VHF channels on the dipole. I need
a weatherproof version of my RS rabbit ears.
Unfortunately, ABC is Channel 7 here in Tyler, TX.
--
73, Cecil http://www.w5dxp.com

Log-Periodic Antenna Design
 

Rich Grise wrote:
On Thu, 20 Nov 2008 13:50:57 +0000, Dave wrote:
Log periodics are not necessary for sub-octave operation.

http://www.youtube.com/watch?v=EWQhlmJTMzw

Dude! Awesome! And this one doesn't even have a reflector!. I
wonder how far I should hang it in front of the venetian blind. ;-)

Thanks!
Rich


I don't have time to search for it, but there's also a dual quad UHF TV
antenna that's easy to build with the same kind of materials. I prefer
steel tie wire to coat hangers because it's easier to work with.

Log-Periodic Antenna Design
 

On Nov 21, 7:36�am, Cecil Moore wrote:
Sal M. Onella wrote:
If even poor antennas work well, why all the whining?

I've not had any problems with the UHF circular loop
that comes with standard rabbit ears. The only problem
I've had is with VHF channels on the dipole. I need
a weatherproof version of my RS rabbit ears.
Unfortunately, ABC is Channel 7 here in Tyler, TX.
--
73, Cecil �http://www.w5dxp.com

Now that the FCC has given a green light to whitespace device
deployments (particularly those that rely solely on spectrum-sensing
technology), you may find you need a better antenna than a simple
loop, bowtie or coat hanger.

For those of you who are not following the issue, a quote in this
week's TV Technology pretty much sums it up:

"MSTV (Maximum Service Television) told the Commission Oct 31 that the
least the FCC could do is subject the devices to rigorous testing
beforehand and ensure fair and reliable tests to prevent interference
to DTV. In a filing, MSTV also attacked the FCC proposal that a
device should be able to detect signals as low as -114 dBm, a level
MSTV equated with setting a smoke detector to only be able to detect a
raging fire."

Whitespace devices will also cause great harm to wireless microphones,
particularly older models.

-mpm