On Fri, 21 Nov 2008 09:00:09 -0500, "Bill Kearney"
wrote in
:

"DaveC" wrote in message
lobal.net...

Is there any reason to not go for the greatest gain antenna, given that
cost is not too important (within reason)?

Alligator effect. Wide mouth receiving everything.

"Alligator effect" normally refers to higher transmit power (not higher
antenna gain) -- big mouth, small ears.

If you don't need to
pickup everything then why bother? It just makes it harder for your WiFi
router to cut through all the noise of distant stations it doesn't
communicate with. ...

It actually usually makes sense, since higher gain means narrower
receive pattern, which better rejects off-axis interference.
Interference in exactly the same path is possible but unlikely.
--
Best regards, FAQ for Wireless Internet: http://wireless.navas.us
John Navas FAQ for Wi-Fi: http://wireless.navas.us/wiki/Wi-Fi
Wi-Fi How To: http://wireless.navas.us/wiki/Wi-Fi_HowTo
Fixes to Wi-Fi Problems: http://wireless.navas.us/wiki/Wi-Fi_Fixes

John Navas wrote:

...
"Alligator effect" ...

Brings to mind "Alligator Stations" I have contacted in the past--BIG
mouth (large power amplifer) no ears (poor reception on their ends) ...
grin

Regards,
JS

On Nov 21, 2:38*am, DaveC wrote:
Looking for outdoor omni "whip" antenna for 2.4 GHz.

Is there any reason to not go for the greatest gain antenna, given that cost
is not too important (within reason)?

There are scads of these on the 'net. I'm looking for someone who has
experience with one or more of them and can make a recommendation for one..

Thanks,
--
DaveC

This is an invalid return address
Please reply in the news group

I recently built a Franklin antenna for 2.4Ghz.
I highly reccommend it. Google WiFi and franklin antenna.

Jimmie

On Nov 21, 8:47*pm, JIMMIE wrote:
On Nov 21, 2:38*am, DaveC wrote:

Looking for outdoor omni "whip" antenna for 2.4 GHz.

Is there any reason to not go for the greatest gain antenna, given that cost
is not too important (within reason)?

There are scads of these on the 'net. I'm looking for someone who has
experience with one or more of them and can make a recommendation for one.

Thanks,
--
DaveC

This is an invalid return address
Please reply in the news group

I recently built a Franklin antenna for 2.4Ghz.
I highly reccommend it. Google WiFi and franklin antenna.

Jimmie

Also look up AMOS antenna. They are easy to make and work well


Jimmie

JIMMIE wrote:


Also look up AMOS antenna. They are easy to make and work well


Jimmie

Jimmie:

Excellent link, thanks; I will homebrew this when I get the time ...

However, with the reflector plate, it is not OMNI; but, for me this
would NOT be a problem ...

Good work,
regards,
JS

On Sat, 22 Nov 2008 12:08:54 -0800 (PST), JIMMIE
wrote:

On Nov 21, 8:47*pm, JIMMIE wrote:
I recently built a Franklin antenna for 2.4Ghz.
I highly reccommend it. Google WiFi and franklin antenna.
Jimmie

Also look up AMOS antenna. They are easy to make and work well
Jimmie

AMOS, Franklin, Sector, et al:
http://pe2er.nl/wifisector/
http://yu1aw.ba-karlsruhe.de/vhf_ant.htm
http://www.qsl.net/yu1aw/vhf_ant.htm
http://www.brest-wireless.net/gallery/AntenneAmos
http://www.brest-wireless.net/wiki/materiel:amos
http://www.brest-wireless.net/forum/viewtopic.php?id=75&p=2

NEC2 model:
http://802.11junk.com/jeffl/antennas/AMOS-7/
http://802.11junk.com/jeffl/antennas/AMOS-5/ (not optimized yet)

AMOS design:
http://www.qsl.net/yu1aw/amos_article.pdf

Inverted AMOS:
http://www.qsl.net/yu1aw/invertamos.pdf


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Sun, 23 Nov 2008 15:32:02 -0800, Jeff Liebermann
wrote:

NEC2 model:
http://802.11junk.com/jeffl/antennas/AMOS-7/
http://802.11junk.com/jeffl/antennas/AMOS-5/ (not optimized yet)

Fixed. I was feeling guilty so I ran it through the optimizer in
4NEC2. I haven't built a 5 dipole AMOS yet using these dimensions.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Nov 23, 7:39*pm, Jeff Liebermann wrote:
On Sun, 23 Nov 2008 15:32:02 -0800, Jeff Liebermann
wrote:

NEC2 model:
http://802.11junk.com/jeffl/antennas/AMOS-7/
http://802.11junk.com/jeffl/antennas/AMOS-5/ *(not optimized yet)

Fixed. *I was feeling guilty so I ran it through the optimizer in
4NEC2. *I haven't built a 5 dipole AMOS yet using these dimensions.

--
Jeff Liebermann * *
150 Felker St #D * *http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann * * AE6KS * *831-336-2558

I put one up I use with a WiFi repeater and I can see dozens of
wirless routers in my neighborhood. The antena i mounted at about
20ft on my chimney. There are about 8 or 9 with no security. If I so
chose I would never have to pay for internet service. There is another
subdivsion behind my house I havent even looked at that one yet.
Strange thing I know 3 of the people who have the open systems and
they are farly savy about these things. I wonder if they are leaving
them open on purpose.

Jimmie

On Nov 21, 1:38*am, DaveC wrote:
Looking for outdoor omni "whip" antenna for 2.4 GHz.

Is there any reason to not go for the greatest gain antenna, given that cost
is not too important (within reason)?

There are scads of these on the 'net. I'm looking for someone who has
experience with one or more of them and can make a recommendation for one..

Higher gain omni has flatter /narrower beam. So it has to be pointed
more accurately, tilting as needed to connect with desired AP.

As Jeff says, there's no reason to use an omni for a client. Get a
much cheaper directional antenna and you will get more gain with less
interference. Pointing will be easier too.

Take a look at the pattern for this one:
http://pnt.zoovy.com/product/MD24-12...l_Antenna.html

Or consider a combination weatherproof box with built in panel antenna
like this: http://tinyurl.com/5kfd42
(Choose the version that has the pigtail you need)

That's the first thing you want to determine, by the way, how much
gain is needed? Another thread....


Steve

In article
,
seaweedsl wrote:

On Nov 21, 1:38*am, DaveC wrote:
Looking for outdoor omni "whip" antenna for 2.4 GHz.

Is there any reason to not go for the greatest gain antenna, given that cost
is not too important (within reason)?

There are scads of these on the 'net. I'm looking for someone who has
experience with one or more of them and can make a recommendation for one.

Higher gain omni has flatter /narrower beam. So it has to be pointed
more accurately, tilting as needed to connect with desired AP.

As Jeff says, there's no reason to use an omni for a client. Get a
much cheaper directional antenna and you will get more gain with less
interference. Pointing will be easier too.

Take a look at the pattern for this one:
http://pnt.zoovy.com/product/MD24-12...l_Antenna.html

Or consider a combination weatherproof box with built in panel antenna
like this: http://tinyurl.com/5kfd42
(Choose the version that has the pigtail you need)

That's the first thing you want to determine, by the way, how much
gain is needed? Another thread....


Steve

There are outfits that make Omni Antennas for the 2.4 Ghz Band, that
have Down-tilt designed into them. This helps deal with the flattening
of the Vertical Polarization for local connections. I have one located
on a 60ft Tower that has multiple AP's at various Azimuths, with ranges
out to 2 miles. Works well for a Central Distribution.

--
Bruce in alaska
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