20db Cantenna?

biggus · 03-10-2003

While cruising the postings on ebay I found listings for a cantenna called "cAntenna III". The listing states the cantenna good for 18-20db. This exceeds all the tested designs I've found through a bunch wireless links.

I don't claim to have checked every listing on the web, just a few days worth of surfing.

Is this realistic for a cantenna? Most of the tests I've found for cantennas show 10-17db designs.

His links show a short range test of around 1300 feet.

agentgrn · 03-10-2003

I'd be a little skeptical of that gain...that's starting to creep into parabolic reflector territory...something you're not likely going to get out of any kind of cantenna.

It _could_ be possible if the antenna is precisely constructed and properly tuned, but I have to play the skeptic on this one.

Eyecannon · 03-10-2003

I don't think it would be impossible, a quick cantenna I made does 14-15db gain at 100'.

agentgrn · 03-11-2003

The mention of it does have be a bit curious, I'll admit. My soon-to-be father inlaw is a machinist, so I'm thinking of asking if he can make some parts for me.

I haven't done any directional work just yet...doesn't suit my wardriving style. I do, however, have another wireless project slated for April that will need a directional...and it might be a good time to start tinkering with antennas.

Eyecannon · 03-11-2003

Quote:

Originally posted by agentgrn
The mention of it does have be a bit curious, I'll admit. My soon-to-be father inlaw is a machinist, so I'm thinking of asking if he can make some parts for me.

I haven't done any directional work just yet...doesn't suit my wardriving style. I do, however, have another wireless project slated for April that will need a directional...and it might be a good time to start tinkering with antennas.

Ever since I started making cantennas, I haven't gone back to my omni

agentgrn · 03-11-2003

What I've got on the docket for April is some (c)antenna experimentation and range testing and such. One of the local malls here has an incredibly huge parking lot which I think I can use for range testing if I run it long enough.

There's a section along I-290 in the median that is frequently used by surveyors, presumably to calibrate their equipment...and I've considered using that stretch too...when the weather warms up to do some open-air range testing.

TheSovereign · 03-12-2003

so far without getting into yagi's the best direction stuff i seen are the bi-quads and bi-octs
just to screw around i put a bi-quad 1.25 inches from the back of a folgers can of coffee (the really big one) and man it rox
i had to experiment moving it back and forth until tuned right
im using it now
i got 2 of them on a couple linksys wets running in adhoc mode to eachother to bridge a lan to me from my church so they can get internet

03-10-2003	#1 (permalink)
biggus Registered Member Join Date: Mar 2003 Posts: 5	20db Cantenna? While cruising the postings on ebay I found listings for a cantenna called "cAntenna III". The listing states the cantenna good for 18-20db. This exceeds all the tested designs I've found through a bunch wireless links. I don't claim to have checked every listing on the web, just a few days worth of surfing. Is this realistic for a cantenna? Most of the tests I've found for cantennas show 10-17db designs. His links show a short range test of around 1300 feet.

03-10-2003	#2 (permalink)
agentgrn KB1JQO - Packin' Heat Join Date: May 2002 Location: Worcester, MA Posts: 517	I'd be a little skeptical of that gain...that's starting to creep into parabolic reflector territory...something you're not likely going to get out of any kind of cantenna. It _could_ be possible if the antenna is precisely constructed and properly tuned, but I have to play the skeptic on this one. __________________ -A.G.-

03-10-2003	#3 (permalink)
Eyecannon Ward River Join Date: Aug 2002 Location: Santa Monix Posts: 679	I don't think it would be impossible, a quick cantenna I made does 14-15db gain at 100'. __________________ No, officer, YOU are under arrest! http://eyecannon.com/wardrive.html

03-11-2003	#4 (permalink)
agentgrn KB1JQO - Packin' Heat Join Date: May 2002 Location: Worcester, MA Posts: 517	The mention of it does have be a bit curious, I'll admit. My soon-to-be father inlaw is a machinist, so I'm thinking of asking if he can make some parts for me. I haven't done any directional work just yet...doesn't suit my wardriving style. I do, however, have another wireless project slated for April that will need a directional...and it might be a good time to start tinkering with antennas. __________________ -A.G.-

03-11-2003	#6 (permalink)
agentgrn KB1JQO - Packin' Heat Join Date: May 2002 Location: Worcester, MA Posts: 517	What I've got on the docket for April is some (c)antenna experimentation and range testing and such. One of the local malls here has an incredibly huge parking lot which I think I can use for range testing if I run it long enough. There's a section along I-290 in the median that is frequently used by surveyors, presumably to calibrate their equipment...and I've considered using that stretch too...when the weather warms up to do some open-air range testing. __________________ -A.G.-

03-12-2003	#7 (permalink)
TheSovereign Master of the universe Join Date: Jun 2002 Location: chicago Posts: 658	so far without getting into yagi's the best direction stuff i seen are the bi-quads and bi-octs just to screw around i put a bi-quad 1.25 inches from the back of a folgers can of coffee (the really big one) and man it rox i had to experiment moving it back and forth until tuned right im using it now i got 2 of them on a couple linksys wets running in adhoc mode to eachother to bridge a lan to me from my church so they can get internet __________________ SO SAYS TheSovereign Last edited by TheSovereign : 03-12-2003 at 12:35 AM.

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