Talk:Cantenna

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Secret service[edit]

"Even the Secret Service has taken an interest in the cantenna." Can we get a source for this?

splintax (talk) 12:51, 6 October 2005 (UTC)

Can we get a photo?[edit]

Please? Prometheus-X303- 23:37, 8 October 2006 (UTC)

Spider Omni[edit]

And what does "more potent" mean with regard to antennas? Certainly not dB gain. A cantenna can have up to 24 dB gain, while an omnidirectional unipole is what 3 or 4? Remove that nonsense. Spike2021 (talk) 03:45, 8 May 2008 (UTC)

Legality[edit]

I know that I am an unregistered user, so fogive me, but should there be a section on the 'Legality of Cantennae' somewhere in the article?

I remember reading about how the FCC doesn't like the amplification of signals that people are doing at home. 130.20.74.174 23:57, 20 September 2006 (UTC)

Amplification via antenna-only, to some extent, is still legal under FCC part 15 as long as certain limits are not reached. 147.145.40.44 22:52, 25 January 2007 (UTC)

The FCC doesn't exactly like homebrew antennas IIRC, not specifically the amplification. T3h 10:12, 24 March 2007 (UTC)

  • Then their are a lot of "roll their own" hams that are in trouble. You mind showing me the applicable FCC part? I've been building antennae since I was 8, and I've only had to talk to FCC enforcement 1 time in all these years (and it turns out I was very legal under part 15, which typical cantenna equipment falls under) 66.28.178.68 21:57, 11 September 2007 (UTC)


"They're unsophisticated but reliable, and it's illegal to possess them," said Lozito of the Hi-Tech Crimes Task Force.

http://www.boingboing.net/2005/07/26/hitech-cop-cantennas.html

http://seclists.org/isn/2005/Jul/0098.htmlOmegatron 07:29, 3 September 2007 (UTC)

  • The quote is taken out of context in the boingboing article. 66.28.178.68 21:57, 11 September 2007 (UTC)

other[edit]

A comparison to http://en.wikipedia.org/wiki/Parabolic_reflector would be nice. —Preceding unsigned comment added by 68.229.179.194 (talk) 16:01, August 30, 2007 (UTC)

There are some off-wiki pages that try to summarize the performance differences of lots of different antennas: [1] [2] Is that what you were suggesting? I'm not sure what a parabolic antenna has in common with a cantenna other than that they're two designs that work well for wifi frequencies. --Underpants 16:45, 1 March 2009 (UTC)

Waveguide vs. yagi[edit]

Perhaps the article could make a clearer distinction between the two most popular types of antennas that the term "cantenna" is applied to? The article does note that waveguides are the most common, and that yagis/omnis/sector/etc antennas are possible. But it seems like the "Pringles cantenna" is the second-most popular, and is almost always a yagi (with washers put at specific intervals down a threaded bolt that runs down the center of the cantenna).

If this is an accurate description, it might be good to include it. I mention this because when I first started learning about cantennas, most of the popular-press mentions I'd heard of referred to the Pringles cantenna, and Pringles cantennas aren't really the right dimensions to make a waveguide antenna, and for a while I (mistakenly) thought that Pringles cantennas were the most common version. --Underpants 16:45, 1 March 2009 (UTC)

Split[edit]

71.167.66.118, please justify the need for a split, or your assertion "Origin of the name: that's not the same thing". A lack of discussion will result in the removal of the {{split}} template.

I see no need for an article on the Heath 'Cantenna. It's just a dummy load; how much is there to say about it? --Jc3s5h (talk) 18:23, 11 October 2009 (UTC)

External links[edit]

"Cantenna calculator" must be changed to "Cantenna calculator (2.4 GHz)" --lgoncalv 11 October 2009 —Preceding undated comment added 03:19, 18 October 2009 (UTC).

Needs some sort of design equations.[edit]

I've been thinkign about building one of these, and how to do it optimally is far from best. For example, if the can is too small in diameter, it would act as a "waveguide beyond cutoff" and signals would propogate down in with very high loss. If the diameter is too large, various modes would be set up, and that likely to cause problems. Should the diamater be such that the antenna works in the fundamental mode of the waveguide?

How far from the feed be from the back or front? How long should the feed be?

Whilst not knowing the answers to these questions, as a profeesional (chartered) engineer, who specialises in RF, I think these are important questions. I think to make one properly, take a lot more than taking a random size bean can and poking a wire in at some random location and some random length.

Other important questions would be about the gain. The article states " The typical gain for this kind of antenna in the 2.4 GHz Wi-Fi band is about 10 dB.", but without a reference (usually dBi or dBd), that is a useless statemant. It is a bit like a newpaper sstating the temperature is expected to be 10 degrees. Without clarifying if it is Centigrate or Farenheight, it is a useless statement.

It is in my opinion, a rather poor article, written by people who don't know the subject, but deceide they can contribute something. Drkirkby (talk) 10:23, 12 January 2014 (UTC)