[amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ

[Greg D.]

Hi Roger,

The Pringles Can antennas are linearly polarized along the line of the "probe" stuck in at the bottom.  It's actually a 1/4 wave feed.  

Years ago I took a 7 turn helix and a co-worker's Pringles can out to the courtyard at work, aiming back into the building just to see how vulnerable a building's Wi-Fi signal is.  The helix clearly out performed the Pringles, and I found that the Pringles was very susceptible to how it was rotated (as expected).  But, "vertical" wasn't quite where I expected it.  Rather it was some 15 or 20 degrees off.  I have no idea if the Access Point was mounted at an angle, or if it was some other effect.

And, yes, I could clearly receive the network traffic.

Greg  KO6TH


> From: rogerkola at aol.com
> To: amsat-bb at amsat.org
> Date: Sat, 16 May 2009 17:27:25 -0400
> Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
> 
> Not that they were optimum tuned for the 2.5 GHz frequency but what polarity
> were the "Pringles Can" washer antennas that were so popular for
> Net-Stumbling a few years ago?
> 
> Roger
> WA1KAT
> ----- Original Message -----
> From: "Greg D." <ko6th_greg at hotmail.com>
> To: <lucleblanc6 at videotron.ca>; <amsat-bb at amsat.org>
> Sent: Saturday, May 16, 2009 2:33 PM
> Subject: [amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
> 
> 
> 
> Hi Luc,
> 
> 
> >
> > Conclusion don't jump too fast on some hamfest deal as what's good for
> WiFI is not always so good at 2.4ghz!
> >
> 
> This was probably just a typo; if so, pardon the reply...
> 
> 
> 
> Wi-Fi and Wi-Max are different things.  An antenna designed for Wi-Max
> may not operate very well, as you describe, on 2.4 ghz.  Wi-Fi's
> 802.11b/g is on 2.4 ghz (channel 1 is right on top of our allocation),
> so a properly designed Wi-Fi antenna could be good for 13cm Ham
> applications.
> 
> >
> > P.S. I can use the antenna on 2.4ghz and i got fairly
> good signal from AO-51 when he's in S mode but i cannot get rid out of
> the fades.
> > Could be i found why?
> >
> 
> Pretty much every Wi-Fi antenna I've ever seen is linearly polarized.  The
> "diversity" antennas are two separate antennas, usually one vertical and one
> horizontal, with separate cables going to two radios.  Going circular would
> seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only
> seen one vendor do it.
> 
> Enjoy the new toy,
> 
> Greg  KO6TH
> 
> 
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