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@aol.com To: amsat-bb@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@hotmail.com To: lucleblanc6@videotron.ca; amsat-bb@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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