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From: dold on 6 Oct 2005 19:55
bjs555 <aaa(a)bbb.com> wrote:
> and a Hawking antenna for $4.99 all after rebates.

On one system, I installed a Hawking antenna on a Netgear WG311, which
has a tiny stock antenna. The "Hawking HAI6SDA Directional 6dBi 2.4GHz
Antenna" http://www.hawkingtech.com/prodSpec.php?ProdID=143 is pointed at a
Linksys BEFW11S4 that has a pair of Windsurfers.

It looks a little more professional than the cantenna. I used to have a
pair of corner reflectors, but I caught grief from the local interior
designer, and Jeff Liebermann, for the wrinkly tin foil.
http://www.rahul.net/dold/clarence/SMC/EZ10-strength.htm

I read some mutterings from Don Widders today (posted in 2003, I wonder
what happened to him), that said that the antenna should be centered in a
corner reflector, because it might have corresponding reflections from
three points, one on each side, and the fold itself. He felt that the
antenna should be off-center a little.

--
---
Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5

From: Jeff Liebermann on 7 Oct 2005 00:28
On Thu, 06 Oct 2005 17:52:29 -0400, bjs555 <aaa(a)bbb.com> wrote:

>I looked up some specs for my radios. The Linksys WMP11 receive
>sensitivity is around -82 dBm and the Zonet ZEW2501 is about -85 dBm.

At what connection speed and what type of modulation (CCK or OFDM)?
The sensitivity varies with the connection speed and modulation type.
If you're going to compare sensitivities, it has to be at the same
speed and modulation type.

>I take it this means I need 6.31 uW to get a signal into the Linksys
>and only 3.16 uW for the Zonet. Does that sound right? I think there's
>probably some variation these is in these specs from unit to unit but
>the lower Linksys sensitivity could explain what I see.

The variations from just the test equipment and test setup is at least
+/- 3dB. There's also some creativity in whether to use the US 10E5
BER (bit error rate) reference, or the ISO 10E6 BER. Also there are
some that measure BER or PER (packet error rate).

The data sheet numbers for the complete radio is often exactly the
same as that for the chipset data sheet. Well, that's impossible
because of all the circuitry between the antenna connector and the
chip. There's the diversity switch, 1 or 2 connectors, a chunk of
coax, and often a matching network.

--
Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
831.336.2558 voice
http://www.LearnByDestroying.com AE6KS
http://802.11junk.com Skype: JeffLiebermann
jeffl(a)comix.santa-cruz.ca.us jeffl(a)cruzio.com

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