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VK3JMA > WIFI 28.03.04 06:20l 52 Lines 2150 Bytes #999 (0) @ WW
BID : B90293VK3JMA
Read: GUEST DK5RAS DO6NP
Subj: Re: WiFi comments please!
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<ZL2BAU<VK6HGR<VK3AYM<VK3DSE
Sent: 040328/0137Z @:VK3DSE.#MEL.VIC.AUS.OC #:9653 [Narre Warren] FBB7.00g25
From: VK3JMA@VK3DSE.#MEL.VIC.AUS.OC
To : WIFI@WW
Hi Paul & Others,
N7OO wrote:-
> I've been using MMDS clamshell antennas on my system for about a year now.
> These are foldable elements that when opened form a half parabola and are
> about 20 dBi gain. Am using Linksys WAP11's on a 1 mile link. Short 300
> ft link is using a Linksys PCI wireless card feeding 15 ft of RG-8 to a
> clamshell in the attic thence to a Netgear attachment point out at the
> nodeshack. The PC in the nodeshack acts as the router for the network.
Whew!!!! RG-8?????? big losses at 2.4. Look for some heliax at least.
I ran LDF550 up 8m to the 24dbi dish from my DWL-650 PCMCIA card and
managed -90 dbm over a 7.5 Km path, then when I moved my DWL-900AP+ access
point to the top of the tower and fed it straight into the dish with only
about 1/2 m of coax, signals increased to -72 dbm. Even the LDF550 heliax
coax was lossy at 2.4 GHz.
My suggestion to anyone comtemplating a 802.11b/g system over distance is
to but a ethernet type access point DWL900AP+, SVEV, Minitar etc, and mast
mount it atthe dish. My personal favorite at the moment is the minitar
(www.minitar.com) 802.11b access point, these can run Access point, Access
point client, bridge, repeater and WDS modes and have a +18dbm output
(typ.) which is around 60 mW, more than enough to establish my 7.5 Km 2
mbit/s path to vk3yy. We dp ftp/nntp/http/pop3/smtp/video etc as well as
mapping each others drives just like accross any network.
5.5 mbits has been acheived bit was not consistant so we locked it down to
2 mbit/s which is better than any adsl and many many times better than
ax25 packet. As we even further refine our link the higher speeds will
become more and more efficient and we can lock them in instead of the
lower 2 mbit/s. Although the -72 dbm should have been enough to establish
a steady 11 mbit/s, there where always other circumstances like moisture
in the air, trees close by, murphy, etc that would make the link drop out
atthese speeds.
73
mark
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73 - Mark, VK3JMA
email: vk3jma@net2000.com.au
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