The actual units used in our link were a pair of DWL-1000AP+ in bridge mode
with ANT24-801 outdoor patch antennas. The DWL-1000AP+ has a rated power
output of 50mw (17dBm) and the patch antennas are rated at 8.5dBi gain each.
No doubt other antenna with higher gain such as the ANT24-1801 with 18 dBi
gain would give quite a high margin to work with if necessary. The majority
of commonly available WiFi devices are usually rated at 30mw which is only a
dB or so down from the 50mw of the units we used. We did reduce the power
levels considerably anyway.
It may be worthwhile to check antenna polarization when shooting over water
or any longer distances. Sometimes it can make a difference but often this
can only be found out at installation time and will vary from installation
to installation.
Maybe the best thing to do would be using a couple of cheap adaptors with
some good antennas in an Ad Hoc mode and go from there. Go to
http://homepages.ihug.co.nz/~redwood4/ and its references for some
practical ideas.
Pierre
"Rôgêr" <(E-Mail Removed)> wrote in message
news:1bKdnZx8A4zyZGbfRVn-(E-Mail Removed)...
> Student Alpha wrote:
> > Roger,
> >
> > I've seen a couple posts about Tranzeo and have looked at their
> > website.. Only it's hard for me to figure our from their literature
> > what distances any particular AP or bridge can do. Maybe I'm just
> > missing it somewhere. Although I know LOS (line of sight) can effect
> > distance quite a bit.
>
> More than quite a bit. That's why they don't list distances. How can
> they guarantee a distance when they have no idea what kind of
> environment you're going to use them in?
>
> > My other question, and maybe I just need to contact Tranzeo, is whether
> > or not they can support PPTP connections. They mention TCP/IP and IPX
> > but in order to initiate PPTP connection it has to be able to send GRE
> > packets. If you know this information, I think it would be helpfiul.
> > The only other downside I see to these Tranzeo is that most of them
> > only support WEP and not WPA...
> >
> > Pierre,
> >
> > Thanks for the information.. Although with model or more detailed
> > information (Antenna dbi, power output) it's hard to tell just which
> > models will get me the 1500 without any problems.
>
> This info was listed in the ad for the AP:
> Transmit Power: +28dBm EIRP
> Receiver Sensitivity: -92 dBm (1 Mbps) / -85 dBm (11 Mbps) @ <0.08 PER
> Antenna: 15dB Panel
>
> This was listed for the CPE:
> Transmit Power: +31dBm EIRP
> Receiver Sensitivity: -82dBm @ 11Mbps
> Antenna: 15dB Panel
>
> There's further information available on Tranzeo's website. I'm not
> going to try to sell them to you, I don't have a dog in that fight. Some
> of their models state they support PPTP, some don't mention it so I'd
> assume they don't. All of their outdoor gear is made to cover distances
> of several miles, 1500 feet is falling off a log, drop dead easy. And
> yes, the models I suggested are 802.11b so no WPA. There are some
> outdoor 802.11g outdoor pieces of equipment coming on the market from
> differnt mfgs but most that I've seen so far are more expensive.
>
> I live about 1,300 feet from my office and I have a 8dbi omni on the
> roof of my office and I have a 6dbi panel antenna just sitting on my
> porch, not screwed down and not carefully aimed and I get near 100% link
> quality and signal strength. Without reaiming it, I can connect to
> another of my APs another mile and a half further away (it has a 15dbi
> sector if I remember correctly) and get the full speed of my T1 line.
> This is with smartBridges equipment which is very similar to Tranzeo.
>
> If you need a load of numbers, perhaps Jeff will happen along and
> explain. I just know it works for me.