Re: Tranzeo TR-6019f initial semi-review


"Jeff Liebermann" <jeffl@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:i2var1ddsfjo6cicfkt1fcvr6atbo2r8sl@xxxxxxxxxx
> "Ian" <ian_agerskov@xxxxxxxxxxx> hath wroth:
>
> Running the numbers at 11Mbits/sec, I get a fade margin of 36.3dB.
> This more an adequate for a 1.5 mile link.
> http://en.wikibooks.org/wiki/FAQ_for_alt.internet.wireless/Wi-Fi#Link_Calculations
> However, trees are always an issue. Foliage attenuation varies
> radically depending on the size of the leaves, degree of moisture, and
> number of solid branches. How "sparce" are the trees?

I live in Canada. Right now there is no vegetation on the trees, you can see
the other end through the trees. There is one row of trees and once the
vegetation comes back I might not be able to see through them. I ran a test
with linksys stuff in the summer attached to 15dbi antennas and had a
connection, but of course wanted as much margin as possible so thats why I'm
using the Tranzeo 19 dbi units.
>
> Oh-oh. Interference, moving trees, or reflections. Did you test the
> units together at much shorter range to see if there are any problems?
> I usually do that and then cover one antenna with a wet towel to
> simulate a more distant connection.
>
I have checked it on calm days and with no vegetation on the trees I know it
is not a moving tree issue. As far as interference goes we are in a fairly
sparse area but a mile away I do have a 802.11 setup. The tranzeo CPQ picks
it up as a signal 0f -94. There is alot of oil field sacada equip around
running on 400 mhz I think and the ISP here runs aironet equipment on 900
Mhz. I did bench test them but it was more to get familiar with the setup
screens and to configure and test the encryption before installation. To be
honest I do not know if the units were hunting for a connection speed. I
like the wet towel idea.

>Fortunately, the tree has grown considerably in the last few
> years and I can now shoot the beam under the foliage canopy.

At the end with the trees the guy said we can cut down some brances in the
summer if we have to.

> That's what interference from another 802.11 system looks like. The
> link disconnects and then tries to reconnect. Meanwhile, the signal
> strength looks like a light show because it's trying to find a
> suitable speed.
>
> Yep. Also check for local interference with a spectrum analyzer or
> Kismet passive sniffer (because it can also see clients and blank
> SSID's).

> That's usually a big help with interference. It doesn't do much for
> reflections, foliage attentuation, or Fresnel zone problems.

I think I'll try moving the CPQ closer, they are close to where I live the
CPQ is easily accessable and it won't take long to do. Horizontal polarity
wouldn't take very long as well. I'll have to check if the wireless card I
have will work with Kismet - SMC2532W-B. I purchased it because it is 200mw
and can connect to an external antenna. When checking for local interference
is it best to attach an external antenna and do a sweep or just use the card
as is?

> Argh. Methinks the WRT54G v5 is a loser. Be sure that the access
> point and WRT54G are on widely seperated channels.

Yeah I got them the V5 before I knew of the issues with it because I have a
ton of V4's out there working flawlessly. Hopefully the WRT54GL will be
better. Anyone have any comments on it? At any rate it is easy to take it
out of the mix and try transfering files between PC's.

> Any potential 2.4GHz RF sources in between or in line with the
> antennas? Factories using 2.4Ghz microwave drying ovens are always a
> problem.

We are in a very sparsely populated area aprox 1 house every mile or so but
there is one house in a direct line in between at an elevation that should
be below fresnell problems but maybe I'm wrong. I don't think they are
running any equipment but you never know.

>However, this mess sounds
> like continuous lousy connections which reeks of interference, not
> reflections or trees.

If it is interference hopefully horizontal polarity will be the ticket.

> --
> Jeff Liebermann jeffl@xxxxxxxxxxxxxxxxxxxxxx
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for you help Jeff, much appreciated. I'm not in a panic, the
connection seems to be hanging in there fast enough for the internet, but
I'll post back as soon as I get a chance to investigate further.

Ian


.

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