Reflection problem?

We setup a 2.5 mile link using 2 Tranzeo TR-6000 AP's with integrated 15 dbi
in a rural location.

AP 1 18 ft agl
AP 2 24 ft agl

There is one tree partially blocking line of site 75 feet from AP 1.
A couple of buildings at about the half way point that definately come in to
play. Otherwise it is wide open.

So we know this setup has fresnel issues but thought we would give it a try
anyway. When the radios are dialed up to full power 23db the throughput of
the radios is virtually useless. If we dial the power output on AP 1 down
to 18db the link works great. I'm assuming that we are getting a reflection
that is causing a high error rate and reducing the power output reduces the
strength of the reflection.

Is this typical of a reflection problem?
Could the tree be the source of the reflection or does a tree pretty much
only absorb?
Can a reflection off the ground cause this type of behaviour?

This is not a critical must be up connection, so I'll leave it for now since
it has been working good for a month.What are the odds, if nothing else
changes, of this link continuing to function reasonably well?

Any input is much appreciated.

Ian


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