[AFMUG] see crops grow on signal graph

[Ken Hohhof]

I would almost say the #1 problem we face is reflections off cropland, 
primarily on 5 GHz customer links.  One set of problems occur at sundown 
with no wind.  Another occurs as the crops grow.  And with crop rotation, we 
might have problems at a customer location where we had none the year 
before.

Here is an example where you can literally watch the crops grow day by day 
on the signal graph.  Notice the nice roller coaster shaped graph.

There are a couple other things going on at this location.  At point A we 
moved the customer's antenna 1-2 feet lower, and changed the mount to a pipe 
with one of the KPP brackets that lets us slide it up and down on the pipe. 
Less than a month later, we're in trouble again.  At point B a storm damaged 
the AP omni and the top was open to rain and hornets, it was replaced a 
couple days later.

Strange I don't hear much discussion about this problem, we probably have it 
at 5% of our customers.  Maybe most of you don't have flat land and row 
crops.