All the new corn uses GPS sync to prevent that...
From: Ken Hohhof
Sent: Saturday, July 04, 2015 8:07 PM
To: af@afmug.com
Subject: Re: [AFMUG] see crops grow on signal graph
That’s crazy. If tassels are way out of sync with silk, the ears won’t get
pollinated.
From: Erich Kaiser
Sent: Saturday, July 04, 2015 8:09 PM
To: af@afmug.com
Subject: Re: [AFMUG] see crops grow on signal graph
Saw first field around here tasseling(no not sweet corn), crazy for this area
and 4th of July...
Erich Kaiser
North Central Tower
er...@northcentraltower.com
Office: 630-621-4804
Cell: 630-777-9291
On Sat, Jul 4, 2015 at 3:58 PM, Ken Hohhof <af...@kwisp.com> wrote:
This isn’t corn blocking LOS, it is multipath due to reflections. We get
peaks and valleys >20dB variation and unfortunately they move as the crops
grow. I used to think going higher was the answer, our typical install height
is 15 feet AGL, but even at 25+ feet we see this. In many cases we get better
results going lower, if we can get below the last null. At the point marked
“A” on the graph we lowered the dish at the customer end, but there was another
null below it and as the corn grew the null moved up.
Best situation is a hill, ridge, or line of trees in the distance so there is
no reflected path.
We’ve had a lot of rain this June so there’s a lot of moisture in the crops.
Usually things get a little better when the soybeans turn brown or the corn
tassels out and starts to dry up.
From: Work
Sent: Saturday, July 04, 2015 3:15 PM
To: af@afmug.com
Cc: af@afmug.com
Subject: Re: [AFMUG] see crops grow on signal graph
If install by farm scope 9ft or higher if it only works lower then that don't
install it
—
Sent from Mailbox
On Sat, Jul 4, 2015 at 3:41 PM, Ken Hohhof <af...@kwisp.com> wrote:
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.
<crops_growing.png>
<crops_growing.png>
