I toyed around with this idea last night. I think the angle of view of most
phones is too wide. Doing the rangefinder math for my iPhone 6s a 1 meter dish
at 1 km would be less than 4 pixels across at full resolution (4032x3024). The
5.8 GHz fresnel radius would be 3.6 m or only 52 pixels. Of course, this would
grow larger if calculated closer to the user—even as the fresnel zone
shrank—but I don’t have the calculus chops to figure out the ideal size to
indicate “this area should be clear no matter how far away”
December 18, 2018 8:58 AM, [email protected] (mailto:[email protected]) wrote:
I guess you could run a calibration routine where you take a photo of some
linear feature that exactly fills the frame and tell the phone how far away it
is and how wide it is.
From: Brian Webster
Sent: Monday, December 17, 2018 10:09 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] Fresnel scope?
Right and since you know the frequency and total path distance, if you
used a laser range finder to put the spot on an obstruction you would know that
distance and could calculate the size of the zone at that obstruction distance.
Might be able to do some Pythagorean math on the other side of an obstruction
to determine the width of the “hole” through to see if it is wide enough for
the zone clearance at that distance? This might be a bit too much for an app
that would work on all phones but I wonder if it would be easier to make it
work on an outboard camera with the known lenses and rangefinder configuration
and just use the phone to run the calcs.
Thank You,
Brian Webster
www.wirelessmapping.com (http://www.wirelessmapping.com)
www.Broadband-Mapping.com (javascript:false)
From: AF [mailto:[email protected]
(mailto:[email protected])] On Behalf Of Chuck McCown
Sent: Monday, December 17, 2018 8:40 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Fresnel scope?
I guess you could enter the distance of the link and the camera field
of view. With that you could put some circles on the screen.
From: Jeremy
Sent: Monday, December 17, 2018 6:13 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Fresnel scope?
What about integrating it with one of these laser rangefinders that are
fairly cheap now? The tech exists to make this product work, but I am not sure
if there is a big enough market to justify the R&D.
On Mon, Dec 17, 2018 at 6:12 PM Chuck McCown <[email protected]
(mailto:[email protected])> wrote:
The challenge would be to know the distance to the obstructions.
From: Steve Jones
Sent: Monday, December 17, 2018 6:06 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] Fresnel scope?
Anybody every toyed with making some kind of fresnel scope for
installers?
Like a rangfinder with a red, orange, yellow, and green opaque overlay
that you dial your freq and range and it adjusts the rings?
Having been doing the installers job for almost a year and seeing the
"gap in the trees" theyve been shooting through, explains alot of the
performance issues.
A phone app would be cool cause you could do a field of vision
screenshot. But i dont know how that could be calculated with much accuracy
given the differences in cameras
Would be really cool if the adjustable rings could be used to identify
beneficial obstructions for mitigating destructive multipath.
I cant see the concept being all that complicated, you would know the
magnification, field of vision and distance from the eye. Making the circles
adjust like miltiple irises would be a might bit complicated though.
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