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<div class="moz-cite-prefix">Sorry to come late to the party, one
thought I had was a mesh system using multiple AP's and or the
robots themselves for repeating the signal. Just a thought.<br>
<br>
BTW, Love that part of PA, grew up near there and used to go to
West Point Park (now gone and part of a housing development)<br>
<br>
Bill<br>
<br>
On 10/26/2018 2:26 PM, Charles West via TriEmbed wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGojqS=3mBFcOsU=y4XkWg74Af5JW4=p1xbusx1ah7mRnX0jUw@mail.gmail.com">
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<div>Thank you guys so much. This is a number of viable ways to
solve the problem and I think I can be much more confident in
how I am going to approach this.</div>
<div><br>
</div>
<div>Thanks again,</div>
<div>Charlie<br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Oct 25, 2018 at 7:13 PM, Rodney
Radford <span dir="ltr"><<a
href="mailto:ncgadgetry@gmail.com" target="_blank"
moz-do-not-send="true">ncgadgetry@gmail.com</a>></span>
wrote:<br>
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<div>A distance of 1km is not that far and can be easily
achieved with off the shelf WiFi systems. I am currently
working on a project that has an Ubiquiti M2HP radio
attached as the base system mounted at the top of a
building with an omnidirectional antenna, and the same
radio with a smaller omnidirectional antenna mounted on
the mobile unit and we can easily get that distance.</div>
<div><br>
</div>
<div>The previous solutions are good, but to me, WiFi that
just works out of the box is a simple solution.</div>
<div><br>
</div>
<div>As for my balloon communications, I had a 2-meter
radio in the ham band, broadcasting at about 2W and was
able to get 100+ miles, but that small antenna was up in
the air over 15-20 miles high. I also tried using WiFi
with a parabolic dish on the ground and I was able to
test that out to over 2 miles on the ground, but that is
a directional antenna - not very good for your setup.</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div>
<div class="h5">
<div dir="ltr">On Thu, Oct 25, 2018 at 3:23 PM Charles
West via TriEmbed <<a
href="mailto:triembed@triembed.org"
target="_blank" moz-do-not-send="true">triembed@triembed.org</a>>
wrote:<br>
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<div class="h5">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Hello!</div>
<div><br>
</div>
<div>I'm in Lansdale, PA now but I was
hoping I might be able to pick you guy's
brains. My current big project is trying
to build one or more robots to deliver
food/drinks on golf courses. I'm
currently trying to figure out the best
way to maintain continuous(ish) contact
between a access point/basestation at it's
base of operations and 1 or more robots
operating on the course.</div>
<div><br>
</div>
<div>At a minimum, I would like to have the
robot report its basic status (battery
percent, GPS position) but it would also
be great if it could stream video when
required to allow teleprescence steering
or determination of what is going on. The
robot would probably be about 1 km from
the base station at max. <br>
</div>
<div><br>
</div>
<div>I'm currently considering 3 possible
solutions but I'm pretty open to ideas:</div>
<div><br>
</div>
<div>1. Use a mobile hotspot/cell modem:<br>
</div>
<div> For fixed $130 and monthly $20,
I can get a mobile hotspot which provides
one gig of data per month and more data
for $5/gig. If I keep the reporting
really light, this could work but the
communication would have to be kept pretty
limited.</div>
<div><br>
</div>
<div>2. XBee:</div>
<div> These modules seem to float
somewhere between $25 and $60 in prices,
so a pair would be somewhere in the $50 to
$120 range. Sparkfun had a good guide to
XBee (<a
href="https://www.sparkfun.com/pages/xbee_guide"
target="_blank" moz-do-not-send="true">https://www.sparkfun.com/<wbr>pages/xbee_guide</a>)
but they are listing almost all of their
products as retired (besides old series 1)
and most of the stuff I read about XBee is
from 2015-2016 so I am not sure what the
best options are anymore. In any case, it
looks like it would provide a low baud
rate connection over the desired range.
The main problem is that it requires
working through XBee and making my
basestation have to have special software
to forward information. I'm also not sure
about security and it is certainly not
going to be streaming video.</div>
<div><br>
</div>
<div>3. Long range Wifi:</div>
<div> Rodney's done some work in this
area before with his weather balloon
projects. I don't recall off the top of
my head how far he managed to get but I do
remember he had to use higher power than
allowed without a higher grade amateur
radio license. That power level would not
work for a commercial operation. There
are some companies that are selling
solutions aimed at farms (<a
href="http://ayrstone.com/www/?v=7516fd43adaa"
target="_blank" moz-do-not-send="true">http://ayrstone.com/www/?v=<wbr>7516fd43adaa</a>)
and there seem to be off the shelf
solutions that can get 500 ft (mostly
aimed at hotels). The hotel systems seem
to be in the $350 range and the farm
systems in the $500 or so. The robot
could use a high gain antenna, but it is
not clear how much it helps. These
systems have security built in and
potentially can stream video if the range
is long enough. Like hotspots, writing
software for them would also be easy. <br>
</div>
<div><br>
</div>
<div>What do you guys think?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Charlie<br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
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