Long range 115200 bits/sec or faster wireless comm

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Do you know any long range wireless communication gadget (radio modem etc.)
that can be used for 115200 bits/sec continuous data transfer over 100 km  ?

(Imagine you are on a boat/ship and you have a UAV.  You want to fly your
UAV to 100km away and you want continuous comm with the UAV. Because one end
of the communication is an small airplane the smaller size and lighter
weight for the gadget are peferred.)



Re: Long range 115200 bits/sec or faster wireless comm


pretty basic really, the question you need to ask is the device going to
be beyond the radio horizion.
if so then it gets tricky

<Giatto Cardiacci> wrote in message
: Do you know any long range wireless communication gadget (radio modem
etc.)
: that can be used for 115200 bits/sec continuous data transfer over 100
km  ?
:
: (Imagine you are on a boat/ship and you have a UAV.  You want to fly
your
: UAV to 100km away and you want continuous comm with the UAV. Because
one end
: of the communication is an small airplane the smaller size and lighter
: weight for the gadget are peferred.)
:
:


Re: Long range 115200 bits/sec or faster wireless comm


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Have a look at http://www.elprotech.com but the range is 20-30 km under
good conditions

Re: Long range 115200 bits/sec or faster wireless comm



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62 mile radius? Over 12 thousand square mile area? That's tricky, very
tricky, 115kbs sort of fast, but maybe not unmanagably fast.
What are weight requirements?
What are budget constraints?
Can you maintain "line of sight?"
Can you prepare the site, i.e. lay down repeaters?
Will you be near cellphone towers?
What about satalite internet?

If you don't mind me asking, what for? It sounds like you have a very
specific application in mind, and to be honest, I can't think of any really
legitimate use. Sure, you may be able to do it, but I can't see any hobby
use, and if it were a corporate or military project you wouldn't be asking
so publically. Maybe I'm paranoid, but a remote control plane with a 62
mile range could be a poor man's cruise missile.

Re: Long range 115200 bits/sec or faster wireless comm



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Life is like that.

Legitimate hobby and commercial technology can be turned
into weaponry (think fertilizer being turned into a bomb
in Oklahoma).

I hope the guy is legit, and, if he is, that he finds the
answer to his questions.

If not, I hope the good guys find him before he launches
his RPV.  :o)

Japanese companies developed an RC helicopter for
spraying under GPS guidance years ago.  Aersonde
has shown how to fly an RPV across the oceans at
a relatively low cost ($25,000 per vehicle a few years
back).  Maynard Hill figured out how to do the same with
an 11-pound model (wet!).

r.m.rc.air isn't going to stem the tide of technological
development of RC equipment, for good or for ill.
We don't have a monopoly on the information that
makes these systems tick.

                    Marty

Re: Long range 115200 bits/sec or faster wireless comm



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Unfortunatelly most of us are programmed by the mass media to think
pesimisticly.
Yes you may be right that a UAV with  100km range would be dangerous on
wrong hands.
But was thinking differently.
Application I had in mind was monitoring the very large disaster areas.
As we all learned that, unfortunate tsunami and recent earthquake can and
did change the region's maps.
Boats ships could not use their pre-disaster maine maps to navigate around
islands.
Human operated helicopters and airplanes are used for both for monitoring
and for aid delivery.
I think it may be possible to use long range UAVs in such humanitarian
applications.



Re: Long range 115200 bits/sec or faster wireless comm


Quoted text here. Click to load it

Unfortunatelly most of us are programmed by the mass media to think
pesimisticly.
Yes you may be right that a UAV with  100km range would be dangerous on
wrong hands.
But was thinking differently.
Application I had in mind was monitoring the very large disaster areas.
As we all learned that, unfortunate tsunami and recent earthquake can and
did change the region's maps.
Boats ships could not use their pre-disaster maine maps to navigate around
islands.
Human operated helicopters and airplanes are used for both for monitoring
and for aid delivery.
I think it may be possible to use long range UAVs in such humanitarian
applications.



Re: Long range 115200 bits/sec or faster wireless comm


Quoted text here. Click to load it

Unfortunatelly most of us are programmed by the mass media to think
pesimisticly.
Yes you may be right that a UAV with  100km range would be dangerous on
wrong hands.
But was thinking differently.
Application I had in mind was monitoring the very large disaster areas.
As we all learned that, unfortunate tsunami and recent earthquake can and
did change the region's maps.
Boats ships could not use their pre-disaster maine maps to navigate around
islands.
Human operated helicopters and airplanes are used for both for monitoring
and for aid delivery.
I think it may be possible to use long range UAVs in such humanitarian
applications.



Re: Long range 115200 bits/sec or faster wireless comm



<Giatto Cardiacci> wrote in message
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etc.)
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?

Try asking the people who flew a model plane over the Atlantic!.... They had
telemetry on it of some sort.

http://www.modelaircraft.org/mag/1103/president.htm

http://tam.plannet21.com /




Re: Long range 115200 bits/sec or faster wireless comm


SatCom!  Just like the big boys do it!


<Giatto Cardiacci> wrote in message
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Re: Long range 115200 bits/sec or faster wireless comm


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If your budget is not so limited,or just to learn some more about what
you are trying to do, go to http:\ipmobilenetinc.com and then look into
their VHF systems. They can't do your 115200, but you should see what
all they can do with 19.2.

The biggest reason you can't get the speed out of the lower bands is
that the FCC and other governing bodies will not let you use the
bandwidth necessary.

To get any real speed out of a radio signal you have to move up into the
microwave range and then use some very nasty tracking algorithms to keep
your antennas aligned. In other words not happening.

IPMobileNET's diversity system is something you should look into
implementing, since it allows them to run the radios at lower power and
reception levels and to take advantage of signal bounce more
effectively. That mostly helps inside large cityscapes.

For open ocean and at the distances you are referring to, you are
probably going to have to drop back into the HF frequencies, or at least
VHF, but at high wattages and some expensive antennas. I hope you have a
large ship and UAV to work with.

The military uses satellites for its missile systems and or runs them
antonymous.

You are asking for a lot out of an all digital system is what I'm trying
to say.

I have to agree with the person who mentioned passing analog data
instead of digital. Lower your baud rate and send smaller packets. Send
your video back as an analog using a separate camera system from your
vision system as it will give more detail than your vision cameras will
anyway. Any other data I can think of you collecting will not take up
any where near the packet space except the sonar data and only if you
are trying to put together the composite picture on board the UAV
itself. That could turn into a real processor hog and would be done
better by ship board sonar mapping.

Just how much data are you trying to collect any way. Give us an idea
and we could probably help you better. The company I work for built the
Navy an ROV aircraft way back in the late 70's early 80's. I would like
to see more about this idea. I think it could be useful if it hasn't
already been done.

Eljin

Re: Long range 115200 bits/sec or faster wireless comm



| Do you know any long range wireless communication gadget (radio modem etc.)
| that can be used for 115200 bits/sec continuous data transfer over 100 km  ?

Yes, radio modems do exist that can do 115 kbit/s.  And radios do
exist that can work across 60 miles, though that's generally more than
line of sight unless you have a tall tower for an antenna, though if
your plane has considerable altitude that'll help.

However, to get that sort of range, especially with it being that
close to the maximum line of sight, you'll need either a reasonable
amount of power, and/or good directional antennas.  Both will be
difficult to set up on a standard sized model plane.

Also, you'll either need some dedicated bandwidth, or a ham license.
The former will be difficult for an individual to get.  The latter is
pretty easy to get, but it limits what you can do with the link.

You could use the 900, 2400 or 5800 mHz bands, which are available for
use without a license, and cheap equipment exists that will give you
much better than 115 kbit/s connections over that, but the power
limits are so low that you won't even get a single mile of range
without great effort.

Another option is a satellite link, which is what the TAM team did
when they crossed the Atlantic -- though their plane was autonomous
except for takeoff and landing, and I'm sure the data rate was MUCH
less than 115 kbit/s.  You could also use standard cell phones with
data services if you're flying over areas with cell phone service.
Might not work if your purpose really is emergency use, however --
emergencies tend to take out cell phone service.

| (Imagine you are on a boat/ship and you have a UAV.  You want to fly
| your UAV to 100km away and you want continuous comm with the
| UAV. Because one end of the communication is an small airplane the
| smaller size and lighter weight for the gadget are peferred.)

Lots of people have experimented with this sort of thing with various
budgets and various degrees of success.  Google will probably find you
lots of stuff.

--
Doug McLaren, snipped-for-privacy@frenzy.com
"I believe we are on an irreversible trend toward more freedom and
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Re: Long range 115200 bits/sec or faster wireless comm



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You might want to have a look at this website detailing the engineering that
went into
the building and flying of a high altitude autonomous glider.

http://members.shaw.ca/sonde/index.htm


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