Increasing signal reception

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I'n not sure that the question is clear or not. What I am interested in  
is being able to pick up a WiFi signal that is about 800 ft distant.  
I'd like to be able to do this using a Toshiba Thrive tablet that runs  
Android OS (JellyBean). The current signal strenght is in the -85-
90Dbm, thus it tends to be unstable. There are no physical obstructions  
other than the walls of building where the router is located.  
The router is owned by a business and offers a guest access.

I have a couple of Alfa 1000mw USB adapters and another USB adapter  
that also has the RLT8187 chip set. Of course one impediment is the OS  
which does not recognize the Alfas or apparently have drivers for the  
RLT8187 chipset.

Any suggestions?

--  
Cheers,
Kurt  
  

Re: Increasing signal reception

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Google on "Pringles can antenna".

Isaac

Re: Increasing signal reception

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Thanks, got one. Antennas are part of the solution. The rest of the  
problem is drivers for Android powered tablet and cellphone.

--  
Cheers,
Kurt  
  

Re: Increasing signal reception
On Tue, 19 Apr 2016 11:55:48 -0000 (UTC), Kurt Steinhauser

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Suggestion: set up an access point, but configure it in client mode, so that
it acts as a client to the distant guest network. Use hardware that supports
the better antennas that you plan to use. For example, any wireless router
that supports dd-wrt could be used in client mode, but check to make sure it
has external connectors for the antennas so you can connect your directional
antenna.

Next, wire that device, back to back, with a local access point, preferably
running on a different channel or even a different band, for example 2.4GHz
versus 5GHz.

Your tablet will connect to the local access point and won't need any
special drivers or antennas. Thus, you shift the problem of drivers and
antennas to a piece of hardware that more easily handles such things.

You didn't mention whether the business is cool with you acting as a
semi-permanent guest. That might be something to nail down before you get
too far along.


Re: Increasing signal reception

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Thanks. I will look into implimenting the notion.
The host business provides "guest" access for transients at the  
facility. I am there on business for 8-10 hours usually 1-3 times a  
week. I would be easier if I could park closer to the building, but the  
closest I can park is at the extreme end of the broadcast range of  
their system.  

--  
Cheers,
Kurt  
  

Re: Increasing signal reception
On Mon, 18 Apr 2016 22:10:00 -0000 (UTC), Kurt Steinhauser

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Yes.  You need to enable USB OTG:
<https://en.wikipedia.org/wiki/USB_On-The-Go
As far as I can tell from Googling, the Thrive does NOT support USB
OTG.  However there are apps that enables USB OTG, some of which
require rooting:
<http://www.thriveforums.org/forum/toshiba-thrive-general-discussions/13279-can-i-use-usb-otg-devices-thrive.html
The problem is how to switch the port from one that allows it to
accept power from an external charger, to one that delivers power to
your external USB device.  The spec allows for both to happen at the
same time, but only if the tablet supports it.  I haven't blown up any
ports yet, but I still would be very carefully before doing this.

For my non-rooted Google Nexus 7 (Android 6.0.1) I use ES File
Explorer
<http://www.howtogeek.com/129800/how-to-use-usb-drives-with-the-nexus-7-and-other-android-devices/
to read/write USB flash drives with a USB OTG cable.  Also, I use it
with a no-name mouse.  However, I've never bothered to try an external
wi-fi adapter, so I can't say if it works, or not.

Once you have that accomplished, you have another problem.  The Alfa
1000mw USB adapter probably draws more power than you can supply from
the port.  Find a lower power (lower current drain) USB wi-fi radio.
Then, you can think about drivers.  

As you can see, there is only a little evidence that it can be done:
<https://www.google.com/search?q=usb+otg+wifi+adapter+android&tbm=isch

Good luck and please post something if you succeed.




--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

Re: Increasing signal reception

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Thanks Jeff.

I'll take a look at the links later today. It looks like I should start  
looking at a different tablet and adapter for what I have in mind. But  
you never learn anything without first making an effort.



--  
Cheers,
Kurt  
  

Re: Increasing signal reception
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So, your USB WiFi adapters don't work, and it's not the distance that's the
problem?

If you had a working USB dongle, you could build a cantenna.
I built a few Cantennas a while back, using USB adapters.
Look for the plans online for Cantenna USB.
A large diameter was easier to aim, and maintain, a pair of smaller cans,
soldered end to end, gave better gain.

http://www.rahul.net/dold/clarence/usb-can



--  
Clarence A Dold - Santa Rosa, CA, USA  GPS: 38.47,-122.65

Re: Increasing signal reception

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The adapters work fine for Windows OS. There is a lack of drivers  
apparently for Android. I think that distance is the primary problem in  
that where I park is pretty close to 100m from the signal source.  


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Thanks for the link. I'll look into it.

--  
Cheers,
Kurt  
  

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