Feral Jundi

Friday, October 2, 2009

PMC 2.0: Mesh Networks

   This is important research for PMC’s and PSC’s, because if companies want a simple way for contractors to communicate with each other on some disaster zone or war zone gig, then this will allow them to do that.  Especially since most guys have, or will soon have smart phones that are bluetooth and wifi capable. You could add this capability to your communications plan, and if these guys can make this open source and free, then it would be a no-brainer to utilize Mesh Networks.

   In disaster zones and war zones where there is no infrastructure for 3G or cell towers, or those things were destroyed somehow, you must have a communications infrastructure back up system.  Mesh Networks is a possible solution if they can pull it off.  To make it free is even cooler, because then it will not be something that is exclusive to one company or another.  Along with the Mesh Networks, there must also be a way to encrypt the communications or something, and I am sure some technology will come along to do such a thing.  But first things first–get the Mesh Networks going.

    And for military/police/medical/disaster response crews, this will be awesome. For coordinating purposes and for evolving incidents like the Mumbai attack, you must have communications and information sharing systems that have redundancy built into them. If terrorists or some flood destroys the cell tower(s), then you must have an alternative network for everyone to talk on.  This is smart and I wish them all the luck in their research. –Matt

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Researchers developing free mobile mesh network

Munir Kotadia

Oct 1, 2009

Can provide comms during mobile network blackout?

Researchers from Australia and Singapore are developing a wireless ad-hoc mesh networking technology that uses mobile handsets to share and carry information including high quality video.

The mesh network will make use of Bluetooth or Wifi and could be used at a large sporting event, conference, or even a crowded city centre during an emergency, to swap information between handsets – even if the mobile phone network was offline.

(more…)

Friday, June 12, 2009

Technology: The Cantenna–A Field Expedient WiFi Antenna

     On most contracts out there, you will have access to some kind of WiFi or internet connection.  If you have access to some WiFi, yet you are a little far from that WiFi hub to get a full signal, you just might have to make a field expedient antenna to make a connection.  This little DIY site is awesome, and explains the parts and process for building a cheap WiFi Antenna that you could throw away after your contract is over.(save the nuts and bolts, the N type female chassis-mount connector, and wire if you want) You can also buy an amplifier to increase the strength of the signal. These parts are small and light for just a basic Cantenna, and I like that. To read more about WiFi antennas, check this out.

     Also, if you are going to use WiFi over there, make sure to use password protected WiFi hubs, and only use the unsecured WiFi hubs at your own risk.  Also, make sure it is authorized in your AO to set something like this up.  Some camps would not be down with this stuff and others probably don’t care. As to the FCC’s thoughts on WiFi antennas, here you go. –Matt

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Tin Can Waveguide Antenna

How To Build A Tin Can Waveguide WiFi Antenna

Got no dough for a commercial WiFi antenna? Looking for an inexpensive way to increase the range of your wireless network? A tin can waveguide antenna, or Cantenna, may be just the ticket. This design can be built for under $5 U.S. and reuses a food, juice, or other tin can.

I am not an electrical engineer, nor do I have access to any fancy test equipment. I’ve built some antennas that worked for me and thought I would share what I learned. I have no idea if this is safe for your radio or wireless network equipment. The risk to you and your equipment is yours.

Building your Cantenna is easy, just follow these steps.

   1. Collect the parts

   2. Drill or punch holes in your can to mount the probe

   3. Assemble the probe and mount in can

Learn How to Build Antenna Here.

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