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Very often I'm being asked how can we aim such long distance WiFi links. A relatively simple way of doing this would be to use a high-power analog signal transmitter fed into the antenna on one side, with a spectrum analyzer identifying that signal on the other side. In our global village world - we can find the above for less then $300 (total for both sides), which conventionally would cost way over $10,000: Buy a high-power 2.4Ghz video transmitter from:www.chinawholesaleonline.org
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Here is the small transmitter being measured with a spectrum analyzer to establish the power. Look at the nice and stable analog signal which is so easy to spot on the far side. |
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My talk at UC-Berkeley, could serve as decent and current source of information about AirJaldi. It's an hour long and no commercials ... Enjoy: Watch the video - |
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I'm happy to announce that all 4 wireless routers which where installed on AirJaldi's main tower in Upper-TCV school, where replaced by a single router from the Czech republic!
Thanks to the generous donation of Mr. Lukas Hudecek from IteQ s.r.o of his newly designed quad-radio router. The robust cast-Aluminum weather-proof enclosure with a massive heat-sink, hosts a MikroTik Router-Board 523A board. The 4 high-quality Reverse SMA RF connectors at the bottom are an excellent choice for the most demanding outdoors installations of both 5.8 and 2.4 bands, while maintaining a port-density better then what bulky N-type connectors offer. We feed the router with 48v (it's more like a 56v with batteries fully charged) over a very long PoE drop, through the IP67-rated Ethernet connector. A proprietary optional connector is added for special applications, such as daisy-chaining additional routers, connecting a video camera etc. The router is loaded with an AirJaldi Mesh firmware, based on Kamikaze release of OpenWRT. More details can be found on Itec's web sites: http://www.outdoor-wireless.com/ Hopefully - we where able to provide Lukas with valuable feedback, which will contribute to an even better version of this router in the future. Many thanks Lukas ! We look forward for future collaboration... |
Dinesh & Rana install the IteQ router on the TCV Tower. |

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This post is long due, but like they say - better late then never. Following the AirJaldi conference (end of October 2006) David Rowe came to visit us in Dharamsala, all the way from far Australia.
David is leading a unique and exceptionally important project of revolutionary potential: Free Telephony Project While many of us are still getting used to, and learning the concept of Free / Open Source Software (F/OSS), David's project introduces additional confusion, yet equally innovative concept: Open-Source-Hardware |
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Finaly, the new server for AirJaldi is installed and is ready for service. Well, this is what it looks like ------------------->>> The server is hosted in Hurrican Electric farm in Fremont, Califronia. |
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The new server will host all sites, content and services related to AirJaldi. In addition, pending bandwidth and time constrains, we welcome all Tibetan non-profits and other non-profits affiliated with us to host their sites with us. The machine is managed by a group of volunteer system administrators from around the world.
Thanks everyone for the hard work in making this operational.
<< Jim - installing the server at HE.net. Photo: Yahel. |
Very soon after the installation on Intel's roof in Berkeley, we'd setup the other end of the link - on the roof of Sun-Micro-Systems in Menlo Park .
It was a very clear day - we could actually see the Intel building all the way far at the Berkeley side - easy aiming...
Excellent link..

Yahel installing a 2.4 grid on the roof of Sun MicroSystems - in Menlo-Park, CA.
Photo: Jim Forster.
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The year (2007) started with Mikey's visit to California. The plan (which did happen) was to go over the year's workplan and genrally do lots of talking... |
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Mikey on the roof of Intel Research - Berkeley - mounting an antenna which is used for TIER's long-distance WiFi experiments.
The far end of the link is in the sount-bay, on the roof of Sun-Microsystems.
In the background: San-Francisco, The bay-bridge and the golden-gate bridge.
(C) Photo: Yahel Ben-David.