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[Ham-80211] Experimenting with ... Wireless Networking in the 420 MHz Band paper

N9jim-6@pacbell.net n9jim-6 at pacbell.net
Fri Aug 10 14:34:30 UTC 2012


David,
Thanks for sharing here!
I was looking at trying these cards when they were introduced. Glad to see a write up.
Instead we've been experimenting with the 3.4 ghz ubiquiti equipment. Hope to have a paper at microwaveUpdate in October in Santa Clara, Ca.

Jim
n9jim


On Aug 10, 2012, at 5:21 AM, David Bern <David.Bern at Engineer.com> wrote:

> Friends:
> 
> I submitted a paper entitled Experimenting with High-Speed Wireless
> Networking in the 420 MHz Band to the The 31th Annual ARRL and TAPR
> Digital Communications Conference on September 21-23, 2012 in Atlanta, GA.
> 
> http://www.tapr.org/dcc.html
> 
> 
> ABSTRACT:
> 
> This paper reports on our testing the Doodle Labs DL435-30 and Xagyl
> Communications XC420M wireless networking miniPCI cards. They behave
> like IEEE 802.11 wireless networking cards but operate in the 420 MHz
> band. We have successfully tested these cards over 10 miles at about
> three Mbit/s data rate at a 5 MHz bandwidth in the 420 to 426 MHz ATV
> sub-band. Our test applications were a Webcam video streaming program
> and a file download server program that ran on inexpensive netbook
> computers.
> 
> . . .
> 
> 
> CONCLUSIONS AND RECOMMENDATIONS:
> 
> We can confidently claim that the Doodle Labs DL435-30 and the Xagyl
> Communications XC420M wireless networking cards on 420 MHz work as
> advertised. They have comparable performance since they easily passed
> our acceptance test of one Mbit/s data rate over a 10 mile distance.
> The Doodle Labs cards appear to have a faster data rate, but in North
> America, the Xagyl cards are more conveniently available since they are
> shipped from a U. S. address or a Canadian address and they were 35
> percent less expensive than the Doodle Labs cards at time of purchase.
> 
> We have demonstrated that it is possible to assemble a long distance
> high-speed data link on 420 MHz with only purchased available
> components. The only construction required was to make quarter wave
> antennas and to drill holes in lightweight metal boxes.
> 
> . . .
> 
> 
> The full version of this paper can be found at
> 
> http://www.tapr.org/pdf/DCC2012-Experimenting-...-Wireless-Networking-in-420-MHz-Band-W2LNX.pdf
> 
> 
> Thank you,
> David, W2LNX
> 
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