Austin_HSMM - Wireless Networking in the 420 MHz Band paper

Steve stevewa206 at gmail.com
Fri Aug 10 09:37:17 PDT 2012


I think that those little devices are saw tooth modulation. Very different
than OFDM, which is made for Long distance and data recovery.
Might be fun to try, I used some years ago for a art project and was able
to to the signal across 1st ave in Pioneer Square reliably.

Steve N0FPF


On Friday, August 10, 2012, Bill Vodall wrote:

> I bet we can do the same with the $19 RF modules at 433 MHz.
>
> 73
> Bill - WA7NWP
>
>
> ---------- Forwarded message ----------
> Date: Fri, Aug 10, 2012 at 4:24 AM
> Subject: [Austin_HSMM_Development] Experimenting with ... Wireless
> Networking in the 420 MHz Band paper
>
>
> 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
>
> I am posting this notice to this group since HSMM-MESH(tm) is mentioned.
>
> 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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