As another example, Microsoft Research demonstrated frequency shifting of
commodity 802.11.bg radios to TV channels ("WhiteFi") as part of their
whitespace dynamic spectrum use research:
http://research.microsoft.com/apps/pubs/default.aspx?id=73481
http://research.microsoft.com/en-us/projects/KNOWS
High-throughput 802.11* is notoriously hard to implement via direct
synthesis using software defined radios. Mixing the frequency of a
commodity miniPCI wifi adapter around to a different band with a "simple"
analog radio frequency circuit as a DIY solution is very appealing to me,
but the 3.6GHz Ubiquity equipment is almost certainly worth their cost on
reliability and performance grounds.
-bryan
On Sun, 27 May 2012, Isaac Wilder wrote:
I asked Dewayne to elaborate, here was his response:
" I thought that I'd address this part of your email separately. What I
referred to in my remarks is a device called a transverter aka linear
translator: <http://en.wikipedia.org/wiki/Transverter>. Hams have been
using these devices for years now. Ubiquiti calls it their 'Frequency
Freedom Technology' and has patented it as applied to a Wi-Fi chipset.
They have used it to put a Wi-Fi chipset in the 900 MHz and 3650 MHz
bands. This way, they didn't have to build a new, proprietary radio to
operate in those bands. I'm including a couple of their PR docs on this
from 2006.
"
imw
On 05/27/2012 05:27 PM, Seth Johnson wrote:
That's Dewayne Hendricks, an old warrior for the Net. Just send him a
note, maybe mentioning Seth Johnson may help a little. He and I
forward information freedom stuff a lot. "Dewayne Hendricks"
<[email protected]>
The particular technical details you want you'd have to ask him, about
that moving things around on the spectrum stuff. I know he's talking
about amateur radio, which gives people a global license to do lots of
stuff freely on shortwave frequencies (I think). There's a very old
school org call ARRL that sometimes gets stirred up to defend the
freedom of the airwaves under the Communications Act. I *think* he
was adding to the topic of software-defined radio, just the point that
with the amateur license you can just go ahead and do a lot of stuff.
Brett Wynkoop is also an old hand in ARRL, shortwave and information
freedom (a key player in New Yorkers for Fair Use). He biked downtown
on 9/11 and provided emergency comms for awhile. Contact him and ask
about what he knows technically. Mentioning my name probably goes
much further in his case, especially if you're going to make something
happen. "Brett Wynkoop" <[email protected]>
Seth Johnson
On Sun, May 27, 2012 at 4:03 PM, Rick Hodgin <[email protected]> wrote:
Shortly after 1hr 18min into this video by Eben Moglen entitled "Innovation Under
Austerity," a man is asked to step up to the mic and discuss the ability to take a
device an move data from one area of the spectrum to another. He talked specifically
about WiFi and cable modems, and a transverter (linear translator), and move it from WiFi
to another area of the free spectrum (by using an amateur radio license).
http://www.youtube.com/watch?v=G2VHf5vpBy8
Does anybody know what he's talking about? Or how to do it? It sounded quite
amazing, but I don't even know what questions to ask about what he's talking
about, let alone where to begin.
Thanks! :-)
Best regards,
Rick C. Hodgin
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