Greetings,
Super WiFi is supposed to be around 700MHz, have a range of miles, and hundreds of megabits per second, but all the radio modems I see around that frequency are just few k per seconds. Why aren’t there any megabit radio modems?
Thanks
Super WiFi is some marketing bunk.
WiFi is a trademark of the WiFi industrial alliance.
WiFi uses the IEEE 802.11 family of standards.
The embedded microprocessor world has lots of alternatives for wireless data. From a few hundred bits per second, to a popular base around 250Kbps, to WiFi modules made easy to integrate. But few embedded microprocessor projects need megabit rates.
The IEEE 802.15.4 standard is popular, with Digi’s XBee being one of a dozen or more vendors of such standards-based modules.
Most of the other small wireless data radios are proprietary and have no standard for cross-vendor interoperability, if that’s important. A standard also brings second-sourcing for price competition and risk reduction.
In 700MHz, the pervasive new wireless initiative is Long Term Evolution (LTE), this being the 4G cellular deploying by Verizon. It’s intended for use in licensed RF spectrum.
Maybe the so-far notional super wifi will come to be; but sub-GHz spectrum like 700MHz is so rare and precious that it seems unlikely that unlicensed uses will be permitted. And WiFi means unlicensed to consumers.
stevech:
Super WiFi is some marketing bunk.Maybe the so-far notional super wifi will come to be; but sub-GHz spectrum like 700MHz is so rare and precious that it seems unlikely that unlicensed uses will be permitted. And WiFi means unlicensed to consumers.
What do you mean about Super WiFi? The FCC voted in September to open up the white spaces from around 50MHz to 700MHz to public use. They are unlicensed and available for anyone to use.
Microsoft calls it “White-Fi” and is testing technology on their Redmond campus.
This guy has created a Super WiFi network by using a frequency translator to convert 2.GHz WiFi signals to 563MHz.
http://arstechnica.com/tech-policy/news … annels.ars
I want something like that now that the frequencies are open until there is a hardware standard. I have only found the every slow XBee modems.
I found two companies making high-speed long-range radio modules for the 300MHz to 900MHz white space spectrum.
Doodle Labs
http://doodlelabs.com/products-and-services.html
Xagyl Communications
http://www.xagyl.com/store/home.php?cat=251
I would like to see schematics for these!
Anyone have any idea how to make your own?
DARPA has a big white space program going.
Last I read, the FCC has yet to set a policy authorizing use of white space spectrum, where that is mostly in bands licensed/allocated for certain services.