Other Web Sites of Interest

On Spread Spectrum Communications


Amateur Radio | Academic | Regulations | Organizations | Commercial


Amateur Radio

Barry McLarnon, VE3JF has compiled a Wireless LAN Modem Product Directory. This is a survey of wireless LAN modem products currently available.

On Phil Karn's, KA9Q, WWW page, he describes several amateur digital applications regarding digital audio and digital coding techniques.

On N6GN's Higher Speed Packet WWW Page Glenn Elmore, N6GN, describes his Layer 3 TNC Project Hardware complete with block diagrams, phasenoise and spectral plots, and information on L3TNC, which is a DSSS radio.

Lew Shannon, K0RR, lshannon@uh2309p02.daytonoh.ATTGIS.COM is pushing the edge of packet radio networking. He has a 2mbs high speed packet link working over a 1/2 mile path on 910mhz between W8PLQ and himself. They are using wireless LAN (AT&T's Wavlan) cards at 250mw using spread spectrum technology. He found it necessary to put a 33ele loop yagi with hardline up at about 45ft in an attempt to get over the trees.

They are getting a measured 98% packet reliability rate over the link. They are using the standard packet driver that comes with the WavLan cards. His JNOS 1.10i system serves as the router and bridge to the Ohio 19.2kb UHF packet network.

The 386/20 system has an Ethernet adapter which is linked to his Win95 486/66. The differences in throughput over the WavLan link and Ethernet are hardly noticeable when moving large files via FTP (it's FAST).

This was a low budget operation with hardline scrounged from a local cable company that was doing large scale conversion to fiber. The real deal was getting access to some early beta versions of the WavLan cards that were no longer needed. It's amazing what you can do when the price is right!


Academic

The University of Massachusetts Amherst has a Wireless LAN Group.

The Home System Project is a project at the Delft University of Technology in the Netherlands that employs spread spectrum technology. They have the best web page yet that describes the principles of Spread Spectrum communication. Complete with illustrations and bibliography.

The Telecommunication Laboratory of the University of Oulu in Finland is doing Spread Spectrum Research.

Arizona State University's Telecommunications Research Center (TRC) Communications Group is doing research in Spread Spectrum Communications.

Kyler Laird of Purdue University's Agricultural Engineering Department has htmlized David Kent's (dkent@world.std.com) list of Wireless Modems.

Rutgers University's Wireless Information Network Laboratory maintains a Links to other interesting sites page.


Regulations

Federal Communications Commission

Code of Federal Regulations


Organizations

The Wireless Opportunities Coalition is a diverse group of organizations and companies dedicated to preserving and expanding the opportunities for growth in the wireless industry. The Coalition's primary focus is to support the development, manufacture, and use of wireless communications and related devices which are not licensed by the Federal Communications Commission (FCC) but are regulated under "Part 15" of the FCC's rules. Many of these devices share the 902-928 MHz frequency band.


Commercial

Qualcomm. A leader in CDMA technology.

Xetron Corporation, a subsidiary of Westinghouse Electric Corporation, is manufacturing an OEM spread spectrum transceiver for portable applications called the Hummingbird 902.

Cabletron Systems has teamed up with Windata, Inc., a leading developer of wireless information networks, to expand its wireless networking solutions with the introduction of the AirPort Series, a wireless interbuilding ethernet system.

Tetherless Access Ltd. (TAL) maintains a Web server that describes their products and also has on-line a short Background information on spread spectrum technology.

Com21, Inc. is a privately held company developing telecommunications technology. Read Paul Baran's Keynote Address to the 8th Annual Conference on Next Generation Networks held in Washington, D.C. on November 9, 1994, entitled Visions of the 21st Century Communications: Is the Shortage of Radio Spectrum for Broadband Networks of the Future a Self Made Problem?

Northwest Technical Services maintains a Web server describing many of the commercial wireless products they carry. There is a short Spread Spectrum Information page about a few basics on spread spectrum that leans toward Part 15 devices.

Cylink Corporation is the maker of Airlink, a spread spectrum wireless modem. Here is a short Why Spread Spectrum ? page that introduces the Airlink product. There is even price information to give you a feel for the cost of these devices.

FreeWave Technologies is the maker of RS-232 Radios, another spread spectrum radio product, this one employing frequency hopping spread spectrum. There is also a price sheet on-line. Here is another information page about the FreeWave Wireless Modem at Purdue University's Agricultural Engineering Department.

Metricom and Metricom Canada manufactures the Ricochet wireless frequency hopping spread spectrum modem which connects to their network so you can surf the net, check your e-mail or retrieve office documents. Check out their vision of wireless data networks at the Canada site.

A short description of the Windata's FreePort Wireless Ethernet LAN System that uses spread spectrum technology is given on O'Reilly & Associates Global Network Navigator.

Digital Equipment Corporation describes their WaveLAN International PC Network Interface Card and RoamAbout Wireless-to-Wired Access Point products that use spread spectrum technology.

Atec, Inc. has a line of wireless products for data acquisition for laboratory and field applications using spread spectrum technology.

NCR/AT&T Global Information Solutions WaveLAN Wireless LAN information. (spread spectrum?)

Wireless World, a comprehensive information source for the Wireless Communications Industry by Tim Cocklin


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