Computerworld - The High Performance Wireless Research and Education Network (HPWREN) has cut back the power it uses on a 72-mile WLAN link between San Diego and San Clemente Island.
Operating in the same 2.4-GHz frequency band used by wireless LANs, the agency reduced a power amplifier it uses from 1 watt to 250 milliwatts following complaints that the original configuration was illegal after a story about it appeared in Computerworld (see story).
Hans Werner-Braun, principal investigator for HPWREN, said the network, based at the San Diego Supercomputer Center on the campus of the University of California, San Diego, made the change last weekend on the long-shot connection to San Clemente Island in order to stay within Federal Communications Commission regulations for power levels on the 2.4-GHz band.
Computerworld received numerous e-mail complaints that HPWREN was in violation of FCC power limits following publication of its original story. Steve Bragg, a senior electronics engineer at Internet Telemetry Corp. in Tulsa, Okla., called the HPWREN San Clemente Island link illegal, saying, "If I was the FCC, I would bust these guys."
Werner-Braun said any violation of the power limits was unintentional and resulted from the fact that the personnel working on HPWREN primarily have expertise in computers and not radio technology. Based on research he has done in the past week, Werner-Braun said he could actually operate at "a much higher EIRP just by reducing the antenna input power and using huge high-gain antennas."
EIRP stands for effective isotropically radiated power, which is the power supplied to an antenna, plus its gain.
Instead, Werner-Braun said, HPWREN chose to reduce power to the 2-ft. parabolic antennas by 75%. Even at that lower power level, he said, HPWREN has managed to maintain the 72-mile link to San Clemente Island, although data throughput has now dropped to about 300K bit/sec.
The link is used to carry data from a seismograph, data logger and Global Positioning System receiver. It cost about $3,000 to build and install.
Computerworld has asked FCC officials for comments on the complaints about the San Clemente Island link, but the agency hasn't responded.
What do you think about the project? Post your thoughts and see what others have to say, in our discussion forum.
Read more about Mobile/Wireless in Computerworld's Mobile/Wireless Topic Center.
- Securing the enterprise workspace: protect your organization while supporting mobility and BYOD Read this white paper to learn ways to bolster security across enterprise networks while giving employees simple, authorized remote access to corporate applications...
- Transforming enterprise applications for mobile environments Read this white paper for tips on how to prepare critical applications to be securely accessed from an array of company-owned and personal...
- Future-proof your mobility strategy with Dell Enterprise Mobility Management Read this paper to discover best practices to future-proof your mobile strategy in the evolving world of devices, operating systems, work habits and...
- Enabling devices and device management for your mobility/BYOD program Read this white paper to learn how to support employees with the best devices to increase flexibility, productivity and job satisfaction.
- Don't Believe the Hype: Not All Containers are Created Equal Hear executives discuss the 3 C's of Secure Mobility-content, credentials, and configurations-and learn the inherent security risks to your organization of using MDM...
- Navigating the New Wireless Landscape Thriving in the new wireless landscape View Now>> All Mobile/Wireless White Papers | Webcasts