NTIA is raising interference concerns over some parts of notice o...

on certain Part 15 devices above 2 GHz. In letter to Office of Engineering & Technology Chief Edmond Thomas, NTIA cited part of proposal that would increase allowable field strengths for radio frequency identification (RFID) rules. On RFID systems, proposal would harmonize U.S. rules with standards for such devices in Europe and Australia. NPRM sought comment on changes in power levels for RFID tags operating at 425-435 MHz, which NTIA said was within 420-450 MHz allocated on primary basis to federal govt. Military systems operating in that spectrum include radiolocation operations for aircraft and missile surveillance, early warning and fire control, said letter from Fredrick Wentland, acting associate administrator of NTIA’s Office of Spectrum Management. “The radiolocation radars in this band include ground, shipborne and airborne radars that are essential to the nation’s homeland defense,” Wentland wrote. NASA also uses band for telemetry and telecommand, he said. Citing preliminary NTIA analysis, he said power level changes in parameters for RFID tags “could result in interference to federal systems” and NTIA and federal agencies “cannot support the proposed rule changes.” In next 90 days, NTIA and agencies will complete studies and provide them to Commission. In NPRM, FCC said it agreed with Savi Technologies that proposed Part 15 changes would allow more advanced systems to operate at 433 MHz. In other areas: (1) NTIA objected to 11 dB increase in field strength limits for RFID tags in 13.11-13.41 MHz. It said 13.26-13.36 MHz was allocated to aeronautical mobile services, which are designated for safety-of-life communications. FAA uses that spectrum for communications in oceanic and remote areas. “The increase in field strength by 11 dB could severely reduce the distance that an aircraft can successfully communicate with a ground flight tracking system,” NTIA said. NTIA recommended use of another part of high frequency band that wouldn’t require increase in Part 15 emission limits in frequency band allocated for Aeronautical Mobile Services. NTIA said it needed 90 more days to complete studies in that area. (2) NTIA said it and other federal agencies also needed another 90 days to complete studies on protection of sensitive services and to identify continuing R&D projects above 38.6 GHz. FCC sought comment on need for changes in restricted bands above 38.6 GHz and whether there were Part 15 rules designed to protect sensitive service such as govt. operations that should be modified. Among govt. services operating in that spectrum are 13 bands used by NASA for space research and Earth exploration satellite service sensors for missions such as weather forecasting and global warming measurements, NTIA said.