1. In 2003, the reverberation chamber measurement processes developed by NASA were extended to address Wireless Local Area Network devices and two-way radios, under a modification to the FAA/NASA Interagency Agreement. Spurious radiated emissions in aircraft radio frequency bands from several wireless network devices were compared with baseline emissions from standard computer laptops and personal digital assistants. In addition, spurious radiated emission data in aircraft radio frequency bands fromseven pairs of two-way radios were provided. A description of the measurement process, device modes of operation and the measurement results were reported. A risk assessment wasprovided for interference fromwirelessnetwork devices and two-way radios to aircraft systems, including Localizer, Glideslope, Very High Frequency Omnidirectional Range, Microwave Landing System and Global Positioning System. The report compared the interference risks associated with emissions from wireless
2. In 2004, NASA built upon the process and results from previous efforts, and evaluated newer generation mobile phones (again under a new modification to the FAA/NASA Interagency Agreement). Two of the latest and most popular technologies used in the US were the CDMA2000 1xRTT (1x Radio Transmission Technology) and the GSM/GPRS (General Packet Radio Service). In addition, phones operating in the higher frequency 1900 MHz band were addressed. Emission measurements were conducted on 33 wireless phones of various design configurations by different manufacturers. These mobile phones were more representative of those available in today's market place than the mobile phones tested previously by NASA. Testing in both voice and data modes was conducted. The
3. Thisisnotthecaseforhigherfrequencybands(TCAS,DME,GPSorMLS). • The measured emissions in the voice and data modes are generally similar for any single device (within2-5