VLBA RFI Bulletin 12: GPS Jamming Continues at WSMR in June: Scheduled testing of GPS jamming equipment will continue at the White Sands Missile Range during June, 1998. The GPS jamming tests are scheduled for Tuesdays, Thursdays, and Saturdays. Observers using the VLBA-PT and VLBA-LA receivers should expect an increased chance of RFI at the 2 GPS frequencies of 1575 MHz (L1) and 1228 MHz (L2). The detailed schedule for June, 1998 follows: Tuesdays: 0601 UTC to 1000 UTC (Except 980602) Tuesday, 980602: 1200 UTC to 1600 UTC Thursdays: 0601 UTC to 1000 UTC