VLBA RFI Bulletin 14: GPS Jamming Continues at WSMR in August: Scheduled testing of GPS jamming equipment will continue at the White Sands Missile Range during August, 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 August, 1998 follows: Tuesdays: 0601 UTC to 1000 UTC Thursdays: 0601 UTC to 1000 UTC