VLBA RFI Bulletin 10: GPS Jamming Continues at WSMR: Scheduled testing of GPS jamming equipment will continue at the White Sands Missile Range during April, 1998. The GPS jamming tests are scheduled for Tuesdays, Thursdays, and Saturdays. Observers using the VLBA-LA and VLBA-PT sites should expect an increased chance of RFI at the 2 GPS frequencies of 1575 MHz (L1) and 1228 MHz (L2). The detailed schedule for April, 1998 follows: Tuesdays: 0601 UTC to 1000 UTC (Except 980407 & 980428) Tuesday, 980407,980428: 1200 UTC to 1600 UTC Thursdays: 0601 UTC to 1000 UTC (Except 980402) Thursday 980402: 0701 UTC to 1100 UTC