VLBA RFI Bulletin 25: GPS Jamming Continues at WSMR in March: Scheduled testing of GPS jamming equipment will continue at the White Sands Missile Range during March, 1999. The GPS jamming tests are scheduled for Tuesdays, Thursdays, and Saturdays (except Tuesday, 990302, and Thursday, 990304). 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) during the scheduled jamming times. The detailed schedule for March, 1999 follows: Tuesdays: 0701 UTC to 1100 UTC (Except 990304) Wednesday, 990303 UTC: 0300 UTC to 0700 UTC Thursdays: 0701 UTC to 1100 UTC (Except 990304) Friday, 990305 UTC: 0300 UTC to 0700 UTC