VLBA RFI Bulletin 23: GPS Jamming Continues at WSMR in February: Scheduled testing of GPS jamming equipment will continue at the White Sands Missile Range during February, 1999. The GPS jamming tests are scheduled for Tuesdays, Thursdays, and Saturdays (except Tuesday, 990216, and Thursday, 990218). 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 February, 1999 follows: Tuesdays: 0701 UTC to 1100 UTC (Except 990216) Wednesday, 990217 UTC: 0300 UTC to 0700 UTC Thursdays: 0701 UTC to 1100 UTC (Except 990218) Friday, 990219 UTC: 0300 UTC to 0700 UTC