VLBA RFI Bulletin 33: GPS Jamming Continues at WSMR in December: Scheduled testing of GPS jamming equipment will continue at the White Sands Missile Range during December, 1999. The GPS jamming tests are scheduled for Wednesdays, Fridays, and Sundays (UTC time). 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 December, 1999 follows: UTC Wednesdays: 0300 UTC to 0700 UTC UTC Fridays: 0300 UTC to 0700 UTC UTC Sundays: 0300 UTC to 0700 UTC