Interference Protection Group meeting 9/22/98 Agenda Minutes of 9/8/98 meeting Interference call-out reports Review of action items: 1. Measurement of GBT receiver room shielding (Mark) a. Are cables in the feed arm servo cabinet properly terminated? (Tim, Rich) 2. L.O.'s, filters, detectors, and power splitters for anechoic chamber (Rick, Rich) 3. "Cheat sheet" for PC software in anechoic chamber (Tim) 4. FCC Class B requirements and test procedures (Rick, Chuck) 5. Quiet zone education initiatives (Mark, Chuck) 6. Training of 140' operators on RFI database (Rick) 7. L-band receiver filters for Iridium and Glonass (Rick) 8. Fluorescent fixture specs for lab addition (Mark) 9. Air Force use of the G.P.S. L3 signal at 1383.3 MHz (Mark) 10. RFI blanking signals to GBT backends a. "OR" of internal and external spectral processor blanking (Rich) b. "Blanking Signal Combiner" to the GBT suite of equipment (John) 11. Monitor station design (Rick) 12. Publicly available version of RFI measurements of GBT equipment (Chuck) 13. List of items to be tested in anechoic chamber (All) 14. Technical seminar on RFI suppression requirements and techniques (Rick) 15. GBT feed arm servo system RFI measurements (Tim, Chuck) 16. Cal and sig/ref switching system system for anechoic chamber (Rich, Chuck, Rick) 17. PC and workstation shielded test box (Chuck) 18. RFI suppression when interferometer control building converted to a tourist facility (Rick) 19. Site radio system tests (Chuck) 20. GBT RFI 'harmful levels' document (Rick) 21. RFI measurement mobile cart (Rich, Chuck) 22. Use of spectral processor with anechoic chamber (Rick) Summary of new action items Next meeting time/date