1. Frequency Coverage and RFI Observations at Effelsberg K. Grypstra, R. Keller, Max-Planck-Institut für Radioastronomie, Bonn, Germany

2. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 2 Overview Frequency coverage and protected bands RFI at low frequencies Observations in an RFI polluted environment

3. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 3 Frequency coverage

4. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 4 Frequency coverage

5. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 5 Frequency coverage

6. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 6 RFI at 18cm RFI Signal Spectral Lines (same scale)

7. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 7 RFI examples: TV Analogue –High level carriers –Low spectral density in between Digital –No carriers –High spectral density –Lower power level

8. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 8 RFI by Radar Signals Radar Spectrum at Effelsberg 1.0 – 1.2 GHz Setup: Log Periodic + 120K LNA + Spectrum Analyzer

9. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 9 RFI at 21cm Setup: 100m RT 15K RX 9x20MHz Source: PCs? Media Converters? WebCam? Radar? ?

10. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 10 RFI at 18cm Setup: 100m RT 20K RX Source: PCs? Media Converters? WebCam?

11. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 11 RFI at 18cm Backend Artefacts Setup: 100m RT 20K RX FFT-Spectr.

12. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 12 Airplane Radar Altimeter Airplanes over Effelsberg 4.2-4.4GHz 2hrs Aaronia Spectrum Analyzer (2k€)

13. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 13 RFI examples: UMTS UMTS On the field Setup: –LogPer –200K LNA –R&S FSH6

14. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 14 RFI examples: Wireless WLAN 2.4GHz Spectrum 50MHz Setup: –LogPer –200K LNA –R&S FSH6

15. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 15 RFI examples: Wireless WLAN 5.28GHz SAPOS-GSM WLAN

16. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 16 RFI examples: Wireless WLAN 5.28GHz Time Series OFDMA Orthogonal Frequency Division Multiple Access Setup: –LogPer –200K LNA –R&S FSH6

17. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 17 RFI: Electric Fences Distances 0,5-1km

18. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 18 RFI: Electric Fences ‚Pulsar‘ 1.382sec Setup: –100m RT –20K L-Band RX –FFT Anal.

19. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 19 Ultra Wide Band UWB Generator @ 0-5GHz Spurious up to 18GHz

20. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 20 RFI and Measurements GSM900 Setup: –LogPer. –120K LNA –30dB Gain –R&S FSH6

21. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 21 RFI and Measurements GSM900 Setup: –LogPer. –200K LNA –12dB Gain –R&S FSH6

22. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 22 RFI and Measurements GSM900 Setup: –LogPer. –200K LNA –12dB Gain –R&S FSH6 –Pointed to zenith

23. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 23 Observations through RFI 3C286 18.6Jy @21cm

24. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 24 Usable Frequencies 50cm: 608-614MHz protected; TV band IV narrow BW 21cm: 1.4-1.427GHz protected, outside critical 13cm (S): 2.2-2.29GHz prot. (no observation / experience) 11cm: 2.69-2.7GHz protected, surrounded by radar 9cm: 3.26-3.267GHz & 3.332-3.339GHz narrow BW –4-4.2GHz Airplane Radar Altimeter 6cm: 4.8-5GHz prot.; free in wide bands –5.1-5.5GHz earth bound radar, WLAN

25. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 25 Usable Frequencies 5cm: 5.7-6.7GHz nothing prot.; free in wide bands 3.6cm (X): 8.215-8.4GHz prot.; >9GHz classical radar 2.8cm: 10.6-10.7GHz; not usable in practice → TV-sat 1.9cm: 14.47-14.5 & 15.35-15.4GHz prot.; radar @ 16.7 1.3cm: 22.01-24GHz prot. with gaps; ptp comm. @ 24 Above: more or less free (cloudsat @ 86)

26. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 26 Usable Frequencies

27. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 27 Don‘t suppress! Setup: 100m RT, 15K RX, 20MHz BW, 1420MHz CF.