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Frequency Coverage and RFI Observations at Effelsberg

Frequency Coverage and RFI Observations at Effelsberg. K. Grypstra, R. Keller, Max-Planck-Institut für Radioastronomie, Bonn, Germany. Overview. Frequency coverage and protected bands RFI at low frequencies Observations in an RFI polluted environment. Frequency coverage. Frequency coverage.

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Frequency Coverage and RFI Observations at Effelsberg

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

  2. Overview • Frequency coverage and protected bands • RFI at low frequencies • Observations in an RFI polluted environment Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  3. Frequency coverage Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  4. Frequency coverage Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  5. Frequency coverage Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  6. RFI at 18cm • RFI Signal • Spectral Lines(same scale) 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 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 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? • ? 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? Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  11. RFI at 18cm BackendArtefacts Setup: • 100m RT • 20K RX • FFT-Spectr. Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  12. Airplane Radar Altimeter • Airplanes over Effelsberg • 4.2-4.4GHz • 2hrs • AaroniaSpectrum Analyzer(2k€) 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 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 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  15. RFI examples: Wireless • WLAN 5.28GHz SAPOS-GSM WLAN Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  16. RFI examples: Wireless • WLAN 5.28GHz • Time Series • OFDMAOrthogonal Frequency Division Multiple Access • Setup: • LogPer • 200K LNA • R&S FSH6 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  17. RFI: Electric Fences • Distances0,5-1km 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. Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

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

  23. 3C28618.6Jy @21cm Observations through RFI 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 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) Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

  26. Usable Frequencies Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR

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

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