Frequency Coverage and RFI Observations at Effelsberg K. Grypstra, R. Keller, Max-Planck-Institut fr Radioastronomie, Bonn, Germany 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 Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 3 Frequency coverage Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 4 Frequency coverage Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 5 Frequency coverage 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) 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 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 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? ? 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? 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. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 12 Airplane Radar Altimeter Airplanes over Effelsberg GHz 2hrs Aaronia Spectrum Analyzer (2k) 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 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 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 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 Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 17 RFI: Electric Fences Distances 0,5-1km 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. Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 19 Ultra Wide Band UWB 0-5GHz Spurious up to 18GHz 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 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 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 Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 23 Observations through RFI 3C286 Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 24 Usable Frequencies 50cm: MHz protected; TV band IV narrow BW 21cm: GHz protected, outside critical 13cm (S): GHz prot. (no observation / experience) 11cm: GHz protected, surrounded by radar 9cm: GHz & GHz narrow BW 4-4.2GHz Airplane Radar Altimeter 6cm: 4.8-5GHz prot.; free in wide bands GHz earth bound radar, WLAN Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 25 Usable Frequencies 5cm: GHz nothing prot.; free in wide bands 3.6cm (X): GHz prot.; >9GHz classical radar 2.8cm: GHz; not usable in practice TV-sat 1.9cm: & GHz prot.; cm: GHz prot. with gaps; ptp 24 Above: more or less free 86) Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 26 Usable Frequencies Wettzell; March 18-20, 2009 Frequency Coverage and RFI in Effelsberg K. Grypstra, R. Keller, MPIfR 27 Dont suppress! Setup: 100m RT, 15K RX, 20MHz BW, 1420MHz CF.