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RDBE Spurious Tones

RDBE Spurious Tones. Matt Luce/Jim Jackson October 2011. Overview. The Problem Initial Measurements Mitigation Attempts Future Work. The Problem: RDBE Internals. The Problem: First Indicators. The Problem: First Indicators. Looking Closer w/PFBG 1.4. Looking Closer w/PFBG 1.4 (PCAL).

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RDBE Spurious Tones

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  1. RDBE Spurious Tones Matt Luce/Jim Jackson October 2011

  2. Overview • The Problem • Initial Measurements • Mitigation Attempts • Future Work

  3. The Problem: RDBE Internals

  4. The Problem: First Indicators

  5. The Problem: First Indicators

  6. Looking Closer w/PFBG 1.4

  7. Looking Closer w/PFBG 1.4 (PCAL)

  8. Looking Closer w/DDC 832 MHz 896 MHz

  9. Looking Closer w/bpplotter

  10. Looking Closer w/bpplotter

  11. Looking Closer: Terminated ADC inputs

  12. Mitigation I: Ground Isolation

  13. Mitigation II: DC block on 1024MHz

  14. Future Work • RFI Shielding of iADC • Custom • Foil • KATADC • Requires a new adc_interface • Potentially removes ALC box.

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