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Baseband Bandpass Shape

Baseband Bandpass Shape. Procedure Samples amplitude phase-cal at for all expected tones Analysis Plots Amplitude versus frequency. Baseband LSB Image Rejection. Procedure Sample amplitude of expected phase-cal tones in USB ( ampU ) Sample amplitude of false images in LSB ( ampL )

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Baseband Bandpass Shape

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  1. Baseband Bandpass Shape • Procedure • Samples amplitude phase-cal at for all expected tones • Analysis • Plots Amplitude versus frequency

  2. Baseband LSB Image Rejection • Procedure • Sample amplitude of expected phase-cal tones in USB (ampU) • Sample amplitude of false images in LSB (ampL) • Analysis • Rejection is 20*log10(ampL/ampU) • Solid line with solid points • Sensitivity is 20*log10(1/ampU) • Dotted line • Plot as a function of frequency • USB Procedure and Analysis is similar

  3. Phase-cal Spurious Signals • Procedure • Sample amplitude of expected phase-cal tones in LSB and USB (amp) • Sample amplitude of false images in LSB and USB for four states (false): • Phase-cal off, LO on • LO off, phase-cal on • Phase-cal 5 MHz disconnected, LO on • Switching • Automatic • Manual with fs,prompt prompting (5 prompts) • Analysis • Rejection is 20*log10(false/amp) • Solid lines with points • Sensitivity is 20*log10(1/amp) • Dotted line • Plot as a function of frequency

  4. Phase-cal power • Procedure • Sample Tsys with phase-cal on (PCon) • Sample Tsys with phase-cal off (PCoff) • Switching • Automated • Manual with fs.prompt prompting (5 times) • Analysis • 100*(PCon-PCoff)/PCoff • Uncertainties propagated

  5. GGAO7108 pcal power -- 2005.184.21:49:56 pc03.log Ch off +/- rms n max min noisy (max-min)/rms 1d 49.68 0.04 0.24 40 50.00 49.30 2.95 2u 49.39 0.04 0.25 40 49.70 49.00 2.76 3u 54.77 0.04 0.24 40 55.10 54.40 2.95 4u 59.68 0.05 0.29 40 60.10 59.20 3.13 5u 60.69 0.04 0.25 40 61.00 60.30 2.80 6u 74.15 0.05 0.34 40 74.60 73.60 2.91 7u 72.54 0.03 0.22 40 72.90 72.20 3.17 8d 73.34 0.04 0.24 40 73.60 72.90 2.88 9u 47.61 0.01 0.09 40 47.70 47.50 2.13 au 47.34 0.01 0.06 40 47.40 47.20 3.58 bu 63.31 0.02 0.10 40 63.50 63.10 4.12 cu 46.23 0.01 0.06 40 46.40 46.10 5.35 du 55.95 0.02 0.11 40 56.10 55.80 2.73 eu 59.35 0.02 0.14 40 59.50 59.10 2.79 i1 54.20 0.03 0.20 40 54.50 53.90 2.94 i2 53.91 0.02 0.10 40 54.10 53.70 4.21 i3 63.80 0.04 0.24 40 64.10 63.40 2.88 Ch on +/- rms n max min noisy (max-min)/rms 1d 50.09 0.04 0.25 41 50.40 49.70 2.82 2u 49.82 0.04 0.24 41 50.10 49.40 2.92 3u 55.19 0.04 0.25 41 55.50 54.80 2.80 4u 60.03 0.05 0.30 41 60.40 59.50 3.01 5u 61.09 0.04 0.25 41 61.40 60.70 2.77 6u 74.50 0.05 0.35 41 74.90 73.90 2.86 7u 72.84 0.04 0.25 41 73.10 72.40 2.83 8d 73.66 0.04 0.29 41 74.00 73.20 2.80 9u 48.56 0.02 0.13 41 48.70 48.40 2.35 au 48.34 0.02 0.14 41 48.50 48.20 2.07 bu 66.85 0.03 0.22 41 67.10 66.60 2.31 cu 47.20 0.03 0.18 41 47.40 46.90 2.76 du 56.88 0.03 0.20 41 57.10 56.60 2.50 eu 60.28 0.03 0.22 41 60.50 60.00 2.27 i1 54.58 0.03 0.22 41 54.80 54.20 2.77 i2 54.88 0.04 0.26 41 55.10 54.40 2.71 i3 64.17 0.04 0.24 41 64.50 63.80 2.94

  6. Ch Diff +/- % +/-% noisy decoder units 1d 0.41 0.05 0.83 0.11 23 2u 0.44 0.05 0.88 0.11 24 3u 0.42 0.05 0.77 0.10 22 4u 0.35 0.07 0.59 0.11 19 5u 0.40 0.06 0.66 0.09 20 6u 0.35 0.08 0.47 0.10 17 7u 0.31 0.05 0.42 0.07 16 8d 0.32 0.06 0.44 0.08 17 9u 0.95 0.02 2.00 0.05 35 au 0.99 0.02 2.10 0.05 36 bu 3.54 0.04 5.60 0.06 59 cu 0.98 0.03 2.11 0.06 36 du 0.93 0.04 1.66 0.06 32 eu 0.92 0.04 1.56 0.07 31 i1 0.38 0.05 0.70 0.09 21 i2 0.97 0.04 1.80 0.08 33 i3 0.37 0.05 0.57 0.08 19

  7. Sampler Statistics • Procedure • Collect sampler statistics from each channel • Analysis • Plot statistics with a priori expected levels (dashed line) • Displayed as raw levels or deviations from nominal

  8. Stability Tests • Procedure • Orientation-dependent variations • While the antenna is moved over its range of motion, sample cable and phase-cal • Short-term variations • With the antenna stationary, sample, at a very high rate, cable and phase-cal • Diurnal variations • For a 24 hour period, sample, wx, cable, phase-cal, RX parameters, fmout-gps, Tsys • Analysis • Plot program plots whatever is found in the log • Differential phases within bands can be plotted

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