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Baseband Bandpass Shape

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Presentation on theme: "Baseband Bandpass Shape"— Presentation transcript:

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

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3 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

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5 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

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9 Phase-cal power Procedure Analysis
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

10 GGAO7108 pcal power -- 2005.184.21:49:56 pc03.log
Ch off /- rms n max min noisy (max-min)/rms 1d 2u 3u 4u 5u 6u 7u 8d 9u au bu cu du eu i i i Ch on /- rms n max min noisy (max-min)/rms 1d 2u 3u 4u 5u 6u 7u 8d 9u au bu cu du eu i i i

11 Ch Diff +/- % +/-% noisy decoder units
au bu cu du eu i i i

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

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15 Stability Tests Procedure Analysis 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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