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)

• 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

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

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

GGAO7108 pcal power -- 2005.184.21:49:56 pc03.logCh off +/- rms n max min noisy (max-min)/rms1d 49.68 0.04 0.24 40 50.00 49.30 2.952u 49.39 0.04 0.25 40 49.70 49.00 2.763u 54.77 0.04 0.24 40 55.10 54.40 2.954u 59.68 0.05 0.29 40 60.10 59.20 3.135u 60.69 0.04 0.25 40 61.00 60.30 2.806u 74.15 0.05 0.34 40 74.60 73.60 2.917u 72.54 0.03 0.22 40 72.90 72.20 3.178d 73.34 0.04 0.24 40 73.60 72.90 2.889u 47.61 0.01 0.09 40 47.70 47.50 2.13au 47.34 0.01 0.06 40 47.40 47.20 3.58bu 63.31 0.02 0.10 40 63.50 63.10 4.12cu 46.23 0.01 0.06 40 46.40 46.10 5.35du 55.95 0.02 0.11 40 56.10 55.80 2.73eu 59.35 0.02 0.14 40 59.50 59.10 2.79i1 54.20 0.03 0.20 40 54.50 53.90 2.94i2 53.91 0.02 0.10 40 54.10 53.70 4.21i3 63.80 0.04 0.24 40 64.10 63.40 2.88Ch on +/- rms n max min noisy (max-min)/rms1d 50.09 0.04 0.25 41 50.40 49.70 2.822u 49.82 0.04 0.24 41 50.10 49.40 2.923u 55.19 0.04 0.25 41 55.50 54.80 2.804u 60.03 0.05 0.30 41 60.40 59.50 3.015u 61.09 0.04 0.25 41 61.40 60.70 2.776u 74.50 0.05 0.35 41 74.90 73.90 2.867u 72.84 0.04 0.25 41 73.10 72.40 2.838d 73.66 0.04 0.29 41 74.00 73.20 2.809u 48.56 0.02 0.13 41 48.70 48.40 2.35au 48.34 0.02 0.14 41 48.50 48.20 2.07bu 66.85 0.03 0.22 41 67.10 66.60 2.31cu 47.20 0.03 0.18 41 47.40 46.90 2.76du 56.88 0.03 0.20 41 57.10 56.60 2.50eu 60.28 0.03 0.22 41 60.50 60.00 2.27i1 54.58 0.03 0.22 41 54.80 54.20 2.77i2 54.88 0.04 0.26 41 55.10 54.40 2.71i3 64.17 0.04 0.24 41 64.50 63.80 2.94

Ch Diff +/- % +/-% noisy decoder units1d 0.41 0.05 0.83 0.11 232u 0.44 0.05 0.88 0.11 243u 0.42 0.05 0.77 0.10 224u 0.35 0.07 0.59 0.11 195u 0.40 0.06 0.66 0.09 206u 0.35 0.08 0.47 0.10 177u 0.31 0.05 0.42 0.07 168d 0.32 0.06 0.44 0.08 179u 0.95 0.02 2.00 0.05 35au 0.99 0.02 2.10 0.05 36bu 3.54 0.04 5.60 0.06 59cu 0.98 0.03 2.11 0.06 36du 0.93 0.04 1.66 0.06 32eu 0.92 0.04 1.56 0.07 31i1 0.38 0.05 0.70 0.09 21i2 0.97 0.04 1.80 0.08 33i3 0.37 0.05 0.57 0.08 19

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

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