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You are here: NRAO Public Wiki>KPAF Web>DirectorsOffice>EngPlanning>SinglePixelTesting_Laboratory (2016-06-08, PatrickMurphy)
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A large number of laboratory tests were performed before putting the receiver on the antenna. These include:
- Gain curves over frequency band
- Noise temperature measurements (Y factor)
- Baseline stability (Lab Spectrometer Tests)
- Comparison of GBT K band versus KFPA noise cal :KFPA_vs_oldK_(Tcal).pdf
- Spreadsheet of Noise Cal Module values :KFPA_NCM_data-4Sep08.xls
- Plot of LO Spurs showing "spur-free" regions :LO_spur_avoidance_plot.doc
- Conversion Gain versus LO Power :PLO_sweep.gif
- Receiver Noise Temperatur Compared to LNA Noise Temperature :TRX_versus_TLNA.gf
- NoiseMeas5Sep08_1.xls: Lab noise test result spreadsheet
- Total power stability (Integrated power gain)
- Issues(?) noted during lab testing (RDN 04Sep08):
- LO1 +/- 3,4 X LO2 mixer spurs in IF band up to 30dB above TP in 3MHz RBW.
- Ripple and slope in IF output total power: Ripple ~5dB p-p; slope ~-5dB 1.2-2.8 GHz.
- IF rolloff 2.8-3.0 GHz.
- Noise increase at high frequency end. Need to understand cause at least.
- LO1 frequency range. Desirable to tune 18 & 26.5 GHz to center IF?
- Series resistance high in noise module driver circuit.
- Multilevel Tcals? Is this a requirement?
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Topic revision: r3 - 2016-06-08, PatrickMurphy
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