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?
This topic: KPAF
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SinglePixelTesting_Laboratory
Topic revision:
2016-06-08,
PatrickMurphy
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