TVEGAS_46 Bank to Bank problems with real hardware, software simulator

Goals

• Check KATCP snaps versus Archivist snaps - Ray has already done this
• Total power and spectrum ratios ADC / filtersnap / HPC spectra
• Identical ratios for varying input power
• Using the new noise source, 300MHz highpass filter, amplifier, attenuator and 8-way splitter

Details

• Set up in simulator at 1pm
• switching_signal_selector is jumpered around (not sure this is necessary)
• Set up lbw_gain. From Randy, empirically the digital filter requires a gain of 5.664 to get -20dBFS into each of real and imag separately, for a -20dBFS input.
• So, set lbw_gain to 2**16 (unity in BOF) * 2**8 (Ray correction for old config_tool)*5.664
• Output power for filtersnap will be -17dBFS, since real and imag powers are summed together.
• By inspection, this is what BOF 123 produces! We have sanity...

Mode 4

• bank_gain_mode4_cband_nocal
• archivist
• setValues with 5.664 (Devexplorer not working well in the simulator, can't check but looks correct.)
• Nominal -20dBFS input corresponds to attenuator setting of -5dB
• Cannot reset scan number
• Scan 63 Aborts - BankE taking too long, same with 64, 65 is ok.
• Scan 65 nominal -5dB
• Scans 66-70, 3,4,5,6,7dB attenuation - Data look fine, but GBTIDL will only plot one polarization?

Mode 1

• bank_gain_mode1_cband_nocal
• archivist
• SetValues is irrelevant
• Attenuation of 5 now corresponds to ~ -20.3dB - stay at this value.
• Scans 71-75, 3,4,5,6,7dB attenuation
• 2pm - all done!