TGBT14A_912_85 - VEGAS tests with the DCR

Goals

• Configure VEGAS for cal switching; look at VEGAS IF module monitor with DCR
• try Modes 1 and 4 with different input levels with X and L band (if time allows)
• need to check what order Galen has hooked up the test inputs into.

Details

• Set up at 10am. Need ray to switch versions, etc
• Note, weather is lousy; thick fog, clouds, rain....
• X-band in focus, telescope at access, people working in the receiver cabin.

Setup

• Set up as for session 84, but correct the automated setup of the external input to the Analog Filter Rack

X-band, Mode 4, high cal

• Scan 1 fails; Antenna is still in scan coordinator
• bank_gain_mode4_vegas_dcr, converter rack balancing running from targets of -15dB to -27dB (may not always hit target). Three tracks per atten setting
• Scans 2 - 16

X-band, Mode 4, low cal

• get just 3 samples on low noise cal for Dave, -15,-18,-21dB
• scans 17 - 19

X-band, Mode 1, high cal

• edit bank_gain_mode1_vegas_dcr - Mode 1, high cal, target levels -15dB to -27dB, three tracks on each.
• scans 20 - 34

L-band, Mode 1, high cal

• Mode 1, high cal, target levels -15dB to -27dB, three tracks on each.
• scans 35 - 49

L-band, Mode 4, high cal

• Mode 4, high cal, target levels -15dB to -27dB, three tracks on each.
• scans 50 - 64

Noise source into input of ADCs - Mode 1 / 4

• Goal is to see whether effects move as we change which cables are connected to which VEGAS input.
• DCR is not relevant here.
• bank_gain_mode1_cband_nocal
• archivist
• Randy hooks up noise source (cables are not labelled). 0dB attenuation corresponds to ~ -15dBFS
• Scans 65 - 69 = attenuator 0 - 12 dB

• bank_gain_mode4_cband_nocal
• setValues with 5.664 * 2**24 /(2 * sqrt2)
• Scans 70 - VEGAS dies with invalid data error
• Scans 71 - 75, 0 - 12dB

Noise source into input of ADCs - Mode 1 / 4 - Noise source inputs swapped

• recable E1 -> G1, E2 -> G2, F1 -> H1, F2 -> H2
• Still in mode 4
• Scans 76 - 80, 0 - 12 dB
• 2:30pm - finito!