* Paul/Vivek: RFI causing compression in C band along line of sight including ends of West and North arm. ea17 TBD. *
2021 B config:
ea06 [N32], ea17 [N36], ea18 [N28], ea22 [N24], ea24 [W36], ea26 [W32]
ea18,ea22,ea24 always exhibit compression, though sometimes mild. ea06,ea17,ea26 occasionally have it.
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ea17 switch, mostly C, maybe others
ea18 C:A2C2
ea22 C:A2C2
ea24 C:A2C2
These issues are all easily seen in finalcals stage of pipeline, "final amp time cal" and "final amp freq cal" tabs.
ea17 solutions look like y = -1/x, ranging from 5.0 to 6.5 GHz (centered at ~5.7), crossing the A1C1 to A2C2 boundary. This can be very pronounced to very minor. There is often general spread in A2C2 on top of that feature.
ea17 is usually seen spiking between 5.0-6.5 GHz in plotsummary amp vs freq as well.
It is possible this affects bands besides C as well, though less frequently. An A band example from Drew is at bottom of page.
ea18, ea22, ea24 less often show issues in plotsummary. ea18 is the worst offender with generalized scatter. ea24 possibly got better for a time, then got bad again.
example pipeline products here:
/lustre/aoc/sciops/estarr/data/C_band_examples/
previews below:
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