First appearance 2021.12.02, shows in most observations at least through 2021.12.08. AC, not BD.
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this is the first one I think it shows up in, in which case A0C0 is flagged completely early on:
L band (A0C0/B0D0 overlap in 1-2 GHz)
20A-346.sb40945586.eb40991931.59550.23195141203
/lustre/aoc/cluster/pipeline/dsoc-prod/qa2/20A-346_2021_12_02_T09_49_21.649/
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Here's an example where it shows in L band but not S or C. Bandpass looks ok then it splits during phase/target:
21B-300.sb40118665.eb41018082.59552.024224479166
/lustre/aoc/cluster/pipeline/dsoc-prod/spool/21B-300_2021_12_04_T02_25_15.642/
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Here's an X band SRDP where it shows in amp but not phase. A2C2 is flagged early on, A1C1 remains:
20B-377.sb40988044.eb40995622.59550.52704597222
/lustre/aoc/sciops/estarr/data/20B-377_2021_12_02_T13_49_13.876/
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S band:
21B-057.sb40230716.eb41018116.59554.50380155093
/lustre/aoc/cluster/pipeline/dsoc-prod/qa2/21B-057_2021_12_06_T15_49_21.868/
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this SB uses A0C0 only:
21B-058.sb40063604.eb41018118.59554.65131861111
/lustre/aoc/cluster/pipeline/dsoc-prod/qa2/21B-058_2021_12_06_T17_49_15.271/
