In 91998 I showed a timeline of the satamp whitening swaps. I forgot to think about the fact that on the satamp chassis, there is a physical switch that must also be switched to Whitening ON (for self-explanatory reasons). There are also switches to turn the sum current feedback ON for each QOSEM channel. I've made a(nother) little timeline table.
| = changed at that time | |||||
| Date | Whitening Filter Name | Whitening Filter | Whitening | Sum Feedback | alog |
| Before 2026/07/13 | OG / 1st configuration | zpk([720e-6],[145e-3],1,"n") | OFF | OFF | -- |
| 2026/07/13 | 1st modification / 2nd configuration | zpk([0.0144],[2.89],1,"n") | OFF | OFF | 91003 |
| 2026/07/15 | OFF | ON | 91056 | ||
| 2026/07/22 | ON | ON | 91193 | ||
| 2026/09/09 | 2nd modification / 3rd configuration | zpk([0.263],[2.89],1) | ON | ON | 91853 |
Whitening status disappointments
The entire time that we had the 'Original' satamp whitening configuration, we had the whitening switch OFF. We then swapped the analog whitening to the first modification on July 13 (91003), but we still were not able to turn the whitening ON until probably July 15th at the earliest* (I didn't actually turn it on until July 22nd, but that doesn't matter any since we had already made the first set of mods). This means that we can't make a comparison of the BBSS M1 DAMP IN1 noise for the original whitening filter to compare to the other two later filter configurations. We can't start actually comparing data until after July 22. After this is when we had the whitening ON, Current Feedback ON, and were in our second configuration until early Spetember when we modified the satamp further.
* We had been advised that we keep the whitening OFF until we were in a much quieter state. That could've been late in the day on July 15th, when we were in partial vacuum and had the ISI in a nominal quiet state