J. Kissel

While the BSC-ISIs were in an odd configuration anyway for obtaining sensor correction gain matching data (see LHO aLOG 16200), I took the opportunity to clean up, clean out, and fill in the ST1 and ST2 BLND_NXT filter banks with the correct, high performance, Ryan DeRosa, blend filters. Recall that the CUR (for "current") and NXT (for "next") filter banks should have the same exact filters in all filter modules, such that they can be used for the automatically switching between blend filters on the fly (see T1200126). 

All NXT banks for ETMX, ETMY, ITMX, ITMY, and BS now have identical filters as what's in place in the CUR banks (HAMs are already up-to-snuff). 

Further, I've cleared out all "Unknown", gain-of-one, filters which seemed to have been sporadically peppered in the higher numbered FMs. 

Finally, when transitioning back from the "Start" filters to Ryan's filters (by hand), I've left the RZ filter banks with all FMs OFF, because we don't run the RZ isolation loops.

For the record, I performed the copy and paste by-hand in foton, saved filters via foton, and reloaded all coefficients simultaneously using the GDS_TP screen. Further, I've committed all affected filter files (and any other I found different from the SVN -- the HAM's .txt files because of Jim's recent improvement of the isolation loops [aLOG pending], and HAM4 and 6's .fir files, because Jim installed them Dec 2nd [aLOG "pending"]). 

Also -- I did not have enough time to *test* whether the newly implemented filters allow for smooth switching between the low-noise filter set and any others, but my suspicion is that it *still* won't work, given that the blend switching software cannot handle filter sets that occupy two FMs, which is the case for the RX and RY filters on ST1.