Jeff, Rana, Alexa, Kiwamu, Evan

Rana noticed that the BS oplev spectra (pitch and yaw) were suspiciously flat, perhaps indicating that they were dominated by ADC noise.

To fix this, Rana and I attached a DIP-switch jumper board (D1001631v2) to the 37-pin dsub on the BS oplev whitening board. This allows us to set bits that control the gain and whitening.

For each of the four segments, we flipped bits 2 and 4 (which increases the gain) and bit 5 (which engages a single whitening stage) to high; all others are low. Then we engaged the antiwhitening filters for each segment.

The first attachment shows the BS oplev spectra before (green, brown) and after (cyan, magenta) the gain+whitening+antiwhitening, with the loop off. We now appear to be resolving more features in the spectra.

The second attachment shows the BS oplev spectra after gain+whitening+antiwhitening, with the loop off (cyan, magenta) and on (red, blue).