daniel.sigg@LIGO.ORG - posted 11:46, Tuesday 05 March 2019 - last comment - 17:36, Wednesday 06 March 2019(47296)
100MHz high pass filter in SQZ TTFSS
Nutsinee Daniel
With the discovery that the noise eater can add noise to the beat note between the PSL and SQZ lasers (LLO alog 43837), we added a 100MHz high pass filter to the spare TTFSS (S1700330).
On the PFD D1002471 we changed:
- R1 was removed
- F1 was stuffed with a Mini-Circuits PHP-100+
This unit was installed and the old unit removed (S1700331). We also removed the IQ demod version of the TTFSS that was still on top ISCT6.
Noticed that the fan of the laser power supply starting to sound like a coffee grinder...
Daniel, Nutsinee
Board S1700330 is back in the shop. We suspect broken boost3. Currently using S1700331.