Summary of Demodulation Boards

• Name	S/N	Rev.	LPF	Splitter	Amp. Imbalance [dB]	Phase difference [deg]	conversion efficiency [Vout/VPD]	Notes
  AS11	121		SCLF-10.7	PSCQ-2-51W			I=0.19, Q=0.20	Sacrificed to create AS110
  REFL11	021		SCLF-10.7	PSCQ-2-51W			I=4.74, Q=5.04	w/ amp board
  POY11	119		SCLF-10.7	PSCQ-2-32			I=0.21, Q=0.18
  POX11			SCLF-10.7	PSCQ-2-51W			I=0.17, Q=0.16
  POP11			SCLF-10.7					does this exist ?
  POP22	020		SCLF-21.4	PSCQ-2-32			I=0.30, Q=0.24
  REFL33			SCLF-33+				I=0.42, Q=0.42
  AS55	029		SCLF-65	PSCQ-2-51W			I=6.77, Q=6.77	w/ amp board
  REFL55	118		SCLF-65	PQW-2-90			I=0.36, Q=0.35
  POP55			SCLF-65+	-			I=6.57 Q=6.48	w/ amp board
  AS110	formerly AS11		SXBP-100 (Sept2013)
  POP110	120		SXBP-100 (Sept2013)	PSCQ-2-120			I=0.28, Q=0.27
  REFL165			SCLF-190				I=0.34, Q=0.34
  AS165			SCLF-190					does this exist ?
  POP165			SCLF-190					does this exist ?

References

• [1] Ordering Low pass filters 40m elog #4459 (Mar/2011)

• [2] Low pass filters and the old name convention 40m elog #4511 (Apr/2011)

• [3] Power splitter Upgrade 40m elog #4538 (Apr/2011)

• [4] How to replace the splitter 40m elog #4554 (Apr/2011)

• [5] Replacement of the splitters 40m elog #4698 (May/2011)

• [6] Replacement of the splitters part II 40m elog #4714 (May/2011)

• [7] I/Q imbalance tests 40m elog #4736 (May/2011)

• [8] 1Y2 rack pictures Electronics/1Y2

• [9] Circuit schematic LIGO D990511-x0

• [10] Measurement of the coversion efficiencies 40m elog #6402 (Mar/2012)

Board Arrangement on 1Y2 Rack

Diagram needs to be updated !

• The latest version is available on the 40m svn:

• https://nodus.ligo.caltech.edu:30889/svn/trunk/suresh/40m_RF_upgrade/1Y2%20Rack%20Layout.pdf

  

Upgrading of Demodulation Boards

We are currently at the intermediate state

Links

• Whitening filters for the LSC demod signals