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Message ID: 4622     Entry time: Wed May 4 12:07:48 2011
Author: Suresh 
Type: Update 
Category: RF System 
Subject: REFL55 installed on the AP table 

REFL55 has been installed on the AP table.  REFL11 has been moved to make space for a 50% beam splitter. The reflected beam from this splitter is about 30% of the transmitted beam power.  The reflected beam goes to REFL11 in the current configuration.  The DC levels are 1.2V on REFL 11 and 3.5V on the REFL55.

I redid some of the cabling on the table because the we need to choose the heliax cables such that they end up close to the demod board location.  As per the 1Y2 (LSC) rack layout given here, some of the PD signals have to arrive at the top and others at the bottom of the LSC rack.

Currently the PDs are connected as follows:

 

REFL11 PD --> Heliax (ASDD133) (arriving at the top of LSC rack) --> REFL11 Demod Board 

REFL55 PD --> Heliax (REFL166) (arriving at the top of LSC rack) --> AS55 Demod Board

AS55 PD --> Heliax (AS166) (arriving at the top of the LSC rack) --> not connected.

 

We are waiting for the Minicircuits parts to modify the rest of the demod boards.

 

The heliax cables arriving at the LSC rack are not yet fixed properly.  I hope to get this done with Steve's help today.

 

 

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