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Entry  Mon Apr 11 19:09:59 2011, Suresh, Update, RF System, Installed low pass filters in the demod boards 
    Reply  Mon Apr 11 23:35:02 2011, rana, Update, RF System, Installed low pass filters in the demod boards 
Message ID: 4511     Entry time: Mon Apr 11 19:09:59 2011     Reply to this: 4514
Author: Suresh 
Type: Update 
Category: RF System 
Subject: Installed low pass filters in the demod boards 

 

As part of the RF system upgrade some of the demod boards in the lab were modfied.  The filter U5 (see the circuit schematic) was replaced. These changes are tabulated below.

 

Filters installed in the demod boards
Serial number Old name of the card New name of the card Filter installed Remarks
107 POY33 REFL33 SCLF-33+ R14=50Ohm
118 AP133, ASDD133 REFL55 SCLF-65  
114 PO199 REFL165 SCLF-190 R14=50Ohm
120 PO133 POP110 SCLF-135  
123 SP133 POP55 SCLF-65+ AT1 removed, R14=50Ohm
122 SP199, REFLDD199 AS165 SCLF-190  
121 SP166, REFL16 POP11 SCLF-10.7  
116 AP199 199 MHz POP165 SCLF-190  
126 AS166 33.3 MHz POX11 SCLF-10.7  
119 POX 33.3 MHz POY11 SCLF-10.7  
021 24.5 MHz (LLO) REFL11 SCLF-10.7  
020 24.5 MHz SCLF-45 POP22 SCLF-21.4  
022 24.5 MHz SCLF-45 AS11 with amp SCLF-10.7  
029 24.5          SCLF-f5 AS55 with amp SCLF-65  

 

Next, I and Q phase has to be checked for orthogonality. And noise levels of the cards have to measured.

 

 

 

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