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Entry  Wed Nov 2 10:41:47 2011, steve, Update, General, 2 spare heliax at the LSC rack 
    Reply  Wed Nov 2 19:32:20 2011, kiwamu, Update, LSC, POP22/110 installed 
       Reply  Thu Nov 3 14:25:52 2011, kiwamu, Update, LSC, PDA10A as POP22/110 : too small signal 
          Reply  Thu Nov 3 16:31:47 2011, kiwamu, Update, LSC, PDA10CF as POP22/110 : better 
Message ID: 5796     Entry time: Thu Nov 3 16:31:47 2011     In reply to: 5794
Author: kiwamu 
Type: Update 
Category: LSC 
Subject: PDA10CF as POP22/110 : better 

The POP22/110 RFPD has been replaced by PDA10CF. As a result the 22 and 110 MHz signals became detectable.

However the signal level maybe too low according to a quick look with an RF spectrum analyzer.

The level at 22 and 110 MHz were both approximately -70 dBm although these values were measured when the central part was freely swinging.

Perhaps we need to amplify the signals depending on the actual SNR.

 

 Also I have updated the optical tables' wiki page :

http://blue.ligo-wa.caltech.edu:8000/40m/Optical_Tables

Quote from #5794

I will replace it by PDA10CF, which is made from InGaAs and supposed to have 10 times bigger responsibility.

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