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Entry  Fri Oct 28 04:57:00 2011, kiwamu, Update, LSC, POX11 demod board broken Screen_shot_2011-10-28_at_2.26.02.png
    Reply  Thu Nov 3 18:41:36 2011, kiwamu, Update, LSC, POX11 demod board : haven't been modified yet 
       Reply  Thu Nov 3 19:58:18 2011, kiwamu, Update, LSC, POX11 demod board : modification done POX11demod.png
          Reply  Fri Nov 4 00:13:24 2011, Koji, Update, LSC, XARM locked with POX11 POX11.pdf
Message ID: 5802     Entry time: Thu Nov 3 19:58:18 2011     In reply to: 5801     Reply to this: 5804
Author: kiwamu 
Type: Update 
Category: LSC 
Subject: POX11 demod board : modification done 

The modification on the POX11 demod board has been successfully done.

I followed the procedure which had been posted in a past entry (#4554).

The home-made splitter was replaced by PSCQ-2-51W, which has a relatively wide band of 5 - 50 MHz.

The usual orthogonality adjustment will be done in the daytime.

 

 The attached snapshot was taken when an sinusoidal RF signal with a slight frequency offset from LO was injected to the RF input.

It is clear that the I and Q output show healthy signals (i.e. almost the same amplitude and 90 deg phase difference.)

POX11demod.png

Quote from #5801

I am going to replace the splitter which had been made with a hand-wounded coil because it can work only at a specific tailored frequency.

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