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Entry  Mon Jul 8 21:46:31 2013, manasa, Update, Green Locking, Beatbox 
    Reply  Wed Jul 10 02:10:41 2013, manasa, Update, Green Locking, Beatbox gets a makeover IMG_0842.JPGIMG_0844.JPGIMG_0845.JPGIMG_0846.JPG
Message ID: 8807     Entry time: Mon Jul 8 21:46:31 2013     Reply to this: 8818
Author: manasa 
Type: Update 
Category: Green Locking 
Subject: Beatbox 

[Koji, Manasa]

I wanted to investigate on the ALS electronics(in particular the beatbox and the phase tracker) and find out if the beatbox is showing a linear behavior
as we expect it to and as to why we have been seeing sudden jumps at the phase tracker output.

I have been using the Xarm part of the beabox.
I used Marconi as well as signal generator to do frequency sweep/modulation at the RF input of the beatbox and looked at the I_MON output of the beatbox.

We observed sudden jumps in the beatbox output from time to time while we either varied the carrier frequency or the RF amplitude.
Also the beatbox output shows high frequency oscillations at ~95MHz (source unknown). It is for sure that the beatbox is not behaving the way it should
but we could not tell more or troubleshoot with the beatbox mounted on the rack.

I am going to let Annalisa do her Y arm ALS scan tonight and pull out the beatbox tomorrow to fix it.

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