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Entry  Wed May 18 07:13:00 2011, Suresh, Update, RF System, Demod board measurements Demod_Board_measurements.pngDemod_Board_measurements.png
    Reply  Fri May 20 05:41:22 2011, Suresh, Update, RF System, Demod board measurements 
Message ID: 4736     Entry time: Wed May 18 07:13:00 2011     Reply to this: 4755
Author: Suresh 
Type: Update 
Category: RF System 
Subject: Demod board measurements 

I measured the amplitude and phase imbalances of the demod boards which have been modified.  This is just a basic health check.  We hope to use the script that Kiwamu is developing for a more accurate test.  The script can also use these measurements as a sanity check.  POP110  requires some further attention. 



The RF distribution box outputs corresponding to the demod board (eg. AS55_LO --> AS55_demod) were used as LO sources.  The RF signal was generated with a Marconi and held a kHz away from the LO frequency.  The amplitude and phase unbalance were measured with SR785.  The RF Power meter was used to check the LO power in each case.



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