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Entry  Mon Jun 4 22:38:44 2012, tara, DailyProgress, BEAT, low frequency beat with 32kHz ADC beat_2012_06_04_b.pngdemod.png
    Reply  Tue Jun 5 23:30:47 2012, rana, DailyProgress, BEAT, low frequency beat with 32kHz ADC 
       Reply  Tue Jun 19 00:08:19 2012, tara, DailyProgress, BEAT, low frequency beat with 32kHz ADC 
          Reply  Wed Jun 20 16:06:50 2012, tara, DailyProgress, BEAT, low frequency beat with 32kHz ADC 
             Reply  Wed Jun 20 17:50:59 2012, rana, DailyProgress, BEAT, low frequency beat with 32kHz ADC 
                Reply  Thu Jun 21 16:04:39 2012, tara, DailyProgress, BEAT, low frequency beat with 32kHz ADC demod_2012_06_21.mat
                   Reply  Fri Aug 10 19:50:37 2012, tara, DailyProgress, BEAT, code schmidtt trigger for beat  schmidtt.pngzoom.pngschmidtt.zip
                      Reply  Thu Aug 30 02:52:01 2012, tara, DailyProgress, BEAT, code schmidtt trigger for beat  IQ_2012_08_20.png
                         Reply  Fri Aug 31 00:48:00 2012, tara, DailyProgress, BEAT, code schmidtt trigger for beat  compare_IQ_schmidtt.pngcompare_IQ_schmidtt.figIQ_compare.pngIQ_compare.figvco-frequency-noise_2010-03-12.png
                            Reply  Mon Sep 3 01:02:46 2012, tara, DailyProgress, BEAT, code schmidtt trigger for beat  IQ_compare.pngIQ_compare.fig
Message ID: 1041     Entry time: Thu Aug 30 02:52:01 2012     In reply to: 1039     Reply to this: 1042
Author: tara 
Type: DailyProgress 
Category: BEAT 
Subject: code schmidtt trigger for beat  

I'm trying to check if the schmidtt trigger algorithm will work as our beat readout or not (observe beat from dc to 1kHz), I also revisit IQ readout technique that we tried before as well. I'm analyzing the data and found that some data was not taken carefully (from chosen the wrong time). Here I'll just explain my plan and setup:

Objective: Check if readout methods (Schmidtt PSL:xxx, IQ PSL:xxx readout) are suitable for beat measurement or not. Do they provide a valid result?,

Method:  Compare the result obtained from the mentioned method with a reliable result. My plan is to use PLL to measure the frequency noise of a Marconi at various setup and use it as our reliable result. The setup is similar to what I did in PSL:Xxx, but I did not use 10MHz standard frequency input for Marconi.

   Setup 1: simple demodulated signal.  [add fig] . Both marconis' carrier frequencies were ~ 160MHz. Then the two signals were demodulated down to 1kHz and sent to DAQ (@32kHz). Three levels of frequency deviation (10kHz, 1kHz, 100Hz) were set on Marconi. The data will be used for testing Schmidtt trigger technique

 

IQ_2012_08_20.png

fig2: setup for measurement 2 and 3.

   Setup2:  IQ technique.  With this setup, I measured I-Q signals with three different setting The signals were also demodulated to 1kHz and the frequency deviation were chosen to three levels (10kHz, 1kHz, 100Hz)as well.

  Setup3:  This setup was similar to that of setup 2, but the setting was different. I kept the frequency deviation at 100kHz, and varied the demodulated frequency instead. I chose 1 kHz, 3kHz, and 9 kHz. This data will be used for checking if our beat frequency drift around 9 kHz, will the read out still ok or not.

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