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Message ID: 10096     Entry time: Wed Jun 25 01:18:24 2014
Author: Akhil 
Type: Update 
Category: elog 
Subject: Weekly Update 

 Plans for the Week:

  • Phase and noise characterization of the UFC RF Frequency Counter.
  •  Characterization of the temperature actuator.

Progress and Problems Faced:

  • Since past two days, I have been trying to measure the phase difference between the input and output signals of the FC using a 16 bit ADC ADS1115 (for input phase measurement) on Raspberry Pi(RPI).For that I have assembled a Circuit on a breadboard( Details will be mentioned in my next eLog). 
  • The interfacing and the codes seem to be alright but the RPI is not able to detect the address of the ADC chip. I will try to debug the issue as soon as possible and try to take data through the Pi so that I can have both delay and noise introduced by the FC.
  • Now since the minimum sampling time of the FC has been brought down to 0.1s, I will test how accurately the FC is writing values every 0.1 s for a modulating input.
  • The output data of the FC will be fitted into the input and the order of accuracy will be presented.Also the gain plots will be plotted at higher frequencies like 50 MHz, 100 MHz, 500 MHz and 1000 MHz using the network analyzer.

Work Inside the Lab:

  • On Friday Morning I will  go inside the  lab with Manasa to make measurements from the NPRO to characterize its response to the temperature.
  • I will be in the lab in the morning session(9 am- 1 pm) and make the required measurements. I will then analyze the data and by the end of the week will finish characterization of the FC and temperature actuator.
  • For the rest of the time in this week, I'll be on my desk and will not be entering  the lab.

Electronics Required:

  • I will require the network analyzer on Wednesday and Thursday to make measurements at higher frequencies(30 MHz <F<1000 MHz) from the R PI.

Goal- By the end of the week:

  • To characterize both the FC and the NPRO that would go into the FOL-PID loop.
  • The FC will be ready to replace the network analyzers that are currently being used in the 40m.

 

 

 

 

 

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