may18 puppi polB comb

02may18



links to sections
the problem
setup
processing

21apr18 polN comb and polA standing wave:
30apr18 polB comb



The problem:

    P3054 (coherent search) data taken 21apr18 and 30apr18 showed an 8 channel comb in polB. It was present in  cband data (which uses the new puppi mixer) and in lband data (which does not use the new puppi mixer). The comb sits in the same frequency channels in both lband and cband


p3054 Experiment setup:

Puppi setup:

Receiver setup:

30apr18: p3054 cband data

    cband coherent search data was taken on 30apr18. This was after the IF cables to puppi were tightened.

I looked at the file:

Average spectra, acf

The first set of plots show the spectra averaged over each file (.ps) (.pdf)

Dynamic spectra from .3 sec averaged spectra

Dynamic spectra for Cband data (.png)

Total power vs time    

The average power in each gpu band was computed (at the .3 second row time resolution) and then plotted vs time.
    
gpu power vs time (.ps) (.pdf)

rms/mean for a .3 second row.

    The first record of the file was used to compute the rms/mean by freq channel (.ps) (.pdf)

Summary:

processing: x101/180430/p3054rfi.pro


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