Birdies in the pdev device (narrow band)


    Previous data taken with the pdev spectrometer used the "sp1" fpga code and a temporary mixer chassis. The "sp1" code gave 20Khz channel widths (hires is not yet installed) while the mixer chassis  cut out a few hundred Khz about dc.
    On 03jul07 data was taken with the "radar device" that tamara is working on. It uses the pdev spectrometer with fpga code that filters the data and then writes the time samples out to disc. The version used was still in the development stages. This data set allowed us to look at birdies close to dc that may be coming from the switching power supply.
    The setup was:

    The plots show the averaged spectral density (.pdf):


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