EarToEarOak/RTLSDR-Scanner

Noise source response

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Im using a noise source which should go up to 1.5GHz without any problems. But by doing some tests in my frequency of interest, the response of the dongle/software is really strange. Instead of having a flat response, I have a drop of more than 5db/Hz on 100MHz interval and around 1 on 10MHz interval (140 - 150 MHz). Maybe Im do it wrong, but the response should be flat. Also, scanning without anything attached gives a nice (almost) straight line. Please see the attachments for noise source response.
scan 140 0-150 0mhz noise test

scan 100 0-200 0mhz noise test