As suggested, I wrapped the satellite amplifier box D10028128 S2100029 in blanket and foam and took very low frequency spectrum starting from 32 mHz to 3 Hz. The results are attached along with stiched high frequency measurements from 40m/15793.

Very Low Frequency Spectrum Measurement

• D1002818 S2100029 box was powered and covered in a foam blanket.
• Additionally, it was covered from all sides with foam to reduce wind and temperature effects on it.
• The rear panel DB25 connector was connected to a breakout board where pins od PDA input and GND were shorted, shorting the transimpedance circuit input.
• The output was read from PDMon DB9 output at front panel which was converted to 4 BNC channels using breakout board.
• Two channel noise was measured at once using D1002818_SP.yml parameter file.
• Instrument noise at all the used input ranges were measured separately by shorting the input of the BNC cables.

Edit Wed Feb 10 15:14:13 2021 :

THIS MEASUREMENT WAS WRONG. SEE 40m/15799.