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The first few seconds shows before the ferrite, and the last few seconds shows after the ferrite. By simply placing a ferrite on the wire directly soldered to the RTL2832 chip, broadcast FM interference can be filtered out when in direct sampling mode for HF. The ferrite acts as a simple low pass filter. Removing the coupling capacitors between the RTL2832 and E4000 chips is reported to help as well, but I saw a negligible difference in performance with the capacitors removed. RTL SDR i
