Noise Reduction

RFI, Noise Reduction Resources

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  • Antenna Noise and Signal Cancelling at LF
    By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.
  • Using ferrite for interference suppression
    Excellent guide to using ferrite cores for interference suppression. Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
  • QRM and noise reduction
    You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array. Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM
  • Automotive RFI elimination
    ARRL pdf file on how remove car noise from your radio. Modern vehicles are RF noisy environments. Come learn how to identify and silence yor mobile noise sources, by WA6PDP
  • Common-Mode Noise
    Receiving Common Mode Noise shows how lack of a balun can contribute to system noise
  • How to make a mains filter for EMC and noise reduction
    Article showing how I've made a mains filter to reduce EMC in the electricity supplying my shack. I've used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m.
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    • Related Categories

  • Baluns
  • Antenna Design Theory
  • Filters
  • Lightning
  • Chokes