RF Filter

RF Filters

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  • 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
  • A low pass filter circuit
    A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.
  • Tunekit
    Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter
  • Band-Pass Filters for HF Transceivers
    Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
  • Band Filters
    Experience of band filters, for a contest multi operator enviroenment
  • Clean Up Your Signals with Band-Pass Filters
    These inexpensive, easily built filters can be the buffer you need between the signals you want to hear and send and those you don't!
  • K2TR Coax Stub Filters
    Multi transmitter filters
  • Narrow Band-Pass filter for HF
    Band-pass filters can be critical components in competitive stations. This setup may help put your station on the map.
  • A diode-switched band-pass filter
    High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB
  • SSB and CW Filter
    A pdf file with schematics of an ssb and cw filter AF amplifier
  • YCCC 6 Band Receive Bandpass filter
    This is a 6 band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands.
  • KI5YN QLF Filter
    The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
  • Homebrew a CW Filter
    An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french.
  • LC Filter Design
    This is an interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).
  • Design RF Filter
  • Audio CW Filter
    A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
  • Clean Up Your Signals with Band-Pass Filters part 2
    Part 2 You're now much closer to saying goodbye to your unwanted signal problems!
  • Coaxial Stub Filters
    A range of easy-to-build RFI filters by John Regnault, G4SWX
  • 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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  • Circuit Design Software
  • Filter Design Software
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  • Radio Noise
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