RF Filter Resources

Curated RF filter technical resources

RF Filter Resources serve as a curated gateway to community-driven technical manuals, guides, and external links related to RF filters. Explore resources on interference suppression, band-pass filters, low pass filters, and filter design crucial for ham radio operators.
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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
    The page provides detailed information on coax stub filters for multi-transmitter setups, including specific lengths for different bands and types of coax. It also references additional technical notes for further analysis.
  • 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. This is a 6-band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands. Stop band reject may be limited by the relay isolation. Worse case isolation is at 28 MHz or 35 dB or better. Relay K3/K8 protects the filter during transmit via the PTT line. A 25-50ms delay must be used between transmit and PTT. Do not rely on your radio to provide adequate delay with out using the PTT. You logging software must be set to allow a delay between PTT and time of 1st transmit. This filter will not work with VOX or QSK keying as you will damage the filter.
  • 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
    The document is a technical guide on designing RF filters for radio frequency applications. It covers topics such as interference suppression, band-pass filters, and low pass filters, with a focus on filter design and circuit filters.
  • 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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