Filters

RF Filters

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    • 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.
    • 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
    • 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 Filters
      Experience of band filters, for a contest multi operator enviroenment
    • Band-Pass Filters for HF Transceivers
      Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
    • 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.
    • Easy bandpass filters
      Quick and easy bandpass filters for receiver input by George Dobbs G3RJV
    • 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
    • KI5YN QLF Filter
      The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
    • SSB and CW Filter
      A pdf file with schematics of an ssb and cw filter AF amplifier
    • 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.
    • 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.
    • LC Filter Design
      This is an interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).
    • Audio CW Filter
      A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
    • Design RF Filter
    • Coaxial Stub Filters
      A range of easy-to-build RFI filters by John Regnault, G4SWX
    • Interactive Digital Filter Design - This is an interactive filter design package, for designing digital filters
      [ Hits: 843 | Votes: 3 | Rating: 6.67 ]
    • 1.5KW 6m Low Pass Filter - This filter is designed to follow a FULL legal limit, GS-35B, 6m linear amplifier. Designed and built by Bill Jones, K8CU
      [ Hits: 902 | Votes: 4 | Rating: 5.50 ]
    • 144MHz Low-Pass / 432 MHz Notch Filter - A combined 144MHz Low-Pass and 432 MHz Notch Filter by VE2ZAZ
      [ Hits: 445 | Votes: 2 | Rating: 1.50 ]
    • 23 cm filters - 2 filter designs a 3-pole and a 5-pole
      [ Hits: 263 | Votes: 1 | Rating: 1.00 ]
    • 30 Meter Band Pass Filter - A homemade band pass filter for the 30 meter band based on the original VE7BPO design
      [ Hits: 229 | Votes: 0 | Rating: 0.00 ]
    • 432 144 MHz Notch Filter - Combined 432 MHz High-Pass - 144 MHz Notch Filter By Bertrand Zauhar, VE2ZAZ
      [ Hits: 348 | Votes: 1 | Rating: 1.00 ]
    • 440Mhz Interdigital Bandpass Filter - Homebrew Amateur Radio 440Mhz Interdigital Bandpass Filter
      [ Hits: 401 | Votes: 1 | Rating: 1.00 ]
    • 50 MHz Terminating Low Pass Filter - This low pass filter terminates all harmonics from the 2nd to above the 10th harmonic in a better than 15 db return loss load
      [ Hits: 351 | Votes: 0 | Rating: 0.00 ]
    • 500 KHz Low Pass Filter - This article describes a shielded low pass filter with a cut off frequency of about 500 KHz. It is built with components suitable for receiving, and was designed to use in front of a low frequency receiver for LOWFER work.
      [ Hits: 1086 | Votes: 8 | Rating: 3.00 ]
    • 5th order High Pass VHF Filter - Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem
      [ Hits: 1019 | Votes: 7 | Rating: 5.57 ]
    • 70 MHz low pass filter - An home made low pass filter for 70 MHz by IK0VAQ
      [ Hits: 422 | Votes: 1 | Rating: 6.00 ]
    • 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
      [ Hits: 1785 | Votes: 1 | Rating: 10.00 ]
    • A home-built low-pass filter for 4m - This unit uses four capacitors, only two of which are variables, and a single tapped coil. It is built in a die-cast box, and has been tested up to 80W input power on 70MHz by G4CJZ
      [ Hits: 309 | Votes: 0 | Rating: 0.00 ]
    • 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.
      [ Hits: 5095 | Votes: 19 | Rating: 6.11 ]
    • About Cavity Filters - Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass
      [ Hits: 318 | Votes: 3 | Rating: 5.33 ]
    • Audio CW Filter - A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
      [ Hits: 1235 | Votes: 3 | Rating: 5.67 ]
    • Band Filters - Experience of band filters, for a contest multi operator enviroenment
      [ Hits: 3689 | Votes: 5 | Rating: 7.60 ]
    • Band filters by PA9M - Band filters for PA6Z made by PA9M, designed by W3NQN.
      [ Hits: 325 | Votes: 1 | Rating: 9.00 ]
    • Band-Pass Filters for HF Transceivers - Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
      [ Hits: 3375 | Votes: 2 | Rating: 9.00 ]
    • Band-stop filter - Wikipedia page on Notch filter, a narrow stopband - high Q factor filter
      [ Hits: 263 | Votes: 2 | Rating: 2.50 ]
    • Bandpass and I.F. Filters - On this page a popcorn highpass filter, some inductors and their Q , double tuned bandpass filters and simple Cohn Crystal ladder IF filters are presented.
      [ Hits: 759 | Votes: 0 | Rating: 0.00 ]
    • Bandpass filter - A simple project for an effective home made band pass filter, designed for the portable field day usage
      [ Hits: 361 | Votes: 1 | Rating: 8.00 ]
    • Bandpass filters design - How to design narrowband bandpass filters
      [ Hits: 564 | Votes: 4 | Rating: 2.00 ]
    • Bandpass Filters for Portable Usage - These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.
      [ Hits: 361 | Votes: 0 | Rating: 0.00 ]
    • Cheap Crystal Filter - An economical way of building an SSB filter. The circuit is for a filter with a 6 DB band width of roughly 2.2 KHz.
      [ Hits: 347 | Votes: 0 | Rating: 0.00 ]
    • 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!
      [ Hits: 2868 | Votes: 0 | Rating: 0.00 ]
    • 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!
      [ Hits: 1110 | Votes: 0 | Rating: 0.00 ]
    • Coax Stubs and Band Pass Filters - Will additional coax stubs improve Band Pass Filter performance?
      [ Hits: 359 | Votes: 1 | Rating: 2.00 ]
    • Coaxial Stub Filters - Coaxial stub filters used at W7GJ
      [ Hits: 976 | Votes: 0 | Rating: 0.00 ]
    • Coaxial Stub Filters - A range of easy-to-build RFI filters by John Regnault, G4SWX
      [ Hits: 1133 | Votes: 4 | Rating: 9.25 ]
    • Constant k Lowpass Filter Design - Online Constant - k Lowpass Filter calculator
      [ Hits: 327 | Votes: 12 | Rating: 3.67 ]
    • Contest Bandpass Filters - Build a set of W3NQN filters for multi-operator contesting
      [ Hits: 312 | Votes: 0 | Rating: 0.00 ]
    • Curing Alternator Whine - How to create a low pass filter able to reduce or even remove the noise generated from your car or truck alternator
      [ Hits: 309 | Votes: 1 | Rating: 8.00 ]
    • CW Filter Kit - Building the W3NQN CW Filter Kit Step by Step by AK3W
      [ Hits: 307 | Votes: 0 | Rating: 0.00 ]
    • CW Notch Filter - Homebrew CW notch filter project by KN9B
      [ Hits: 354 | Votes: 0 | Rating: 0.00 ]
    • Design RF Filter
      [ Hits: 1201 | Votes: 2 | Rating: 4.50 ]
    • Easy bandpass filters - Quick and easy bandpass filters for receiver input by George Dobbs G3RJV
      [ Hits: 1914 | Votes: 1 | Rating: 9.00 ]
    • Filtering of the Icom IC-775 DSP - Replacing filters on ICOM IC 775
      [ Hits: 343 | Votes: 5 | Rating: 6.40 ]
    • Filters and Ferrites in EMC - This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.
      [ Hits: 775 | Votes: 0 | Rating: 0.00 ]
    • Filters for NDB reception - RF Filters to help with NDB reception problems
      [ Hits: 987 | Votes: 1 | Rating: 10.00 ]
    • High Pass Filters - Understand how high pass filters are done
      [ Hits: 499 | Votes: 0 | Rating: 0.00 ]
    • High-Pass Filter Design - Online high pass filter design page with introduction to high-pass filters by K7MEM
      [ Hits: 528 | Votes: 2 | Rating: 1.00 ]
    • Highpass filter calculator - Butterworth Highpass Filter Designer
      [ Hits: 268 | Votes: 4 | Rating: 2.75 ]
    • 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.
      [ Hits: 1578 | Votes: 2 | Rating: 2.50 ]
    • Homebrew Crystal Filter Design - Desgining crystal filters and find out crystal data by measuring it.
      [ Hits: 476 | Votes: 7 | Rating: 7.00 ]

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