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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.
    • 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
    • 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
    • TVI and BCI Filters - TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.
    • Band Filters - Experience of band filters, for a contest multi operator enviroenment
    • 1.8-54 Mhz Low pass filter - An easy to make HF low pass filter form high power by k8cu
    • Band-Pass Filters for HF Transceivers - Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
    • K2TR Coax Stub Filters - Multi transmitter filters
    • 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 donít!
    • KI5YN QLF Filter - The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
    • 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
    • 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.
    • 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.
    Alphabetical
        Result Page:  1 2 [>>]
    • Interactive Digital Filter Design - This is an interactive filter design package, for designing digital filters
      [ Hits: 732 | 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: 724 | Votes: 4 | Rating: 5.50 ]
    • 1.8-54 Mhz Low pass filter - An easy to make HF low pass filter form high power by k8cu
      [ Hits: 3186 | Votes: 2 | Rating: 2.00 ]
    • 144MHz Low-Pass / 432 MHz Notch Filter - A combined 144MHz Low-Pass and 432 MHz Notch Filter by VE2ZAZ
      [ Hits: 75 | Votes: 1 | Rating: 2.00 ]
    • 23 cm filters - 2 filter designs a 3-pole and a 5-pole
      [ Hits: 174 | Votes: 1 | Rating: 1.00 ]
    • 432 144 MHz Notch Filter - Combined 432 MHz High-Pass - 144 MHz Notch Filter By Bertrand Zauhar, VE2ZAZ
      [ Hits: 63 | Votes: 0 | Rating: 0.00 ]
    • 440Mhz Interdigital Bandpass Filter - Homebrew Amateur Radio 440Mhz Interdigital Bandpass Filter
      [ Hits: 179 | 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: 81 | 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: 877 | Votes: 7 | Rating: 2.71 ]
    • 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: 901 | Votes: 7 | Rating: 5.57 ]
    • 70 MHz low pass filter - An home made low pass filter for 70 MHz by IK0VAQ
      [ Hits: 106 | 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: 1340 | 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: 105 | Votes: 0 | Rating: 0.00 ]
    • A low pass filter circuit  updated - 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: 4349 | Votes: 17 | Rating: 5.94 ]
    • About Cavity Filters - Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass
      [ Hits: 216 | Votes: 0 | Rating: 0.00 ]
    • Audio CW Filter - A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
      [ Hits: 1026 | Votes: 3 | Rating: 5.67 ]
    • Band Filters - Experience of band filters, for a contest multi operator enviroenment
      [ Hits: 3430 | Votes: 5 | Rating: 7.60 ]
    • Band filters by PA9M - Band filters for PA6Z made by PA9M, designed by W3NQN.
      [ Hits: 238 | 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: 2880 | Votes: 2 | Rating: 9.00 ]
    • Band-stop filter - Wikipedia page on Notch filter, a narrow stopband - high Q factor filter
      [ Hits: 162 | 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: 655 | Votes: 0 | Rating: 0.00 ]
    • Bandpass filters design - How to design narrowband bandpass filters
      [ Hits: 324 | 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: 260 | 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: 236 | 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 donít!
      [ Hits: 2409 | Votes: 0 | Rating: 0.00 ]
    • Clean Up Your Signals with Band-Pass Filters part 2 - Part 2óYouíre now much closer to saying goodbye to your unwanted signal problems!
      [ Hits: 959 | Votes: 0 | Rating: 0.00 ]
    • Coaxial Stub Filters - Coaxial stub filters used at W7GJ
      [ Hits: 810 | Votes: 0 | Rating: 0.00 ]
    • Coaxial Stub Filters - A range of easy-to-build RFI filters by John Regnault, G4SWX
      [ Hits: 1011 | Votes: 3 | Rating: 9.00 ]
    • Constant k Lowpass Filter Design - Online Constant - k Lowpass Filter calculator
      [ Hits: 218 | Votes: 10 | Rating: 3.20 ]
    • CW Filter Kit - Building the W3NQN CW Filter Kit Step by Step by AK3W
      [ Hits: 141 | Votes: 0 | Rating: 0.00 ]
    • Design RF Filter
      [ Hits: 1031 | Votes: 1 | Rating: 5.00 ]
    • Easy bandpass filters - Quick and easy bandpass filters for receiver input by George Dobbs G3RJV
      [ Hits: 1566 | Votes: 0 | Rating: 0.00 ]
    • Filtering of the Icom IC-775 DSP - Replacing filters on ICOM IC 775
      [ Hits: 194 | Votes: 1 | Rating: 1.00 ]
    • 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: 720 | Votes: 0 | Rating: 0.00 ]
    • Filters for NDB reception - RF Filters to help with NDB reception problems
      [ Hits: 974 | Votes: 1 | Rating: 10.00 ]
    • High Pass Filters - Understand how high pass filters are done
      [ Hits: 445 | Votes: 0 | Rating: 0.00 ]
    • High-Pass Filter Design - Online high pass filter design page with introduction to high-pass filters by K7MEM
      [ Hits: 459 | Votes: 2 | Rating: 1.00 ]
    • Highpass filter calculator  updated - Butterworth Highpass Filter Designer
      [ Hits: 164 | 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: 1352 | Votes: 1 | Rating: 4.00 ]
    • Homebrew Crystal Filter Design - Desgining crystal filters and find out crystal data by measuring it.
      [ Hits: 270 | Votes: 2 | Rating: 8.50 ]
    • Inrad Roofing Filter in the Yaesu FT-920 - Insalling Inrad roofing filter in the FT-920 with pictures and comments
      [ Hits: 578 | Votes: 2 | Rating: 9.50 ]
    • Interdigital bandpass filter designer - Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength
      [ Hits: 795 | Votes: 5 | Rating: 8.20 ]
    • Interferences and filtering - General information on Filter passbands, interferences, TVI and RFI problems
      [ Hits: 1003 | Votes: 1 | Rating: 10.00 ]
    • K2TR Coax Stub Filters - Multi transmitter filters
      [ Hits: 2476 | Votes: 6 | Rating: 6.33 ]
    • K3NA stub design
      [ Hits: 502 | Votes: 0 | Rating: 0.00 ]
      Result Page:  1 2 [>>]
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